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Junlian Huang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of branch ring branch tadpole shaped linear poly e caprolactone b cyclic poly ethylene oxide b linear poly e caprolactone by combination of Glaser Coupling reaction with ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

  • synthesis of twin tail tadpole shaped cyclic polystyrene block linear poly tert butyl acrylate 2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • synthesis of amphiphilic tadpole shaped copolymers by combination of Glaser Coupling with living anionic polymerization and ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The tadpole-shaped copolymers polystyrene (PS)-b- (cyclic poly(ethylene oxide) (PEO)) (PS-b-(c-PEO)) contained lin- ear tail chains of PS and cyclic head chains of PEO were syn- thesized by combination of Glaser Coupling with living anionic polymerization (LAP) and ring-opening polymerization (ROP). First, the functionalized polystyrene-glycerol (PS-Gly) with two active hydroxyl groups at x end was synthesized by LAP of St and the subsequent capping with 1-ethoxyethyl glycidyl ether and then deprotection of protected hydroxyl group in acid condition. Then, using PS-Gly as macroinitiator, the ROP of EO was performed using diphenylmethylpotassium as cocata- lyst for AB2 star-shaped copolymers PS-b-(PEO-OH)2, and the alkyne group was introduced onto PEO arm end for PS-b-(PEO- Alkyne)2. Finally, the intramolecular cyclization was performed by Glaser Coupling reaction in pyridine/Cu(I)Br/N,N,N 0 ,N 00 ,N 00 - pentamethyldiethylenetriamine system under room tempera- ture, and tadpole-shaped PS-b-(c-PEO) was formed. The target copolymers and their intermediates were well characterized by size-exclusion chromatography, proton nuclear magnetic reso- nance spectroscopy, and fourier transform infrared spectros- copy in details. The thermal properties was also determined and compared to investigate the influence of architecture on properties. The results showed that tadpole-shaped copolymers had lower Tm, Tc ,a ndXc than that of their precursors of AB2 star-shaped copolymers. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2227-2235, 2012

  • Synthesis of branch‐ring‐branch tadpole‐shaped [linear‐poly(ε‐caprolactone)]‐b‐[cyclic‐poly(ethylene oxide)]‐b‐ [linear‐poly(ε‐caprolactone)] by combination of Glaser Coupling reaction with ring‐opening polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

  • Synthesis of twin‐tail tadpole‐shaped (cyclic polystyrene)‐ block‐[linear poly (tert‐butyl acrylate)]2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

Guowei Wang - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and characterization of novel barbwire-like graft polymers poly(ethylene oxide)-g-poly(ε-caprolactone)4 by the ‘grafting from’ strategy
    Polymer Chemistry, 2015
    Co-Authors: Xinyi Liang, Yujie Liu, Jian Huang, Liuhe Wei, Guowei Wang
    Abstract:

    Novel barbwire-like graft polymers PEO-g-PCL4 were synthesized by combination of ring opening polymerization (ROP) and Glaser Coupling with thiol–yne addition reaction via the “grafting from” strategy. Typically, the precursor (PEO-diyne-PEO)s of high molecular weight was obtained by Glaser Coupling of alkyne-PEO-alkyne, which was prepared by modification of HO-PEO-OH with propargyl bromide. After the diyne groups on PEO were transferred into hydroxyl groups by efficient thiol–yne addition reaction with mercaptoethanol, the macroinitiator [PEO-(OH)4-PEO]s was obtained and the graft polymers PEO-g-PCL4 were synthesized by ROP of e-caprolactone monomers. The structure of graft polymers was confirmed by GPC, MALDI-TOF MS, 1H NMR, and TGA measurements in detail, and the crystallization behavior of graft polymers was also comprehensively investigated using DSC, WAXD, and POM instruments.

  • synthesis of branch ring branch tadpole shaped linear poly e caprolactone b cyclic poly ethylene oxide b linear poly e caprolactone by combination of Glaser Coupling reaction with ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

