Synthesis and characterization of sulfonated liquid crystalline polyesters

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

doi:10.1002/pi.877

Synthesis and characterization of sulfonated liquid crystalline polyesters

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 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 language	English
Pages (from-to)	540-546
Number of pages	7
Journal	Polymer International
Volume	51
Issue number	6
DOIs	https://doi.org/10.1002/pi.877
Publication status	Published - 2002 Jun 1
Externally published	Yes

Keywords

Dimethyl 5-sodiosulfoisophthalate
Ionomer
Liquid crystalline polyester

ASJC Scopus subject areas

Polymers and Plastics

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10.1002/pi.877

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title = "Synthesis and characterization of sulfonated liquid crystalline polyesters",

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.",

keywords = "Dimethyl 5-sodiosulfoisophthalate, Ionomer, Liquid crystalline polyester",

author = "Qin Lin and Jeremy Pasatta and Wang, {Zhen He} and Varun Ratta and Wilkes, {Garth L.} and Long, {Timothy Edward}",

year = "2002",

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TY - JOUR

T1 - Synthesis and characterization of sulfonated liquid crystalline polyesters

AU - Lin, Qin

AU - Pasatta, Jeremy

AU - Wang, Zhen He

AU - Ratta, Varun

AU - Wilkes, Garth L.

AU - Long, Timothy Edward

PY - 2002/6/1

Y1 - 2002/6/1

N2 - 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.

AB - 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.

KW - Dimethyl 5-sodiosulfoisophthalate

KW - Ionomer

KW - Liquid crystalline polyester

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U2 - 10.1002/pi.877

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SP - 540

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JO - Polymer International

JF - Polymer International

IS - 6

ER -

Synthesis and characterization of sulfonated liquid crystalline polyesters

Abstract

Keywords

ASJC Scopus subject areas

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