文献类型：期刊文献

英文题名：Rationally designed hyperbranched azopolymer with temperature, photo and pH responsive behavior

作者：Sun, Liuying[1];Gao, Fei[1];Shen, Dingfeng[1];Liu, Zhenghui[1];Yao, Yuan[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Shanghai Key Lab Adv Polymer Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2018

卷号：9

期号：21

起止页码：2977

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20182305287151);WOS:【SCI-EXPANDED(收录号:WOS:000434242400014)】；

基金：This work was supported by the National Natural Science Foundation of China (51622301, 51573046 and 51573088). Support from the Projects of Shanghai Municipality (14SG29 and 17JC400700) and the Fundamental Research Funds for the Central Universities (B14018 and WD1616010) is also appreciated.

语种：英文

外文关键词：Morphology - Silver nanoparticles - Dendrimers - pH - Addition reactions

摘要：A new azobenzene-containing hyperbranched polymer, HPAzoAMAM-star-EG3, was efficiently synthesized via two-step Michael addition polymerization. The proposed polymer could self-assemble into uniform large compound micelles (LCMs) that show temperature, photo and pH responsiveness. The LCMs turned into pancake-like platelets when cooled to ca. 20 degrees C and their spherical morphology was restored at temperatures higher than 30 degrees C. Upon irradiation with linear polarized light (LPL), the LCMs were elongated into short spindles. The photo-isomerization rate could be accelerated by loading silver nanoparticles (SNPs) into the LCMs via direct reduction. Moreover, the LCMs broke down into a much smaller size when the pH value was less than a critical point, ca. 3.90, whereas they remained stable at higher pH values. The combined advantages of the facile synthesis, hyperbranched structure, uniform morphology of assembly and multi-responsiveness endow the polymer with promising potential for applications in controlled release and smart deformable micro/nanostructures.