文献类型：期刊文献

英文题名：Multi-tunable self-assembled morphologies of stimuli-responsive diblock polyampholyte films on solid substrates

作者：Han, Xia;Xiong, Zhiying;Zhang, Xuxia;Liu, Honglai[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2015

卷号：11

期号：11

起止页码：2139

外文期刊名：SOFT MATTER

收录：;EI(收录号：20151100623313);WOS:【SCI-EXPANDED(收录号:WOS:000350698500007)】；

基金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (nos 21176065, 21376073, 91334203) and the 111 Project (no. B08021) and the Fundamental Research Funds for the Central Universities of China.

语种：英文

外文关键词：Anionic surfactants - Fractals - Substrates - High resolution transmission electron microscopy

摘要：Intelligent polymers, due to their sensitive stimuli response to changes in the environment, have gained increasing amounts of attention over recent years and have become a popular topic in polymer materials science. In this study, the aggregation behaviors and stimuli responses of the stimuli-responsive diblock polyampholyte poly(2-(dimethylamino) ethyl methacrylate)-b-poly(acrylic acid) (PDMAEMA-b-PAA) are conveniently tunable by introducing pH changes, temperature changes, salt addition and surfactant neutralization. Under different pH values, either globular or fractal self-assemblies can be observed in which the latter have crystal properties. Salts and alkalis can promote the fractal aggregation growth because their deposited crystals can act as nucleation sites for the polyampholyte chains. A combination of fluorescence spectroscopy, atom force microscopy and transmission electron microscopy revealed that the presence of anionic surfactants in the PDMAEMA-b-PAA solutions promoted the solubility of the polyampholyte, consequently leading to a more homogeneous distribution of the polymer chains on the solid substrate upon drying the mixtures. The fractal formation was suppressed for the studied Gemini surfactants, and a higher surfactant hydrophobicity results in an earlier start of the formation of the fractal pattern.