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

Fingerprint

Polyesters
Crystalline materials
Liquids
Dynamic mechanical analysis
Light polarization
Nuclear magnetic resonance spectroscopy
Superconducting transition temperature
Optical microscopy
Differential scanning calorimetry
Monomers
Molecular weight
Polymerization
Association reactions
Viscosity
X ray diffraction

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

Synthesis and characterization of sulfonated liquid crystalline polyesters. / Lin, Qin; Pasatta, Jeremy; Wang, Zhen He; Ratta, Varun; Wilkes, Garth L.; Long, Timothy Edward.

In: Polymer International, Vol. 51, No. 6, 01.06.2002, p. 540-546.

Research output: Contribution to journalArticle

Lin, Q, Pasatta, J, Wang, ZH, Ratta, V, Wilkes, GL & Long, TE 2002, 'Synthesis and characterization of sulfonated liquid crystalline polyesters', Polymer International, vol. 51, no. 6, pp. 540-546. https://doi.org/10.1002/pi.877
Lin Q, Pasatta J, Wang ZH, Ratta V, Wilkes GL, Long TE. Synthesis and characterization of sulfonated liquid crystalline polyesters. Polymer International. 2002 Jun 1;51(6):540-546. https://doi.org/10.1002/pi.877
Lin, Qin ; Pasatta, Jeremy ; Wang, Zhen He ; Ratta, Varun ; Wilkes, Garth L. ; Long, Timothy Edward. / Synthesis and characterization of sulfonated liquid crystalline polyesters. In: Polymer International. 2002 ; Vol. 51, No. 6. pp. 540-546.
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