Synthesis and characterization of sulfonated liquid crystalline polyesters

Qin Lin, Jeremy Pasatta, Zhen He Wang, Varun Ratta, Garth L. Wilkes, Timothy Edward Long

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Liquid crystalline polyesters based on hexanediol, dimethyl 4,4′-biphenyldicarboxylate, and various levels of dimethyl 5-sodiosulfoisophthalate (0-20 mol%) were prepared using a conventional melt polymerization process. The presence and quantification of the ionic functionality was surveyed using 1H NMR spectroscopy. Solution viscosities and corresponding molecular weights decreased when the ionic monomer concentration exceeded a critical value (higher than 3 mol%). Differential scanning calorimetry indicated a maximum in the isotropic transition temperature versus ionic modification at approximately 10 mol%. Dynamic mechanical analysis indicated that the glass transition temperature was suppressed due to ionic association at high concentrations (greater than 3 mol%) of ionic functionality. Polarized light microscopy and wide-angle X-ray diffraction were used to identify the smectic liquid crystalline and crystalline phases.

Original languageEnglish
Pages (from-to)540-546
Number of pages7
JournalPolymer International
Volume51
Issue number6
DOIs
Publication statusPublished - 2002 Jun 1
Externally publishedYes

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Keywords

  • Dimethyl 5-sodiosulfoisophthalate
  • Ionomer
  • Liquid crystalline polyester

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Lin, Q., Pasatta, J., Wang, Z. H., Ratta, V., Wilkes, G. L., & Long, T. E. (2002). Synthesis and characterization of sulfonated liquid crystalline polyesters. Polymer International, 51(6), 540-546. https://doi.org/10.1002/pi.877