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Phase Transition of Poly(acrylic acid-co-N-isopropylacrylamide) Core-shell Nanogels
Xiao-bing Liu,Jian-feng Zhou,Xiao-dong Ye*
Author NameAffiliationE-mail
Xiao-bing Liu Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Jian-feng Zhou Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Xiao-dong Ye* Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China xdye@ustc.edu.cn 
Abstract:
A series of poly(acrylic acid) macromolecular chain transfer agents with different molecular weights were synthesized by reversible addition-fragmentation chain transfer (RAFT) poly-merization and characterized by 1H NMR and gel permeation chromatography. Multirespon-sive core-shell nanogels were prepared by dispersion polymerization of N-isopropylacrylamide in water using these poly(potassium acrylate) macro-RAFT agents as the electrosteric sta-bilizer. The size of the nanogels decreases with the amount of the macro-RAFT agent, indicating that the surface area occupied by per polyelectrolyte group is a critical param-eter for stabilizing the nanogels. The volume phase transition and the zeta potentials of the nanogels in aqueous solutions were studied by dynamic light scattering and zetasizer analyzer, respectively.
Key words:  Core-shell nanogel, Dispersion polymerization, Multiresponsive, Phase tran-sition
FundProject:
具有核壳结构的纳米凝胶的相变
刘小兵,周剑锋,叶晓东*
摘要:
通过可逆加成-断裂链转移聚合合成了一系列不同分子量的聚丙烯酸大分子链转移剂,用1H NMR和水相GPC对其进行了表征.以三硫代碳酸盐的聚丙烯酸钾作为稳定剂,在水相中进行N-异丙基丙烯酰胺(NIPAM)的分散聚合合成了一种具有多重响应的核壳结构的纳米凝胶.结合动态光散射的表征研究了聚丙烯酸稳定PNIPAM表面的能力,发现稳定表面的能力与其分子量及用量密切有关.利用动态光散射以及zeta电位分析仪研究了在溶液中纳米凝胶相转变和zeta电位对温度以及pH值的依赖性.
关键词:  核壳纳米凝胶,分散聚合,多重响应,相变
DOI:10.1088/1674-0068/25/04/463-468
分类号: