Temperature dependence of birefringence and stress for natural rubber vulcanizates at strained state

Akihiro Suzuki, Hidetoshi Oikawa, Kenkichi Murakami

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The temperature dependence of stress and birefringence for natural rubber vulcanizates under medium and large deformation was measured for the processes of cooling, heating and re-cooling. In order to investigate the relation between the stress and crystal phase, the observed birefringence, Δt, was converted into the crystallinity, Xv, by the following equation: Xv = Δt-Δna°fa Δnc°fc-Δna°fa. where Δn0c, Δn0a, fa and fc are the intrinsic birefringence of the crystal, that of the amorphous phase, the orientation factor of crystallites, and that of amorphous phase, respectively. The fusion of crystallites induced by the thermal crystallization resulted in the increasing contractile force, while the fusion of strain-induced crystallites induced the reduction of contractile force.

    Original languageEnglish
    Pages (from-to)247-252
    Number of pages6
    JournalPolymer
    Volume26
    Issue number2
    DOIs
    Publication statusPublished - 1985 Feb

    Keywords

    • birefringence
    • crystallinity
    • fusion and recrystallization
    • natural rubber vulcanizates
    • stress

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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