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

Thein Kyu, Jen Chang Yang, Stephen Z.D. Cheng, Lien-Chung Hsu, Frank W. Harris

Research output: Contribution to journalArticle

16 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

Fingerprint

Gelation
Polyimides
Supercooling
Kinetics
Phase structure
Phase equilibria
Phase separation
Light scattering
Liquid crystals
Phase diagrams
Optical microscopy
Differential scanning calorimetry
Liquid Crystals
Nucleation
Phase transitions
Chemical analysis
Temperature
4-cresol
benzidine

All Science Journal Classification (ASJC) codes

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

Cite this

Kyu, Thein ; Yang, Jen Chang ; Cheng, Stephen Z.D. ; Hsu, Lien-Chung ; Harris, Frank W. / Structure Evolution and Kinetics of Thermoreversible Gelation in a Rigid-Rod Polyimide/m-Cresol System. In: Macromolecules. 1994 ; Vol. 27, No. 7. pp. 1861-1868.
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Structure Evolution and Kinetics of Thermoreversible Gelation in a Rigid-Rod Polyimide/m-Cresol System. / Kyu, Thein; Yang, Jen Chang; Cheng, Stephen Z.D.; Hsu, Lien-Chung; Harris, Frank W.

In: Macromolecules, Vol. 27, No. 7, 01.03.1994, p. 1861-1868.

Research output: Contribution to journalArticle

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AU - Harris, Frank W.

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AB - 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.

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