Issue 14, 2013
From the journal:

Polymer Chemistry

Solventannealing induced phase separation and dewetting in PMMA/SAN blend films: composition dependence

Shuangshuang Zhang,a   Tongfei Shi,b   Jichun You*a  and  Yongjin Li*a  

* Corresponding authors

a College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, No. 16 Xuelin Rd., Xiasha High-tech Zone, Hangzhou 310036, P. R. China
E-mail: yongjin-li@hznu.edu.cn, youjichun@126.com

b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Str., Changchun 130022, P. R. China

Abstract

The competition between “dewetting” and “phase separation” behaviors in polymer blend films attracts significant attention. The simultaneous phase separation and dewetting in PMMA/SAN [poly(methyl methacrylate) and poly(styrene-ran-acrylonitrile)] blend ultrathin films upon solvent annealing have been observed in our previous work. The composition dependence of phase behaviors in the same system has been investigated using atomic force microscopy and grazing incidence small-angle X-ray scattering. Both phase separation and dewetting were observed across the entire composition range investigated. The evolution of film structures during solvent annealing was dependent on the blend composition. Solvent annealing led to complex structures, in which the upper (small spots, bicontinuous structures or large continuous droplet) and lower (mimic-film) parts were composed of phase-separated SAN- and PMMA-rich phases, respectively. With increasing blend SAN weight fraction, the diameter of the lower PMMA-rich mimic-film decreased. The upper SAN-rich phase structure transformed depending on the SAN content; to small spots (<50% SAN content), a bicontinuous structure (50% SAN content), or a large continuous droplet (>50% SAN content), on top of the PMMA mimic-film.

Graphical abstract: Solvent annealing induced phase separation and dewetting in PMMA/SAN blend films: composition dependence

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Article information

DOI
https://doi.org/10.1039/C3PY00290J
Article type
Paper
Submitted
01 Mar 2013
Accepted
01 May 2013
First published
01 May 2013

Polym. Chem., 2013,4, 3943-3948

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Solvent annealing induced phase separation and dewetting in PMMA/SAN blend films: composition dependence

S. Zhang, T. Shi, J. You and Y. Li, Polym. Chem., 2013, 4, 3943 DOI: 10.1039/C3PY00290J

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