Liquid crystalline features in a polyolefin of poly(methylene-1,3- cyclopentane)

Naofumi Naga, Toshikazu Yabe, Akira Sawaguchi, Masato Sone, Keiichi Noguchi, Shigemitsu Murase

研究成果: Article査読

26 被引用数 (Scopus)

抄録

A liquid crystalline phase has been discovered in a polyolefin of poly(methylene-1,3-cyclopentane) (PMCP) having low molecular weight, which was obtained with cyclization polymerization of 1,5-hexadiene (HD) using a zirconocene catalyst in the presence of chain transfer reagents. PMCP clearly shows fluidity and birefringence above the glass transition temperature under the ambient conditions. Schlieren-like texture, which indicates nematic liquid crystalline phase, has been detected in places. Clear diffraction pattern is observed in wide-angle X-ray diffraction analysis below the isotropization temperature. The isotropization temperature decreases with decreasing of molecular weight of the PMCP. PMCP with the higher molecular weight takes the longer time for liquid crystallization from isotropic phase. Non-Newtonian viscosity region in the range of low share rate, which is a characteristic of liquid crystal, has been detected below the isotropization temperature.

本文言語English
ページ(範囲)7448-7452
ページ数5
ジャーナルMacromolecules
41
20
DOI
出版ステータスPublished - 2008 10月 28

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 無機化学
  • 材料化学

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