Structure Evolution and Kinetics of Thermoreversible Gelation in a Rigid-Rod Polyimide/m-Cresol System

Thein Kyu, Jen Chang Yang, Stephen Z.D. Cheng, Steven L.C. Hsu, Frank W. Harris

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Biphenyltetracarboxylic dianhydride-(perfluoromethyl) benzidine (BPDA-PFMB) polyimide/m-cresol solutions showed thermoreversible gelation associated with thermally induced phase separation and subsequent liquid crystal formation. In this study, phase equilibria and structure evolution in a BPDA-PFMB/m-cresol solution were investigated by differential scanning calorimetry, polarized optical microscopy, and depolarized light scattering. A temperature-composition phase diagram of BPDA-PFMB/m-cresol was established by a cloud point method. Kinetic aspects of the phase transition were studied in the framework of a nucleation and growth theory. The average domain size, which characterized the length scale of rigid-rod aggregates, was found to depend on supercooling.

Original languageEnglish
Pages (from-to)1861-1868
Number of pages8
JournalMacromolecules
Volume27
Issue number7
DOIs
Publication statusPublished - 1994 Mar 1

All Science Journal Classification (ASJC) codes

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

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