文献类型：期刊文献

英文题名：Synthesis and self-assembly of tadpole-shaped organic/inorganic hybrid poly(N-isopropylacrylamide) containing polyhedral oligomeric silsesquioxane via RAFT polymerization

作者：Zhang, Weian[1]; Liu, Li[2]; Zhuang, Xiaodong[1]; Li, Xiaohui[1]; Bai, Jinrui[1]; Chen, Yu[1]

机构：[1] Lab for Advanced Materials, Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; [2] School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240, China

年份：2008

卷号：46

期号：21

起止页码：7049

外文期刊名：Journal of Polymer Science, Part A: Polymer Chemistry

收录：EI(收录号：20084611694329)

语种：英文

外文关键词：Amides - Differential scanning calorimetry - Micelles - Acrylic monomers - Glass transition - Living polymerization - Molecular weight - Atomic force microscopy - Chains - Light scattering - Oligomers - Free radical polymerization

摘要：Aminopropylisobutyl polyhedral oligomeric silsesquioxane (POSS) was used to prepare a POSS-containing reversible addition-fragmentation transfer (RAFT) agent. The POSS-containing RAFT agent was used in the RAFT polymerization of N-isopropylacrylamide (NIPAM) to produce tadpole-shaped organic/inorganic hybrid Poly(N-isopropylacrylamide) (PNIPAM). The results show that the POSS-containing RAFT agent was an effective chain transfer agent in the RAFT polymerization of NIPAM, and the polymerization kinetics were found to be pseudo-first-order behavior. The thermal properties of the organic/inorganic hybrid PNIPAM were also characterized by differential scanning calorimetry. The glass transition temperature (Tg) of the tadpole-shaped inorganic/organic hybrid PNIPAM was enhanced by POSS molecule. The self-assembly behavior of the tadpole-shaped inorganic/organic hybrid PNIPAM was investigated by atomic force microscopy and dynamic light scattering. The results show the core-shell nanostructured micelles with a uniform diameter. The diameter of the micelle increases with the molecular weight of the hybrid PNI-PAM. Surprisingly, the micelle of the tadpole-shaped inorganic/organic hybrid PNIPAM with low molecular weight has a much bigger and more compact core than that with high molecular weight. ? 2008 Wiley Periodicals, Inc.