The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform
Xiaoyu Huang - One of the best experts on this subject based on the ideXlab platform.
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tbcpma a new trifunctional Acrylic Monomer for convenient synthesis of a well defined amphiphilic graft copolymer by successive rdrp
Polymer Chemistry, 2014Co-Authors: Chun Feng, Gang Sun, Xunwei Liu, Xiaoyu HuangAbstract:A series of well-defined amphiphilic graft copolymers, consisting of a hydrophobic poly(tert-butyl acrylate) backbone and hydrophilic poly(N-isopropylacrylamide) side chains, were synthesized by successive reversible addition–fragmentation chain transfer (RAFT) polymerization and supplemental activator and reducing agent atom transfer radical polymerization (SARA ATRP) in the presence of Cu(0). A new Cl-containing acrylate Monomer, tert-butyl 2-((2-chloropropanoyloxy)methyl)acrylate, was first RAFT homopolymerized in a controlled way to give a well-defined homopolymer with a narrow molecular weight distribution (Mw/Mn = 1.10). This homopolymer directly initiated SARA ATRP of N-isopropylacrylamide to afford well-defined poly(tert-butyl acrylate)-g-poly(N-isopropylacrylamide) (PtBA-g-PNIPAM) graft copolymers (Mw/Mn ≤ 1.30) via the grafting—from a strategy without polymeric functionality transformation to introduce the initiating group. Finally, the hydrophobic PtBA backbone was selectively hydrolyzed in an acidic environment without affecting PNIPAM side chains to provide poly(Acrylic acid)-g-poly(N-isopropylacrylamide) (PAA-g-PNIPAM) graft copolymers. The influences of the length of PNIPAM side chains and the salinity on the critical micelle concentration of the PtBA-g-PNIPAM amphiphilic graft copolymer were examined by fluorescence spectroscopy. Furthermore, thermo-responsive behaviors of the copolymers were investigated by UV-vis spectroscopy, dynamic light scattering, and transmission electron microscopy.
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synthesis of paa g pnipam well defined graft polymer by sequential raft and set lrp and its application in preparing size controlled super paramagnetic fe3o4 nanoparticles as a stabilizer
Polymer, 2014Co-Authors: Xiuyu Jiang, Xiaoyu Huang, Sujuan Zhai, Xue JiangAbstract:A series of well-defined double hydrophilic graft copolymers, poly(Acrylic acid)-g-poly(N-iso-propylacrylamide) (PAA-g-PNIPAM), was employed as a novel water-soluble coating for constructing superparamagnetic iron oxide nanoparticles. The copolymer was synthesized via a three-step procedure: firstly, a well-defined hydrophobic PtBA-based backbone, poly(tert-butyl 2-((2-chloropropanoyloxy)-methyl)acrylate)-co-poly(tert-butyl acrylate), (PtBCPMA(19)-co-PtBA(18)), was prepared through RAFT copolymerization of a new trifunctional Acrylic Monomer, tert-butyl 2-((2-chloropropanoyloxy)methyl) acrylate and tert-butyl acrylate; secondly, taking this backbone as a macroinitiator to initiate SET-LRP of N-isopropylacrylamide resulted in well-defined (poly(tert-butyl 24(2-chloropropanoyloxy)methyl)acrylate)-co-poly(tert-butyl acrylate))-g-poly(N-isopropylacrylamide) ((PtBCPMA-co-PtBA)-g-PNIPAM) amphiphilic graft copolymers with relatively narrow polydispersities (M-w/M-n <= 1.31); thirdly, handling (PtBCPMA-co-PtBA)-g-PNIPAM in acidic conditions afforded PAA-g-PNIPAM graft copolymers. The resulting PAA-g-PNIPAM copolymers were directly utilized as a polymeric stabilizer in the preparation of superparamagnetic Fe3O4 nanoparticles. The particle size can be readily tuned in the range of 12.1-23.2 nm by varying the amount of PAA-g-PNIPAM copolymer or the length of PNIPAM side chain. Besides, the structure and properties of prepared Fe3O4/polymer nanocomposites were characterized by XRD, FT-IR, TGA, TEM, and magnetic measurement in detail. (C) 2014 Elsevier Ltd. All rights reserved.
