Formation of Crystallites with Low Surface Energy

DOI Web Site 2 Citations 38 References Open Access
  • TOSAKA Masatoshi
    Institute for Chemical Research, Kyoto University
  • OUE Shohei
    Institute for Chemical Research, Kyoto University
  • GROS Alice
    Ecole Centrale de Nantes, Institut de Recherche en Génie Civil et Mécanique (GeM)
  • HUNEAU Bertrand
    Ecole Centrale de Nantes, Institut de Recherche en Génie Civil et Mécanique (GeM)
  • VERRON Erwan
    Ecole Centrale de Nantes, Institut de Recherche en Génie Civil et Mécanique (GeM)
  • Poompradub Sirilux
    Department of Chemical Technology, Faculty of Science, Chulalongkorn University

Bibliographic Information

Other Title
  • Formation of crystallites with low surface energy - a key to understand the crystallization of oriented polymer
  • － A Key to Understand the Crystallization of Oriented Polymer

Abstract

<p>In order to demonstrate that lower surface energies of bundle-like crystals have a dominant effect for the enhancement of strain-induced crystallization of natural rubber (NR), an estimation of the end-surface energy (σe) was attempted. NR samples were quickly stretched at predetermined crystallization temperature (Tc) to a prescribed draw ratio (αs), and the wide angle X-ray diffraction patterns during the subsequent stepwise heating process were investigated. Melting temperature (Tm) was found to depend solely on αs and to be independent of Tc. Simultaneously, average crystallite size in the chain direction (〈Lｃ〉) was primarily determined by network-chain density and was also independent of Tc. As a result, the plot of Tm versus〈Lｃ〉-1 suggested that σe is negligibly low and estimated Tm is an approximation of the equilibrium melting temperature.</p>

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