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New PET‐Based Liquid Crystalline Copolyesters and Their Use in Blends and Composites
Author(s) -
Valtriani Alessio,
Polacco Giovanni,
Filippi Sara,
Magagnini Pierluigi,
Incarnato Loredana,
Acierno Domenico
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(20010701)202:11<2202::aid-macp2202>3.0.co;2-j
Subject(s) - terephthalic acid , transesterification , materials science , ethylene , polyester , polymerization , composite material , homogeneity (statistics) , polymer chemistry , phase (matter) , poly ethylene , polymer , chemical engineering , organic chemistry , catalysis , chemistry , statistics , mathematics , engineering
New liquid crystalline copolyesters have been synthesized by melt transesterification of poly(ethylene terephthalate), p(ET), with 4‐acetoxybenzoic acid (H), and varying proportions of equimolar mixtures of diacetylated 4,4′‐dihydroxybiphenyl (B) and terephthalic acid (T). The solidification of the polymerizing mixture due to segregation of a highly aromatic crystalline phase, which limited the available range of compositions when p(ET) was modified with H only, was shown not to take place when moderate amounts of T and B were added to H. The p(ETHB) copolyesters are shown to posses high structural homogeneity, even when the content of p(ET) in the starting mixture is as low as 10 mol‐%. The thermal properties of the copolyesters can be changed in a fairly wide range by varying the chemical composition. As a result, the properties of the new LCPs can easily be optimized in view of different applications, such as the production of blends with flexible thermoplastics or of glass fiber‐reinforced composites.