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tbhbma a novel trifunctional Acrylic Monomer for the convenient synthesis of paa g pcl well defined amphiphilic graft copolymer
Polymer Chemistry, 2013Co-Authors: Xuemei Song, Wenqiang Yao, Xiaoyu HuangAbstract:A series of well-defined amphiphilic graft copolymers, consisting of a hydrophilic poly(Acrylic acid) (PAA) backbone and hydrophobic poly(e-caprolactone) (PCL) side chains, was synthesized by the combination of reversible addition–fragmentation chain transfer (RAFT) polymerization and ring-opening polymerization (ROP). A new acrylate Monomer containing a ROP initiation group, tert-butyl(2-((4-hydroxybutanoyloxy)methyl)acrylate), was first prepared using tert-butyl acrylate as the starting material, and it was homopolymerized by RAFT in a controlled way to give a well-defined homopolymer bearing ROP initiation group in every repeating unit. This homopolymer directly initiated ROP of e-caprolactone to provide well-defined poly(tert-butyl acrylate)-g-poly(e-caprolactone) graft copolymers via the grafting-from strategy without post-polymerization functionality transformation. Finally, the hydrophobic poly(tert-butyl acrylate) backbone was selectively hydrolyzed in an acidic environment without affecting the PCL side chains to afford poly(Acrylic acid)-g-poly(e-caprolactone) amphiphilic graft copolymers possessing the hydrophilic PAA backbone and equally distributed hydrophobic PCL side chains. The self-assembly behavior of the obtained amphiphilic graft copolymers and pH-sensitivity of the resultant micelles were investigated by fluorescence spectroscopy, DLS, and TEM. DSC and XRD analysis showed the crystallization behavior of poly(Acrylic acid)-g-poly(e-caprolactone) graft copolymers.
Zhengtao Deng - One of the best experts on this subject based on the ideXlab platform.
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direct hot injection synthesis of lead halide perovskite nanocubes in Acrylic Monomers for ultrastable and bright nanocrystal polymer composite films
ACS Applied Materials & Interfaces, 2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which ...
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Direct Hot-Injection Synthesis of Lead Halide Perovskite Nanocubes in Acrylic Monomers for Ultrastable and Bright Nanocrystal–Polymer Composite Films
2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which were processed using octadecene (ODE) as the solvent for NC synthesis and postprocessed for UV polymerization. Significantly, the as-fabricated films by post-processing free strategy exhibited excellent photostability against strong Xe lamp illumination; while the other films using classic methods were quickly photodegraded. Meanwhile, these NC–polymer composite films showed good stability against moisture and heating when aging in water at 50 °C for over 200 h. These films, along with K2SiF6:Mn4+ (KSF) phosphor emitters, were used as downconverters for blue light-emitting diodes in liquid-crystal displays with a wide color gamut of 115% in the International Commission on Illumination (CIE) 1931 color space. This work provides a facile and effective strategy for the preparation of ultrastable and bright color-conversion NC films for the development of the next-generation wide color gamut displays
Shuming Nie - One of the best experts on this subject based on the ideXlab platform.
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direct hot injection synthesis of lead halide perovskite nanocubes in Acrylic Monomers for ultrastable and bright nanocrystal polymer composite films
ACS Applied Materials & Interfaces, 2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which ...
