Thermotropic polyesters: Synthesis and properties of poly(p‐oxybenzoate‐co‐m‐phenylene terephthalate)s
作者:
Philip J. Brown,
Ismail Karacan,
Jing Liu,
J. Eric McIntyre,
Alexander H. Milburn,
J. George Tomka,
期刊:
Polymer International
(WILEY Available online 1991)
卷期:
Volume 24,
issue 1
页码: 23-32
ISSN:0959-8103
年代: 1991
DOI:10.1002/pi.4990240105
出版商: John Wiley&Sons, Ltd
关键词: aromatic polyesters;thermotropic;nematic;liquid crystalline;transition temperatures
数据来源: WILEY
摘要:
AbstractDSC, TMA, hot‐stage microscopy and WAXS have been used to examine the effect of concentration of angular units and molecular weight on the thermal transitions of poly(p‐oxybenzoate‐co‐m‐phenylene terephthalate)s. Copolymers containing molar fractions ofm‐phenylenedioxy units between 0·20 and 0·30 are melt processable nematogenic materials. In contrast, poly(p‐oxybenzoate‐co‐p‐phenylene isophthalate)s remain nematogenic over a wider concentration range (0·20–0·40) of angular isophthaloyl units. Comparison of fibres produced from copolymers with the same fraction of angular units (0·25) indicates that those with isophthaloyl units have a higher modulus than those withm‐phenylenedioxy units. These differences are ascribed to differences in planarity of chains containing isophthaloyl andm‐phen
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