Synthesis and characterization of chiral liquid-crystalline polyesters containing sugar-based diols via melt polymerization

Qin Lin, Jeremy Pasatta, Timothy Edward Long

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Liquid-crystalline (LC) polyesters based on hexanediol or butanediol, dimethyl 4,4′-biphenyldicarboxylate, and a sugar-based diol, isosorbide or isomanide, were prepared with conventional melt polymerization. 1H NMR spectroscopy confirmed that 50 mol% of the charged sugar diol was successfully incorporated into various copolyesters. Modest molecular weights were obtained, although they were typically lower than those of polyester analogues that did not contain sugar-based diols. Thermogravimetric analysis demonstrated that the incorporation of isosorbide or isomanide units did not reduce the thermal stability in a nitrogen atmosphere. Melting points that ranged from 190 to 270°C were achieved as a function of the copolyester composition. The lined focal conic fan textures, typical indications of a chiral smectic C LC phase, were observed upon the shearing of the LC melt under polarized light microscopy. Atomic force microscopy revealed that the twisted molecular orientation in the chiral LC phase induced periodically soft lamellar structures.

Original languageEnglish
Pages (from-to)2512-2520
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume41
Issue number16
DOIs
Publication statusPublished - 2003 Aug 15
Externally publishedYes

Keywords

  • Chiral
  • Liquid crystal
  • Polyesters

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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