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Effect of interfacial roughness on dewetting behavior of polystyrene/poly(methyl methacrylate) bilayer film
Longjian Xue1, Benhui Hu, Yanchun Han
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, People's Republic of China.
Abstract:
The dewetting behavior of polystyrene (PS) film on poly(methyl methacrylate) (PMMA) sublayer was investigated by changing the short-range roughness of the PMMA sublayer systemically. When the bilayer film was heated to the temperature above both Tgs, the protuberances formed in both layers to reduce the system energy. By tracing the dewetting process of the PS up-layer, the dewetting velocity was found to increase with the roughness of the sublayer. It was demonstrated theoretically and experimentally that the equilibrium contact angle, the apparent equilibrium contact angle, and dewetting velocity of PS film on PMMA sublayer were determined by the roughness of PMMA sublayer.
