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Highly Aromatic Liquid Crystalline Copolyesters Synthesized by Transesterification of Poly(ethylene terephthalate) with Acetoxybenzoic Acid, Diacetoxybenzene and Terephthalic Acid
Author(s) -
Baroni Dario,
Romano Rosalba,
Filippi Sara,
Polacco Giovanni,
Paci Massimo,
Magagnini Pierluigi
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010601)202:10<2122::aid-macp2122>3.0.co;2-p
Subject(s) - terephthalic acid , transesterification , ethylene , materials science , polymer chemistry , dimethyl terephthalate , polymer , poly ethylene , polyester , hydroquinone , organic chemistry , chemistry , catalysis , composite material
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.