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

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17 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
Publication statusPublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry

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    Kyu, T., Yang, J. C., Cheng, S. Z. D., Hsu, S. L. C., & Harris, F. W. (1994). Structure evolution and kinetics of thermoreversible gelation in a rigid-rod polyimide/m-cresol system. Macromolecules, 27(7), 1861-1868.