Highly Aromatic Liquid Crystalline Copolyesters Synthesized by Transesterification of Poly(ethylene terephthalate) with Acetoxybenzoic Acid, Diacetoxybenzene and Terephthalic Acid

New liquid‐crystalline copolyesters have been synthesized by the melt transesterification of poly‐ (ethylene terephthalate) (p(ET)) with 4‐acetoxybenzoic acid (H), and varying proportions of equimolar mixtures of diacetylated hydroquinone (Q) and terephthalic acid (T). It has been shown that the ris...

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Bibliographic Details
Published inMacromolecular chemistry and physics Vol. 202; no. 10; pp. 2122 - 2131
Main Authors Baroni, Dario, Romano, Rosalba, Filippi, Sara, Polacco, Giovanni, Paci, Massimo, Magagnini, Pierluigi
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag GmbH 01.06.2001
WILEY‐VCH Verlag GmbH
Wiley
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polycondensation
Preparation, kinetics, thermodynamics, mechanism and catalysts
Terpolymer
Aryl terephthalate copolymer
Property composition relationship
Thermotropic state
Benzoate(hydroxy) copolymer
Transesterification
Experimental study
Transformation temperature
Ester copolymer
Heat of transformation
Dynamic mechanical properties
Liquid crystal polymers
Copolycondensation
Ethylene terephthalate copolymer
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Summary:New liquid‐crystalline copolyesters have been synthesized by the melt transesterification of poly‐ (ethylene terephthalate) (p(ET)) with 4‐acetoxybenzoic acid (H), and varying proportions of equimolar mixtures of diacetylated hydroquinone (Q) and terephthalic acid (T). It has been shown that the risk of solidification of the reaction mixture due to segregation of a high melting phase formed by polymer chains rich in aromatic units is appreciably lowered with respect to systems where only H is reacted with p(ET). Moreover, the addition of appropriate amounts of Q and T (5–30%, with respect to H) has been shown to improve the polymers homogeneity. Thus, p(ETHQ) copolyesters with processability characteristics comparable to those of commercial p(ETH) copolyesters can be prepared with a considerably higher content of aromatic units, with a beneficial effect on mechanical properties and temperature resistance.
Bibliography:ArticleID:MACP2122
ark:/67375/WNG-FH1XWM49-C
istex:BCD5CDB7AD262A6462F1142802719F13F0B18F79
ISSN:1022-1352
1521-3935
DOI:10.1002/1521-3935(20010601)202:10<2122::AID-MACP2122>3.0.CO;2-P