  • synthesis of twin tail tadpole shaped cyclic polystyrene block linear poly tert butyl acrylate 2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • synthesis of amphiphilic tadpole shaped copolymers by combination of Glaser Coupling with living anionic polymerization and ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The tadpole-shaped copolymers polystyrene (PS)-b- (cyclic poly(ethylene oxide) (PEO)) (PS-b-(c-PEO)) contained lin- ear tail chains of PS and cyclic head chains of PEO were syn- thesized by combination of Glaser Coupling with living anionic polymerization (LAP) and ring-opening polymerization (ROP). First, the functionalized polystyrene-glycerol (PS-Gly) with two active hydroxyl groups at x end was synthesized by LAP of St and the subsequent capping with 1-ethoxyethyl glycidyl ether and then deprotection of protected hydroxyl group in acid condition. Then, using PS-Gly as macroinitiator, the ROP of EO was performed using diphenylmethylpotassium as cocata- lyst for AB2 star-shaped copolymers PS-b-(PEO-OH)2, and the alkyne group was introduced onto PEO arm end for PS-b-(PEO- Alkyne)2. Finally, the intramolecular cyclization was performed by Glaser Coupling reaction in pyridine/Cu(I)Br/N,N,N 0 ,N 00 ,N 00 - pentamethyldiethylenetriamine system under room tempera- ture, and tadpole-shaped PS-b-(c-PEO) was formed. The target copolymers and their intermediates were well characterized by size-exclusion chromatography, proton nuclear magnetic reso- nance spectroscopy, and fourier transform infrared spectros- copy in details. The thermal properties was also determined and compared to investigate the influence of architecture on properties. The results showed that tadpole-shaped copolymers had lower Tm, Tc ,a ndXc than that of their precursors of AB2 star-shaped copolymers. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2227-2235, 2012

  • Synthesis of branch‐ring‐branch tadpole‐shaped [linear‐poly(ε‐caprolactone)]‐b‐[cyclic‐poly(ethylene oxide)]‐b‐ [linear‐poly(ε‐caprolactone)] by combination of Glaser Coupling reaction with ring‐opening polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

Xiaoshan Fan - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of branch ring branch tadpole shaped linear poly e caprolactone b cyclic poly ethylene oxide b linear poly e caprolactone by combination of Glaser Coupling reaction with ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

  • synthesis of twin tail tadpole shaped cyclic polystyrene block linear poly tert butyl acrylate 2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • synthesis of amphiphilic tadpole shaped copolymers by combination of Glaser Coupling with living anionic polymerization and ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The tadpole-shaped copolymers polystyrene (PS)-b- (cyclic poly(ethylene oxide) (PEO)) (PS-b-(c-PEO)) contained lin- ear tail chains of PS and cyclic head chains of PEO were syn- thesized by combination of Glaser Coupling with living anionic polymerization (LAP) and ring-opening polymerization (ROP). First, the functionalized polystyrene-glycerol (PS-Gly) with two active hydroxyl groups at x end was synthesized by LAP of St and the subsequent capping with 1-ethoxyethyl glycidyl ether and then deprotection of protected hydroxyl group in acid condition. Then, using PS-Gly as macroinitiator, the ROP of EO was performed using diphenylmethylpotassium as cocata- lyst for AB2 star-shaped copolymers PS-b-(PEO-OH)2, and the alkyne group was introduced onto PEO arm end for PS-b-(PEO- Alkyne)2. Finally, the intramolecular cyclization was performed by Glaser Coupling reaction in pyridine/Cu(I)Br/N,N,N 0 ,N 00 ,N 00 - pentamethyldiethylenetriamine system under room tempera- ture, and tadpole-shaped PS-b-(c-PEO) was formed. The target copolymers and their intermediates were well characterized by size-exclusion chromatography, proton nuclear magnetic reso- nance spectroscopy, and fourier transform infrared spectros- copy in details. The thermal properties was also determined and compared to investigate the influence of architecture on properties. The results showed that tadpole-shaped copolymers had lower Tm, Tc ,a ndXc than that of their precursors of AB2 star-shaped copolymers. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2227-2235, 2012

  • Synthesis of branch‐ring‐branch tadpole‐shaped [linear‐poly(ε‐caprolactone)]‐b‐[cyclic‐poly(ethylene oxide)]‐b‐ [linear‐poly(ε‐caprolactone)] by combination of Glaser Coupling reaction with ring‐opening polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Tingting Tang, Kun Huang, Junlian Huang
    Abstract:

    A novel amphiphilic branch-ring-branch tadpole- shaped (linear-poly(e-caprolactone))-b-(cyclic-poly(ethylene ox- ide))-b-(linear-poly(e-caprolactone)) ((l-PCL)-b-(c-PEO)-b-(l-PCL)) was synthesized by combination of Glaser Coupling reaction with ring-opening polymerization (ROP) mechanism. The self- assembling behaviors of (l-PCL)-b-(c-PEO)-b-(l-PCL) and their p- shaped analogs of poly(e-caprolactone)/poly (ethylene oxide))- b-poly(ethylene oxide)-b-(poly(e-caprolactone)/poly(ethylene ox- ide) with comparable molecular weight in water were prelimi- narily investigated. The results showed that the micelles formed from the former took a fiber look, however, that formed from the latter took a spherical look. V C 2012 Wiley Peri- odicals, Inc. J Polym Sci Part A: Polym Chem 50: 3095-3103, 2012

