Thermal properties and crystallinity of thermotropic liquid crystalline copolyesters prepared from poly(ethylene terephtalate) (PET) and rigid aromatic units

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dc.contributor.authorTan, Abdullah
dc.contributor.authorAltinok, Eaydar
dc.contributor.authorYerlikaya, Zekeriya
dc.contributor.authorAksoy, Serpil
dc.date.accessioned2020-06-25T17:43:53Z
dc.date.available2020-06-25T17:43:53Z
dc.date.issued2007
dc.description.abstractA series of copolyesters were synthesized by rnelt-polycondensation reaction of poly(ethylene terephtalate) (PET) with various proportions of equimolar compositions of p-acetoxybenzoic acid (p-ABA), hydroquinone diacetate (HQDA) and terephtalic acid (TPA). Viscosity, liquid crystallinity, thermal properties, degree of crystallinity and thermal stabilitiy of these copolyesters were investigated by Ubbelohde viscometer, hot-stage polarized light microscopy (PLM), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and thermogravimetric analysis,TGA), respectively. On the basis of viscosity measurement, it was observed that intrinsic viscosity values of the copolyesters are increased regularly with increasing amounts of aromatic units (p-ABA, HQDA and TPA) in the polymer chain. Thermotropic liquid crystalline behavior was observed in the copolyesters containing over 50 mol% of rigid p-ABA/HQDA/TPA aromatic units. DSC analysis of the anisotropic copolyesters revealed broad and weak endotherms associated with the nematic phases, and the melting temperatures were found to be in the processable region. As the mol% of PET in the polymer chain increased, the specific enthalpies of fusion and the degree of crystallinity of the copolyesters were also increased regularly.en_US
dc.identifier.citationclosedAccessen_US
dc.identifier.doi10.1080/10601320601188323
dc.identifier.endpage431en_US
dc.identifier.issn1060-1325
dc.identifier.issue4-6en_US
dc.identifier.scopus2-s2.0-33947164235
dc.identifier.scopusqualityN/A
dc.identifier.startpage425en_US
dc.identifier.urihttps://doi.org10.1080/10601320601188323
dc.identifier.urihttps://hdl.handle.net/20.500.12587/3932
dc.identifier.volume44en_US
dc.identifier.wosWOS:000246013200011
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.subjectpoly(ethylene terephthalate)en_US
dc.subjectliquid-crystalline copolyesteren_US
dc.subjectthermal propertiesen_US
dc.subjectcrystallinityen_US
dc.subjectcopolymerizationen_US
dc.titleThermal properties and crystallinity of thermotropic liquid crystalline copolyesters prepared from poly(ethylene terephtalate) (PET) and rigid aromatic unitsen_US
dc.typeArticle

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