聚甲基丙烯酸甲酯/苯乙烯-丙烯腈无规共聚物薄膜表面原位原子力显微镜相图

doi:10.3724/SP.J.1095.2014.30122

摘要/Abstract

摘要： 采用原位原子力显微镜在线跟踪方法，研究了聚甲基丙烯酸甲酯/苯乙烯丙烯腈无规共聚物共混体系表面相分离行为，得到了具有下临界共溶温度（临界温度约为175 ℃）原位相图。与文献报道的用离位方法所得结果的主要差别是原位的临界相分离温度稍有提高，以及离位结果中存在的组成对称性。这些差别主要来源于离位和原位实验方法上的差别，薄膜厚度减小导致的相容性，热力学历史的变化以及基底效应的加剧。

关键词: 共混, 相分离, 原位, 原子力显微镜

Abstract: The phase diagram of surface phase separation in poly(methyl methacrylate)/poly(styrene-co-acrylonitrile)(PMMA/SAN) blend film with thickness of 130 nm was obtained by in-situ atomic force microscopy(AFM). The results show that the blend film has a lower critical system temperature(LCST) compared with the reported ex-situ phase diagram. The critical phase separation temperature was found to increase and the observed composition symmetry in ex-situ phase diagram was no longer existed. The difference between in-situ and ex-situ results can be ascribed to the thinner thickness of the film, different heat history and stronger substrate effect.

Key words: polymer blend, phase separation, in-situ, atomic force microscopy

中图分类号:

O631

陶荟春, 张双双, 张晶莹, 艾淑平, 由吉春. 聚甲基丙烯酸甲酯/苯乙烯-丙烯腈无规共聚物薄膜表面原位原子力显微镜相图[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30122.

TAO Huichun1*, ZHANG Shuangshuang2, ZHANG Jingying1, AI Shuping1, YOU Jichun2. In-situ Atomic Force Microscopy Study on Phase Diagram of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blend Films Surface[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30122.

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