Chain conformation effects on molecular motions at the surface of poly(methyl methacrylate) films

Yoshihisa Fujii, Kei Ichi Akabori, Keiji Tanaka, Toshihiko Nagamura

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    26 Citations (Scopus)

    Abstract

    Surface relaxation in syndiotactic (st-) and isotactic (it-) poly(methyl methacrylate) (PMMA) films was studied by lateral force microscopy. The αa- and β-relaxation processes were clearly observed even at the surface, permitting us to deduce the form of the dispersion map for the surface relaxation processes. Both relaxation temperatures at the surface were lower than the corresponding ones in the bulk. In addition, the extent to which the peak temperature for the surface relaxation processes fell below that of the bulk strongly depended on the stereoregularity of the films. The differences in the chain conformations between the surface and the bulk, which were more remarkable in the st-PMMA, produced this variation in surface mobility.

    Original languageEnglish
    Pages (from-to)928-934
    Number of pages7
    JournalPolymer Journal
    Volume39
    Issue number9
    DOIs
    Publication statusPublished - 2007

    All Science Journal Classification (ASJC) codes

    • Polymers and Plastics
    • Materials Chemistry

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