Design and In-Depth characterization of liquid crystalline polyesters for lower melting points and wider processing windows

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dc.contributor.authorErdogan, Selahattin
dc.date.accessioned2026-04-25T14:19:48Z
dc.date.available2026-04-25T14:19:48Z
dc.date.issued2025
dc.departmentSinop Üniversitesi
dc.description.abstractThis paper presents a thorough examination of thermotropic liquid crystalline polyesters (LCPs) designed to achieve lower melting points and wider nematic windows without sacrificing their strength or stability. The work begins by synthesizing fully aromatic LCPs and then systematically introducing aliphatic segments or partially crystalline polyesters-such as PET, PEN, PBT, PBN, and PHN-to modify melting temperatures (Tm) and phase-transition behavior. Comprehensive characterization was conducted using techniques such as differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), polarized light microscopy (PLM), wide-angle X-ray scattering (WAXS), and nuclear magnetic resonance (NMR). These results indicate that incorporating flexible or semicrystalline domains broadens the temperature range in which the polymers exhibit a nematic phase, thereby improving processability. In particular, formulations containing longer aliphatic diacids, such as octanedioic or decanedioic acid, showed lower Tm values and significantly expanded the temperature windows for nematic ordering. TGA measurements confirmed that an elevated fraction of aromatic units enhances thermal stability, whereas aliphatic constituents support easier processing. WAXS and fiber diffraction analyses revealed a higher degree of crystallinity in the LCPs enriched with PET, correlating with a stronger mechanical performance. Blending these modified LCPs with common thermoplastics (for instance, PET, PP, and ABS) resulted in improvements in tensile strength and overall mechanical behavior, suggesting that these materials are promising candidates for advanced composites. Moreover, detailed analyses of the reaction times and catalysts highlighted the delicate balance between achieving a sufficiently high molecular weight and maintaining tractable melt viscosities. Altogether, this study offers a roadmap for tuning LCP architectures to produce materials with optimized thermal, mechanical, and processing characteristics, thereby widening their suitability for applications ranging from high-performance fibers to industrial-scale thermoplastic composites.
dc.description.sponsorshipMiddle East Technical University (METU), Faculty of Arts and Sciences
dc.description.sponsorshipThis article is derived from my doctoral dissertation. I would like to express my deepest gratitude to my late supervisor, Prof. Dr. Erdal BAYRAMLI, for his valuable guidance and support throughout this work. The authors would like to thank the Middle East Technical University (METU), Faculty of Arts and Sciences, for providing the experimental facilities used during the course of this study.
dc.identifier.doi10.1007/s10965-025-04508-8
dc.identifier.issn1022-9760
dc.identifier.issn1572-8935
dc.identifier.issue10
dc.identifier.orcid0000-0002-3937-577X
dc.identifier.scopus2-s2.0-105019044862
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1007/s10965-025-04508-8
dc.identifier.urihttps://hdl.handle.net/11486/8201
dc.identifier.volume32
dc.identifier.wosWOS:001589636600001
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorErdogan, Selahattin
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofJournal of Polymer Research
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20260420
dc.subjectLiquid crystalline polyesters (LCPs)
dc.subjectThermal processing window
dc.subjectAromatic-Aliphatic copolymer design
dc.subjectThermotropic polymer composites
dc.subjectNematic-Isotropic transition
dc.titleDesign and In-Depth characterization of liquid crystalline polyesters for lower melting points and wider processing windows
dc.typeArticle

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