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

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

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22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)7448-7452
Number of pages5
JournalMacromolecules
Volume41
Issue number20
DOIs
Publication statusPublished - 2008 Oct 28

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ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Naga, N., Yabe, T., Sawaguchi, A., Sone, M., Noguchi, K., & Murase, S. (2008). Liquid crystalline features in a polyolefin of poly(methylene-1,3- cyclopentane). Macromolecules, 41(20), 7448-7452. https://doi.org/10.1021/ma800682h