Molecular design of main-chain liquid crystalline polyolefin

Naofumi Naga, Masato Sone, Keiichi Noguchi, Shigemitsu Murase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Liquid crystalline features of polyolefin have been clearly observed in a polyolefin of poly(methlene-1,3-cyclopentane) (PMCP) obtained from cyclization polymerization of 1,5-hexadiene (HD) using metallocene catalysts. PMCP clearly shows fluidity and birefringence above the glass transition temperature under the ambient conditions, at around room temperature and normal pressure. First order structures of PMCP, such as cyclization selectivity of polymerized HD units, stereo-regularity of 1,3-cyclopentane units, and molecular weight, affect the liquid crystalline features of PMCP. High cyclization selectivity and trans-rich structure of 1,3-cyclopentane units are necessary to induce the liquid crystalline phase. Polarized optical micrographs of PMCP show Schlieren-like texture, which indicates nematic liquid crystalline phase. Clear diffraction patterns are observed in wide-angle X-ray diffraction analysis below the isotropization temperatures. The isotropization temperature decreases with decreasing of molecular weight of PMCP. PMCP with the higher molecular weight takes the longer time for liquid crystallization from isotropic phase in the cooling process. We have also synthesized an optically active PMCP with an optically active metallocene catalyst in the presence of a chain transfer reagent to control the molecular weights of the resulting polymers. Optically active PMCP with relatively high molecular weight shows finger print texture which indicates cholesteric liquid crystal. On the other hand, decreasing molecular weight the optically active PMCP induces nematic liquid crystalline phase.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7414
DOIs
Publication statusPublished - 2009
EventLiquid Crystals XIII - San Diego, CA
Duration: 2009 Aug 22009 Aug 5

Other

OtherLiquid Crystals XIII
CitySan Diego, CA
Period09/8/209/8/5

Fingerprint

Polyolefins
molecular weight
Molecular weight
Crystalline materials
Cyclopentanes
Cyclization
Liquids
liquids
hexadiene
textures
Textures
selectivity
Cholesteric liquid crystals
catalysts
Catalysts
Fluidity
Crystallization
Birefringence
regularity
Temperature

Keywords

  • 1,5-hexadiene
  • Cholesteric liquid crystal
  • Cyclizaion polymerization
  • Liquid crystal
  • Metallocene catalyst
  • Nematic liquid crystal
  • Optical active
  • Polyolefin

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Naga, N., Sone, M., Noguchi, K., & Murase, S. (2009). Molecular design of main-chain liquid crystalline polyolefin. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7414). [741404] https://doi.org/10.1117/12.825051

Molecular design of main-chain liquid crystalline polyolefin. / Naga, Naofumi; Sone, Masato; Noguchi, Keiichi; Murase, Shigemitsu.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7414 2009. 741404.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Naga, N, Sone, M, Noguchi, K & Murase, S 2009, Molecular design of main-chain liquid crystalline polyolefin. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7414, 741404, Liquid Crystals XIII, San Diego, CA, 09/8/2. https://doi.org/10.1117/12.825051
Naga N, Sone M, Noguchi K, Murase S. Molecular design of main-chain liquid crystalline polyolefin. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7414. 2009. 741404 https://doi.org/10.1117/12.825051
Naga, Naofumi ; Sone, Masato ; Noguchi, Keiichi ; Murase, Shigemitsu. / Molecular design of main-chain liquid crystalline polyolefin. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7414 2009.
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