Swelling Process of Thin Polymer Film Studied via in situ Spectroscopic Ellipsometry

作     者：XU Lin ZOU Zhiming ZHANG Huanhuan SHI Tongfei 

作者机构：Laboratory of Surface Physics and Chemistry Guizhou Education University Guiyang 550018 P. R. China Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P. R. China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2017年第33卷第5期

页      面：833-838页

核心收录：

学科分类：08[工学] 09[农学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0901[农学-作物学] 

基　　金：Supported by the National Natttral Science Foundation of China(Nos. 51503048  21504018  21234007  51473168)  the Grant of Guizhou Education University  China(No. 107003001455) and the Grant of Science and Technology Department of Guizhou Province  China(No. QKH 1137) 

主　　题：Thin polymer film Solvent swelling Dewetting 

摘      要：The swelling process of thin polystyrene films in quantity was studied in this paper using the in situ spec- troscopic ellipsometry. We systematically investigated the influence of film thickness on the swelling process of thin polystyrene films. The results show that in the case of high Mw polystyrene（Mw=400000）, the curve of the swelling degree as a function of time discloses that the relaxation of the long polymer chains accompanies the diffusion of acetone molecules, The swelling process is via the Fickian relaxation mechanism. Both the values of the equilibrium swelling degree and the diffusion coefficient of acetone molecules in the polystyrene film decrease as the film thick- ness reduces under confinement. However, in the case of lowMw PS（Mw=4100）, the dewetting process is so fast be- fore the equilibrium of swelling that the whole swelling process cannot be observed.