Interfacial Characteristics of Amorphous Polystyrene and Binary Polymer Blend Thin Films Based on Scanning Force Microscopy
Surface viscoelastic functions for monodisperse PS film was evaluated by using scanning viscoelasticity microscope(SVM). In the case of number average molecular weight, Mn less than ca. 30,000, it was revealed that the film surface was in a glass-rubber transition state even at 293 K. A depression of surface Tg compared with that for the bulk sample was explained by the surface localization of chain end groups. By combining atomic force microscopy(AFM) and SVM observations, the surface aggregation structure of the polymer blend films can be evaluated with the scale of sub-nanometers. The phase separated structures of polystyrene/poly(vinyl methyl ether) (PS/PVME) and polystyrene/polyisoprene (PS/PI) were analyzed by AFM and SVM.
KeywordsAtomic Force Microscopy Image Number Average Molecular Weight Ultrathin Film Scan Force Microscopy Atomic Force Microscopy Observation
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