Pulsed NMR studies on long-term crystallization behavior and melting process of natural rubber under elongation

Motonori Komura, Ken Nakajima, Toshio Nishi, Takayuki Ikehara, Qiu Zhaobin

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Long-term crystallization and melting process of natural rubber under elongation was investigated by measuring spin-spin relaxation time T2 by pulsed nuclear magnetic resonance (NMR). We examined the dependence of the both processes on extension ratio, crystallization temperature and crosslink density. It was found that the crystallization of natural rubber continued over three months even at 10 °C. According to the two-step melting process found for the first time under elongation, we proposed a model that crystalline part of natural rubber under large elongation is composed of two kinds of crystallites from highly extended and loose chains. The situation is caused by the microscopic distribution of extension ratio of the chains between crosslink points.

    Original languageEnglish
    Pages (from-to)110-120
    Number of pages11
    JournalRubber Chemistry and Technology
    Volume81
    Issue number1
    DOIs
    Publication statusPublished - 2008 Jan 1

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry

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