Citation: W. J. Jackson, Jr.. ADVANCES IN LIQUID CRYSTALLINE POLYESTERS*[J]. Chinese Journal of Polymer Science, ;1992, 10(3): 195-202. shu

ADVANCES IN LIQUID CRYSTALLINE POLYESTERS*

W. J. Jackson ,
Jr.

Advances have been made in understanding the interactions of composition, molecular weight, liquid crystallinity,orientation, and three-dimensional crystallinity on the properties of injection-molded and melt-spun liquid crystalline polyesters (LCP's). Two classes of potentially low-cost LCP's were compared:(1) semiflexible LCP's prepared from 1,6-hexanediol and the dimethyl ester of either trans-4, 4'stilbenedicarboxylic acid or 4.4 ' biphenyldicarboxylic acid and (2) all-aromatic LCP's prepared from terephthalic acid,2,6-naphthalenedicarboxylic acid,the diacetate of hydroquinone,and the acetate of p-hydroxybenzoic acid.The effects of composition on the plastic properties of the 4-component all-aromatic LCP's were determined with the aid of a 3×3 dactorial statistically designed experiment,the generation of equations with a computer program,and the plotting of three-dimensional figures and contour diagrams.The effects of obsolute molecular weight(Mw) on the tensile strengths of the semiflexible LCP's and one of the all-aromatic LCP's having an excellent balance of plastic properties were also compared,and it was observed that the semiflexible LCP's required Mm's about 4 times higher than the all-aromatic LCP to attain a given strength.Persistence lengths and molecular modeling were used to explain these differences.
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