Glassy State and Glass Transition-Its Elucidation and New Applications. II. Glass Transition Temperature near the Solid Surface of Poly(methyl methacrylate).

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  • ガラス状態とガラス転移―その解明と応用への新展開　ＩＩ　ポリメチルメタクリレート固体表面のガラス転移温度
  • ポリメチルメタクリレート コタイ ヒョウメン ノ ガラス テンイ オンド

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Abstract

Poly (methyl methacrylate) s, (PMMA) s, were spin-labeled in methanol to study the surface molecular mobility. Transition temperature in molecular motion, T5.0mT, obtained by ESR was found to be lower than that in the bulk. Glass transition temperature near the solid surface can be estimated using the ESR data and WLF equation. The glass transition temperature near the solid surface of PMMA was estimated to be approximately 30-40 K lower than that in the bulk. This fact indicates that the segmental density near the solid surface is lower than that of the bulk polymer. In addition, it was found that the molecular mobility near the solid surface depends on the tacticity of PMMA.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 53 (12), 823-828, 1996

    The Society of Polymer Science, Japan

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