Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions

Abstract Thermotropic liquid crystal copolyester (TLCP) was synthesized using a melt polymerization method, with a molar ratio composition of 2,5-diethoxy terephthalic acid (ETA), hydroquinone (HQ), and p-hydroxybenzoic acid (HBA) of 1:1:3. TLCP exhibited nematic liquid crystalline mesophase and mai...

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Autores principales:	Won Jun Lee, Lee Ku Kwac, Hong Gun Kim, Jin-Hae Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ccfce65b68474fe9a835bcf1f7420b45
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spelling	oai:doaj.org-article:ccfce65b68474fe9a835bcf1f7420b452021-12-02T17:50:41ZThermotropic liquid crystalline copolyester fibers according to various heat treatment conditions10.1038/s41598-021-91212-42045-2322https://doaj.org/article/ccfce65b68474fe9a835bcf1f7420b452021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91212-4https://doaj.org/toc/2045-2322Abstract Thermotropic liquid crystal copolyester (TLCP) was synthesized using a melt polymerization method, with a molar ratio composition of 2,5-diethoxy terephthalic acid (ETA), hydroquinone (HQ), and p-hydroxybenzoic acid (HBA) of 1:1:3. TLCP exhibited nematic liquid crystalline mesophase and maintained nematic textures under all heat treatment conditions applied. The synthesized TLCP was processed into fibers using a capillary rheometer. The liquid crystalline mesophase, thermo-mechanical properties, and morphology of TLCP fibers obtained under various heat treatment conditions were investigated. The thermo-mechanical properties of the heat-treated fibers were improved compared to those of the as-spun fibers. The best results were obtained for TLCP fibers annealed at 230 °C for 9 h. The heat-treated fibers showed a well-developed microfiber morphology compared to the as-spun fibers. In the spun fibers, a skin–core morphology was observed regardless of the heat treatment conditions, and a well-developed fiber morphology better than the core area was observed in the skin area. The diameter of the fiber heat-treated at 230 °C for 9 h was approximately 60–110 nm.Won Jun LeeLee Ku KwacHong Gun KimJin-Hae ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Won Jun Lee Lee Ku Kwac Hong Gun Kim Jin-Hae Chang Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
description	Abstract Thermotropic liquid crystal copolyester (TLCP) was synthesized using a melt polymerization method, with a molar ratio composition of 2,5-diethoxy terephthalic acid (ETA), hydroquinone (HQ), and p-hydroxybenzoic acid (HBA) of 1:1:3. TLCP exhibited nematic liquid crystalline mesophase and maintained nematic textures under all heat treatment conditions applied. The synthesized TLCP was processed into fibers using a capillary rheometer. The liquid crystalline mesophase, thermo-mechanical properties, and morphology of TLCP fibers obtained under various heat treatment conditions were investigated. The thermo-mechanical properties of the heat-treated fibers were improved compared to those of the as-spun fibers. The best results were obtained for TLCP fibers annealed at 230 °C for 9 h. The heat-treated fibers showed a well-developed microfiber morphology compared to the as-spun fibers. In the spun fibers, a skin–core morphology was observed regardless of the heat treatment conditions, and a well-developed fiber morphology better than the core area was observed in the skin area. The diameter of the fiber heat-treated at 230 °C for 9 h was approximately 60–110 nm.
format	article
author	Won Jun Lee Lee Ku Kwac Hong Gun Kim Jin-Hae Chang
author_facet	Won Jun Lee Lee Ku Kwac Hong Gun Kim Jin-Hae Chang
author_sort	Won Jun Lee
title	Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
title_short	Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
title_full	Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
title_fullStr	Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
title_full_unstemmed	Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
title_sort	thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ccfce65b68474fe9a835bcf1f7420b45
work_keys_str_mv	AT wonjunlee thermotropicliquidcrystallinecopolyesterfibersaccordingtovariousheattreatmentconditions AT leekukwac thermotropicliquidcrystallinecopolyesterfibersaccordingtovariousheattreatmentconditions AT honggunkim thermotropicliquidcrystallinecopolyesterfibersaccordingtovariousheattreatmentconditions AT jinhaechang thermotropicliquidcrystallinecopolyesterfibersaccordingtovariousheattreatmentconditions
_version_	1718379314406227968

Thermotropic liquid crystalline copolyester fibers according to various heat treatment conditions

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