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

22 引用 (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.

元の言語English
ページ(範囲)7448-7452
ページ数5
ジャーナルMacromolecules
41
発行部数20
DOI
出版物ステータスPublished - 2008 10 28

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Cyclopentanes
Polyolefins
Molecular weight
Crystalline materials
Liquids
Liquid Crystals
Fluidity
Cyclization
Crystallization
Birefringence
Liquid crystals
Temperature
X ray diffraction analysis
Diffraction patterns
Textures
Polymerization
Viscosity
Catalysts
PL 732

ASJC Scopus subject areas

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

これを引用

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

Liquid crystalline features in a polyolefin of poly(methylene-1,3- cyclopentane). / Naga, Naofumi; Yabe, Toshikazu; Sawaguchi, Akira; Sone, Masato; Noguchi, Keiichi; Murase, Shigemitsu.

:: Macromolecules, 巻 41, 番号 20, 28.10.2008, p. 7448-7452.

研究成果: Article

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, 巻. 41, 番号 20, pp. 7448-7452. https://doi.org/10.1021/ma800682h
Naga, Naofumi ; Yabe, Toshikazu ; Sawaguchi, Akira ; Sone, Masato ; Noguchi, Keiichi ; Murase, Shigemitsu. / Liquid crystalline features in a polyolefin of poly(methylene-1,3- cyclopentane). :: Macromolecules. 2008 ; 巻 41, 番号 20. pp. 7448-7452.
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