Phase transition and transition kinetics of a thermotropic poly(amide-imide) derived from 70% pyromellitic dianhydride, 30% terephthaloyl chloride, and 1,3-bis[4-(4′-aminophenoxy)cumyl]benzene

S. L. Liu, Tai-Shung Chung*, J. X. Geng, E. L. Zhou, S. Tamai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The phase transition and transition kinetics of a liquid crystalline copoly(amide-imide) (PA137), which was synthesized from 70 mol % pyromellitic dianhydride, 30 mol % terephthaloyl chloride, and 1,3-bis[4-(4′-aminophenoxy)cumyl]benzene, was characterized by differential scanning calorimetry, polarized light microscopy, X-ray diffraction, and rheology. PAI37 exhibits a glass transition temperature at 182°C followed by multiple phase transitions. The crystalline phase starts to melt at ∼220°C and forms smectic C (S C ) phase. The S C phase transforms into smectic A (S A ) phase when the temperature is above 237°C. The S C to S A transition spans a broad temperature range in which the S A phase vanishes and forms isotropic melt. The WAXD fiber pattern of PAI37 pulled from the anisotropic melt revealed an direction. The transition kinetics for the mesophase and crystalline phase formation was also studied.

Original languageEnglish (US)
Pages (from-to)8710-8719
Number of pages10
JournalMacromolecules
Volume34
Issue number25
DOIs
StatePublished - Dec 4 2001

ASJC Scopus subject areas

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

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