  • Synthesis of twin‐tail tadpole‐shaped (cyclic polystyrene)‐ block‐[linear poly (tert‐butyl acrylate)]2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

Yannan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of twin tail tadpole shaped cyclic polystyrene block linear poly tert butyl acrylate 2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • synthesis of amphiphilic tadpole shaped copolymers by combination of Glaser Coupling with living anionic polymerization and ring opening polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The tadpole-shaped copolymers polystyrene (PS)-b- (cyclic poly(ethylene oxide) (PEO)) (PS-b-(c-PEO)) contained lin- ear tail chains of PS and cyclic head chains of PEO were syn- thesized by combination of Glaser Coupling with living anionic polymerization (LAP) and ring-opening polymerization (ROP). First, the functionalized polystyrene-glycerol (PS-Gly) with two active hydroxyl groups at x end was synthesized by LAP of St and the subsequent capping with 1-ethoxyethyl glycidyl ether and then deprotection of protected hydroxyl group in acid condition. Then, using PS-Gly as macroinitiator, the ROP of EO was performed using diphenylmethylpotassium as cocata- lyst for AB2 star-shaped copolymers PS-b-(PEO-OH)2, and the alkyne group was introduced onto PEO arm end for PS-b-(PEO- Alkyne)2. Finally, the intramolecular cyclization was performed by Glaser Coupling reaction in pyridine/Cu(I)Br/N,N,N 0 ,N 00 ,N 00 - pentamethyldiethylenetriamine system under room tempera- ture, and tadpole-shaped PS-b-(c-PEO) was formed. The target copolymers and their intermediates were well characterized by size-exclusion chromatography, proton nuclear magnetic reso- nance spectroscopy, and fourier transform infrared spectros- copy in details. The thermal properties was also determined and compared to investigate the influence of architecture on properties. The results showed that tadpole-shaped copolymers had lower Tm, Tc ,a ndXc than that of their precursors of AB2 star-shaped copolymers. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2227-2235, 2012

  • Synthesis of twin‐tail tadpole‐shaped (cyclic polystyrene)‐ block‐[linear poly (tert‐butyl acrylate)]2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • Synthesis of amphiphilic tadpole‐shaped copolymers by combination of Glaser Coupling with living anionic polymerization and ring‐opening polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The tadpole-shaped copolymers polystyrene (PS)-b- (cyclic poly(ethylene oxide) (PEO)) (PS-b-(c-PEO)) contained lin- ear tail chains of PS and cyclic head chains of PEO were syn- thesized by combination of Glaser Coupling with living anionic polymerization (LAP) and ring-opening polymerization (ROP). First, the functionalized polystyrene-glycerol (PS-Gly) with two active hydroxyl groups at x end was synthesized by LAP of St and the subsequent capping with 1-ethoxyethyl glycidyl ether and then deprotection of protected hydroxyl group in acid condition. Then, using PS-Gly as macroinitiator, the ROP of EO was performed using diphenylmethylpotassium as cocata- lyst for AB2 star-shaped copolymers PS-b-(PEO-OH)2, and the alkyne group was introduced onto PEO arm end for PS-b-(PEO- Alkyne)2. Finally, the intramolecular cyclization was performed by Glaser Coupling reaction in pyridine/Cu(I)Br/N,N,N 0 ,N 00 ,N 00 - pentamethyldiethylenetriamine system under room tempera- ture, and tadpole-shaped PS-b-(c-PEO) was formed. The target copolymers and their intermediates were well characterized by size-exclusion chromatography, proton nuclear magnetic reso- nance spectroscopy, and fourier transform infrared spectros- copy in details. The thermal properties was also determined and compared to investigate the influence of architecture on properties. The results showed that tadpole-shaped copolymers had lower Tm, Tc ,a ndXc than that of their precursors of AB2 star-shaped copolymers. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2227-2235, 2012

  • preparation of amphiphilic poly ethylene oxide block polystyrene macrocycles via Glaser Coupling reaction under cubr pyridine system
    Journal of Polymer Science Part A, 2011
    Co-Authors: Yannan Zhang, Guowei Wang, Junlian Huang
    Abstract:

