Fractionation of poly(p-dhenylene benzobisthiazole) and its crystallization from dilute solution

Jin Gong, Kaoru Shimamura, Kunio Kimura, Shin Ichiro Kohana

Research output: Contribution to conferencePaperpeer-review

Abstract

Fractionation of rigid polymer, poly(p-phenylene benzobisthiazole), was carried out in dilute solution in concentrated methane sulfuric acid using silica gels as packing material of a column. Several combinations of the average chain length of the fractionating materials and the average pore diameter of the gels were examined to improve fractionation resolution. The gels with the average pore diameter near the average chain length resulted in high fractionation resolution. Single crystals of the fractionated and unfractionated PBZT's were observed by TEM. Both single crystals were fundamentally composed of rod crystals with the chain orienting normal to the rods. The unfractionated PBZT made a cluster of parallel rod crystals, where longer chains penetrated a few rod crystals leaving their chain ends within the crystalline core. On the contrary, with the fractionated polymer, extended-chain rod-like crystals were dispersed, isolated each other. This morphology enables us to estimate the chain length visibly by TEM, for which a few milligram of the material is enough for the observation.

Original languageEnglish
Number of pages1
Publication statusPublished - Dec 1 2006
Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
Duration: Sep 20 2006Sep 22 2006

Other

Other55th Society of Polymer Science Japan Symposium on Macromolecules
CountryJapan
CityToyama
Period9/20/069/22/06

Keywords

  • Crystal growth rate
  • Fractionation
  • Polymer single crystals
  • Rigid polymer

ASJC Scopus subject areas

  • Engineering(all)

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