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Direct Hot-Injection Synthesis of Lead Halide Perovskite Nanocubes in Acrylic Monomers for Ultrastable and Bright Nanocrystal–Polymer Composite Films
2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which were processed using octadecene (ODE) as the solvent for NC synthesis and postprocessed for UV polymerization. Significantly, the as-fabricated films by post-processing free strategy exhibited excellent photostability against strong Xe lamp illumination; while the other films using classic methods were quickly photodegraded. Meanwhile, these NC–polymer composite films showed good stability against moisture and heating when aging in water at 50 °C for over 200 h. These films, along with K2SiF6:Mn4+ (KSF) phosphor emitters, were used as downconverters for blue light-emitting diodes in liquid-crystal displays with a wide color gamut of 115% in the International Commission on Illumination (CIE) 1931 color space. This work provides a facile and effective strategy for the preparation of ultrastable and bright color-conversion NC films for the development of the next-generation wide color gamut displays
Jianyu Tong - One of the best experts on this subject based on the ideXlab platform.
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direct hot injection synthesis of lead halide perovskite nanocubes in Acrylic Monomers for ultrastable and bright nanocrystal polymer composite films
ACS Applied Materials & Interfaces, 2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which ...
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Direct Hot-Injection Synthesis of Lead Halide Perovskite Nanocubes in Acrylic Monomers for Ultrastable and Bright Nanocrystal–Polymer Composite Films
2019Co-Authors: Jianyu Tong, Wei Shen, Yukang Zhang, Yao Liu, Tao Zhang, Shuming Nie, Zhengtao DengAbstract:In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications because of their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskite NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here, we report a new post-processing free strategy (i.e., without centrifugation, separation, and dispersion process) of using an ultraviolet (UV)-polymerizable Acrylic Monomer of lauryl methacrylate as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylate oligomer, Monomer (IBOA), and initiator for direct UV polymerization to fabricate NC–polymer composite films. These films exhibited an improved photoluminescence quantum yield (85–90%) than classic NC films (40–50%), which were processed using octadecene (ODE) as the solvent for NC synthesis and postprocessed for UV polymerization. Significantly, the as-fabricated films by post-processing free strategy exhibited excellent photostability against strong Xe lamp illumination; while the other films using classic methods were quickly photodegraded. Meanwhile, these NC–polymer composite films showed good stability against moisture and heating when aging in water at 50 °C for over 200 h. These films, along with K2SiF6:Mn4+ (KSF) phosphor emitters, were used as downconverters for blue light-emitting diodes in liquid-crystal displays with a wide color gamut of 115% in the International Commission on Illumination (CIE) 1931 color space. This work provides a facile and effective strategy for the preparation of ultrastable and bright color-conversion NC films for the development of the next-generation wide color gamut displays
H D Rozman - One of the best experts on this subject based on the ideXlab platform.
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studies on the synthesis of acrylamidomethyl cellulose ester and its application in uv curable surface coatings induced by free radical photoinitiator part 1 acrylamidomethyl cellulose acetate
Carbohydrate Polymers, 2006Co-Authors: R N Kumar, H D RozmanAbstract:Abstract This paper reports on the development of cellulose derivatives, which can undergo cross linking on exposure to UV radiation. To achieve this, cellulose acetate was reacted with N-methylol-acrylamide (NMA) in homogeneous phase catalyzed by acids. Analysis of computer aided statistically designed experiments showed that the NMA concentration and reaction temperature played a predominant role in the acrylamidomethylation process. FTIR spectroscopy and 13C NMR were employed to confirm the formation of the acrylamidomethyl cellulose acetate. The acrylamiomethyl cellulose acetate (AMCA) so obtained was employed in the UV curable formulations. The UV curable formulations contained AMCA, Photoinitiator (Irgacure 184), multifunctional Acrylic Monomer (Trimethylolpropane Triacrylate), epoxy acrylate (EBECRYL 600) and N,N-Dimethylacrylamide. A Central Composite Design (CCD) was adopted to collect and interpret data. Properties of the surface coatings were determined. The Pendulum Hardness and Elongation of the UV cured films remain unimpaired by the addition of the polymerizable cellulose ester. A small increase in water absorption was observed. The investigation showed that all the cured films have high gel content and a good adhesion to wood.
