Effect of polycondensation reaction conditions on the properties of thermotropic liquid-crystalline copolyester

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dc.contributor.authorYikici, Meryem
dc.contributor.authorYerlikaya, Zekeriya
dc.contributor.authorAksoy, Serpil
dc.contributor.authorAltinok, Haydar
dc.date.accessioned2020-06-25T17:48:03Z
dc.date.available2020-06-25T17:48:03Z
dc.date.issued2008
dc.description.abstractIn this study a range of wholly aromatic copolyesters based on kink m-acetoxybenzoic acid (m-ABA) monomer (33 mol%) and equimolar-linear p-acetoxybenzoic acid (p-ABA), hydroquinone diacetate (HQDA) and terephthalic acid (TPA) monomers (67 mol%) have been synthesized by melt polycondensation reaction process at 280 degrees C and 260 degrees C for different time intervals. Characterization of copolyesters were performed by solution viscosity measurement, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), hot-stage polarized light microscopy, proton-nuclear magnetic resonance analysis ((1)H-NMR). According to the results obtained, copolyesters showed thermotropic liquid crystalline behavior in an appropriate temperature range. The copolyesters were prepared in high yields. It was observed that the intrinsic viscosities of the copolyesters are increased regularly with increasing polymerization time and temperature. All the copolyesters were soluble in a trifluoroacetic acid/dichloromethane (30:70 v/v) except the copolyesters which were synthesized at 280 degrees C in 5h. According to the WAXD results; the degree of crystallinity of copolyesters were found to be between 5-15%. DSC and hot stage polarized light microscopy results showed that all the copolyesters are melt processable and a significant molecular interaction exist in a very broad temperature range (160 degrees C and 165 degrees C) in the nematic mesophase. The Tg values are increased with an increasing polycondensation reaction time and temperature and they were observed between 93-126 degrees C. Fibers prepared by a hand-spinning technique from the polymer melt exhibit well-developed fibrillar structure parallel to the fiber axis.en_US
dc.identifier.citationclosedAccessen_US
dc.identifier.doi10.1080/10601320802168744
dc.identifier.endpage627en_US
dc.identifier.issn1060-1325
dc.identifier.issue8en_US
dc.identifier.scopus2-s2.0-47749138232
dc.identifier.scopusqualityN/A
dc.identifier.startpage620en_US
dc.identifier.urihttps://doi.org10.1080/10601320802168744
dc.identifier.urihttps://hdl.handle.net/20.500.12587/4274
dc.identifier.volume45en_US
dc.identifier.wosWOS:000257056500004
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTaylor & Francis Incen_US
dc.relation.ispartofJournal Of Macromolecular Science Part A-Pure And Applied Chemistry
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectthermotropicen_US
dc.subjectliquid crystallineen_US
dc.subjectcopolyesteren_US
dc.subjectpolycondensationen_US
dc.subjectmelt spinningen_US
dc.subjectfiberen_US
dc.titleEffect of polycondensation reaction conditions on the properties of thermotropic liquid-crystalline copolyesteren_US
dc.typeArticle

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