Nano-oriented Crystals (NOCs) of Polymer Crystallized by Super Critical Melt-elongation

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  • OKADA Kiyoka
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • HIKOSAKA Masamichi
    Graduate School of Integrated Arts and Sciences, Hiroshima University

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  • 超臨界伸長結晶化によるナノ配向結晶体（NOC）ポリマーの創成
  • チョウリンカイ シンチョウ ケッショウカ ニ ヨル ナノハイコウ ケッショウタイ(NOC)ポリマー ノ ソウセイ

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Abstract

Polymer nucleation is the process of disentanglement and chain sliding diffusion along the chain axis due to the topological nature of chain-like polymers. Although the large “melt elongation” of polymers should significantly affect crystallization that controls the structure and properties of solids, it has been difficult due to technical reasons. We showed that nucleation and morphology changed under large elongational strain field: they discontinuously changed from heterogeneous to homogeneous nucleation and from spherulite to new morphology of “nano-oriented crystals (NOCs)”, respectively, when the elongational strain rate increased larger than a critical elongational strain rate. NOCs showed ultra-high performance such as high tensile strength, high thermal resistance and high transparency.

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