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Chenyang Xing - One of the best experts on this subject based on the ideXlab platform.
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semiCrystalline polymer binary phase structure templated quasi block graft copolymers
Journal of Physical Chemistry B, 2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers...
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SemiCrystalline Polymer Binary-Phase Structure Templated Quasi-Block Graft Copolymers
2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers with well-defined structure, upon varying the grafting ratios. The microphase separated quasi-block grafted copolymers exhibit excellent mechanical properties and good electrical properties. The elongation at break is 480% and the stress at break is as high as 30 MPa for the sample with the lamellar-like structure having the grafting ratio of 45.4 wt%
Jipeng Guan - One of the best experts on this subject based on the ideXlab platform.
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semiCrystalline polymer binary phase structure templated quasi block graft copolymers
Journal of Physical Chemistry B, 2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers...
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SemiCrystalline Polymer Binary-Phase Structure Templated Quasi-Block Graft Copolymers
2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers with well-defined structure, upon varying the grafting ratios. The microphase separated quasi-block grafted copolymers exhibit excellent mechanical properties and good electrical properties. The elongation at break is 480% and the stress at break is as high as 30 MPa for the sample with the lamellar-like structure having the grafting ratio of 45.4 wt%
Fumitaka Horii - One of the best experts on this subject based on the ideXlab platform.
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Highly isotactic poly(vinyl alcohol) derived from tert-butyl vinyl ether. Part IV. Some physical properties, structure and hydrogen bonding of highly isotactic poly(vinyl alcohol) films
Polymer, 2006Co-Authors: Hiroyuki Ohgi, Toshiaki Sato, Fumitaka HoriiAbstract:Some basic physical properties, structure and hydrogen bonding have been characterized for different stereoregular PVA films including highly isotactic PVAs (HI-PVAs), which were recently succeeded in synthesis, as functions of the mm fraction by using different analytical methods. The melting temperature, degree of crystallinity, and 13C spin–lattice relaxation time of the Crystalline component are found to have their own clear minima at the mm fraction of about 0.4–0.5. This fact suggests that structural disordering associated with the decrease in crystallinity may be most strongly induced at this mm fraction. The formation of the new crystal form of PVA has been reconfirmed for HI-PVAs with the mm fractions higher than about 0.55 by FTIR spectroscopy and the structure and hydrogen bonding have been investigated in detail by solid-state 13C NMR spectroscopy. It is found that all OH groups are allowed to form successive intramolecular hydrogen bonding along the respective chains in the Crystalline Region for HI-PVAs with the mm fractions higher than about 0.7. Since these chains should contain some amount of r units even in the Crystalline Region, a slightly helical structure with a considerably long period may be adopted by them as an energetically stable state. On the basis of the line shape analysis of the CP/MAS 13C NMR spectra of the Crystalline components, structural causes of the appearance of the minima of the physical values described above are also discussed in relation to the introduction of disordered units mainly associated with hydrogen bonding to the syndiotactic or isotactic sequences forming successive intermolecular or intramolecular hydrogen bonding, respectively.
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Crystalline nonCrystalline structure and chain diffusion associated with the 180 flip motion for polyethylene single crystals as revealed by solid state 13c nmr analyses
Macromolecules, 2000Co-Authors: Kazuhiro Kuwabara, Hironori Kaji, Masaki Tsuji, Fumitaka HoriiAbstract:The structure of the nonCrystalline overlayer and molecular motion in the Crystalline Region for polyethylene single crystals have been investigated by solid-state 13C NMR spectroscopy and transmission electron microscopy. Our previous finding that the nonCrystalline overlayer is mainly composed of loose loops is confirmed for the single crystals with a typical lozenge shape by the line shape analysis of the fully relaxed DD/MAS 13C NMR spectrum with the aids of 13C spin−lattice and spin−spin relaxation time measurements. The occurrence of the 180° flip motion in the Crystalline Region is clarified by using similar methods performed in the previous work. Moreover, the chain diffusion associated with the flip motion in the Crystalline Region is also observed at 78 °C in the 2D 13C exchange NMR spectrum. A one-dimensional random walk simulation is carried out to clarify the correlation between the 180° flip motion and the chain diffusion. The loose loop structure of the nonCrystalline overlayer is still kep...
Yanyuan Wang - One of the best experts on this subject based on the ideXlab platform.
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semiCrystalline polymer binary phase structure templated quasi block graft copolymers
Journal of Physical Chemistry B, 2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers...
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SemiCrystalline Polymer Binary-Phase Structure Templated Quasi-Block Graft Copolymers
2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft copolymers using the binary phase structure of semiCrystalline polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the Crystalline Region and the ILs are only located in the amorphous Region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the polymer blocks in the amorphous Region, while the EBI does not affect the chemical structure of the Crystalline Region. Therefore, the quasi-block graft copolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block copolymers can be microphase separated into the various nanostructures, as the block copolymers with well-defined structure, upon varying the grafting ratios. The microphase separated quasi-block grafted copolymers exhibit excellent mechanical properties and good electrical properties. The elongation at break is 480% and the stress at break is as high as 30 MPa for the sample with the lamellar-like structure having the grafting ratio of 45.4 wt%
Jilin Cao - One of the best experts on this subject based on the ideXlab platform.
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phase equilibrium of the quaternary system k2so4 mgso4 nh4 2so4 h2o at 25 c
Fluid Phase Equilibria, 2013Co-Authors: Chunyan Xue, Bin Zhao, Hongfei Guo, Shuaiyong Dou, Jilin CaoAbstract:The solubilities of the ternary system MgSO4–(NH4)2SO4–H2O and the quaternary system Na2SO4–MgSO4–(NH4)2SO4–H2O at 0 °C were measured, and the phase diagrams of these two systems were plotted. On the basis of the phase diagrams obtained, we analyzed each saturation point and Crystalline Region. It indicated that ammonium sulfate as the salting-out agent can form double salt MgSO4·(NH4)2SO4·6H2O with magnesium sulfate, realizing better separation of sodium sulfate and magnesium sulfate. On the basis of the Pitzer model of electrolyte solution theory, the ionic strength function was introduced to express the interaction parameters between two kinds of electrolyte at 0 °C. The interaction parameters were regressed from the experimental data of the ternary systems, and the solubilities of Na2SO4–MgSO4–(NH4)2SO4–H2O system at 0 °C were calculated. The results showed that the calculated values were well consistent with experimental results.