QUIESCENT CRYSTALLIZATION IN THERMOTROPIC POLYESTERS.

S. B. Warner, M. Jaffe

Research output: Contribution to journalConference articlepeer-review

Abstract

In the reported study, the heterogeneous nucleation and growth from quiescent melts of thermotropic polyesters has been examined and analyzed by the technique outlined by Avrami. These polymers are characterized by an Avrami exponent, n, of about 2, indicating rod-like growth from sporadic nuclei, and a rate constant 1n K, of about -22 sec** minus **3, which is typical of semi-crystalline polymers. Unlike low molecular weight nematogens, gross reorganization is not observed during crystallization. The molecular ordering in the solid is very poor, resembling that of the melt, and can be modelled well by close packed rods. There is only a very small drop in entropy upon crystallization as would also be the case in crystallization of conventional (flexible) polymers from oriented melts.

Original languageEnglish (US)
Pages (from-to)98-101
Number of pages4
JournalAm Chem Soc Div Polym Chem Prepr
Volume20
Issue number1
StatePublished - 1979
Externally publishedYes
EventPap presented at Jt ACS/JCS (Am Chem Soc/Jpn Chem Soc) Meet - Honolulu, HI, USA
Duration: Apr 1 1979Apr 6 1979

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

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