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

Qin Lin, Jeremy Pasatta, Timothy Edward Long*

*この研究の対応する著者

研究成果: Article査読

38 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2512-2520
ページ数9
ジャーナルJournal of Polymer Science, Part A: Polymer Chemistry
41
16
DOI
出版ステータスPublished - 2003 8月 15
外部発表はい

ASJC Scopus subject areas

  • ポリマーおよびプラスチック
  • 有機化学
  • 材料化学

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