Behaviour of the spin-spin relaxation time for natural rubber vulcanizates under large deformation

Hidetoshi Oikawa, Kenkichi Murakami

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The spin-spin relaxation time, T2, for DCP-cured natural rubber with various crosslink densities, ve, has been measured under various deformation. T2 is separated into two components: one is the long T2 component, T2L, for the mobility of amorphous network chains, the other is the short one, T2S, for that of the strain-induced crystalline chains. T2L decreased exponentially with increasing extension ratio,α, and the decreasing rate was more remarkable with increasing ve. The α and ve dependence of T2L has been quantitatively explained by the equation experimentally derived by Nishi et al. T2L under various extension increased and became almost constant with increasing temperature, while the corrected fraction of T2S, T2S (%), gradually decreased. The apparent melting point, Tm, at which the corrected T2S (%) was zero under various deformation was determined. The α dependence of Tm, has been discussed by using Flory's equation.

Original languageEnglish
Pages (from-to)1737-1741
Number of pages5
JournalPolymer
Volume23
Issue number12
DOIs
Publication statusPublished - 1982 Nov

Keywords

  • Pulsed nuclear magnetic resonance
  • dipolar interaction
  • enthalpy of fusion
  • natural rubber vulcanizates
  • spin-spin relaxation time
  • strain-induced crystalline

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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