    The amphiphilic cyclic poly(ethylene oxide)-block-polystyrene [c-(PEO-b-PS)] was synthesized by cyclization of propargyl-telechelic poly(ethylene oxide)-block-polystyrene-block-poly(ethylene oxide) (PEO-b-PS-b-PEO) via the Glaser Coupling. The hydroxyl-telechelic ABA triblock PEO-b-PS-b-PEO was first prepared by successive living anionic polymerization of styrene and ring-opening polymerization of ethylene oxide, and then the hydroxyl ends were reacted with propargyl bromide to obtain linear precursors with propargyl terminals. Finally, the intramolecular cyclization was conducted in pyridine under high dilution by Glaser Coupling of propargyl ends in the presence of CuBr under ambient temperature, and the c-(PEO-b-PS) was directly obtained by precipitation in petroleum ether with high efficiency. The cyclic products and their corresponding linear precursor PEO-b-PS-b-PEO were characterized by means of GPC, 1H NMR, and FTIR. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

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  • synthesis of twin tail tadpole shaped cyclic polystyrene block linear poly tert butyl acrylate 2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • Synthesis of twin‐tail tadpole‐shaped (cyclic polystyrene)‐ block‐[linear poly (tert‐butyl acrylate)]2 by combination of Glaser Coupling reaction with living anionic polymerization and atom transfer radical polymerization
    Journal of Polymer Science Part A: Polymer Chemistry, 2012
    Co-Authors: Bing Huang, Guowei Wang, Xiaoshan Fan, Yannan Zhang, Junlian Huang
    Abstract:

    The twin-tail tadpole-shaped (cyclic polystyrene)-block- (linear poly (tert-butyl acrylate))2 ((c-PS)-b-(l-PtBA)2 )w as synthe- sized by combination of Glaser Coupling reaction with atom trans- fer radical polymerization (ATRP) and living anionic polymerization (LAP). First, the telechelic PS with an active and an ethoxyethyl-pro- tected hydroxyl groups at both ends was prepared by LAP of St monomers using lithium naphthalenide as initiator and terminated by 1-ethoxyethyl glycidyl ether. And the alkyne groups were intro- duced onto each PS end by selectively reaction of active hydroxy group with propargyl bromide in NaH/tetrahydrofuran (THF) sys- tem. Then, the intramolecular cyclization was carried out by Glaser Coupling reaction in pyridine/Cu(I)Br system in air atmosphere. Finally, the macroinitiator of c-PS with two bromine groups at the junction point was synthesized via the cleavage of ethoxyethyl group and the subsequent esterification of the deprotected hydroxyl groups with 2-bromoisobutyryl bromide. The copolymer of (c-PS)-b-(l-PtBA)2 was obtained by ATRP of tBA monomers, and the PtBA segment was also hydrolyzed for (cyclic polystyrene)- block-(linear polyacrylic acid)2 ((c-PS)-b-(l-PAA)2). The target copolymers and all intermediates were well characterized by GPC, MALDI-TOF MS, and 1 HN MR in detail.V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2444-2451, 2012

  • Synthesis of biocompatible tadpole-shaped copolymer with one poly(ethylene oxide) (PEO) ring and two poly(ɛ-caprolactone) (PCL) tails by combination of Glaser Coupling with ring-opening polymerization
    Polymer, 2012
    Co-Authors: Xiaoshan Fan, Guowei Wang, Bing Huang, Junlian Huang
    Abstract:

    Abstract The biocompatible tadpole-shaped copolymers [cyclic-poly(ethylene oxide) (PEO)]- b -[linear poly(ɛ-caprolactone) (PCL)] 2 [( c -PEO)- b -PCL 2 ] with one PEO ring and two PCL tails were synthesized by combination of Glaser Coupling with ring-opening polymerization (ROP). First, a linear PEO precursor with two alkyne groups at the chain terminal and two hydroxyl groups at the chain middle was prepared by ROP of EO monomer and the following transformation of functional groups. Then, cyclic PEO with two hydroxyl groups at the same site was obtained by the “Glaser” cyclization. Finally, the hydroxyl groups on cyclic PEO directly initiated the ROP of ɛ-CL monomer to produce the target copolymers ( c -PEO)- b -PCL 2 . The target copolymers and intermediates were all well characterized by GPC, MALDI-TOF MS, 1 H NMR and FT-IR.