ISSN:
0887-624X
Keywords:
thermotropic copolyamide
;
polyethyleneglycol bis(4-carboxyphenyl)ethers
;
diamine segment length
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Thermotropic copolyamides were prepared from triethyleneglycol bis(4-carboxy-phenyl)ether (PEG3) and two types of diamines, substituted p-phenylenediamines and 4,4'-diaminodiphenyls, and depression of melting point and isotropization temperature of the copolymers produced were measured as a function of diamine combination. The depression was not practically observed by the combinations of homologous diamines with several kinds and numbers of substituents, but significant by those of the diamines with different lengths of the mesogenic segments, and by the molar ratios of the diamines employed. The effect was discussed in terms of deviation of interchain hydrogen bonding between amide bonds in the main chain. © 1994 John Wiley & Sons, Inc.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1994.080320110
