Synthesis and characterization of sulfonated liquid crystalline polyesters

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

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

14 Scopus citations

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 (US)
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
State	Published - Jun 2002
Externally published	Yes

Keywords

Dimethyl 5-sodiosulfoisophthalate
Ionomer
Liquid crystalline polyester

ASJC Scopus subject areas

Polymers and Plastics
Organic Chemistry
Materials Chemistry

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10.1002/pi.877

Cite this

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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 E.}",

year = "2002",

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doi = "10.1002/pi.877",

language = "English (US)",

volume = "51",

pages = "540--546",

journal = "Polymer International",

issn = "0959-8103",

publisher = "John Wiley and Sons Ltd",

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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 E.

PY - 2002/6

Y1 - 2002/6

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

DO - 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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