Jh. Chang et Bw. Jo, BLENDS OF PET WITH RIGID THERMOTROPIC LCP HAVING FLEXIBLE SIDE-GROUPS- COMPARISON OF THEIR TENSILE PROPERTIES WITH SEMIRIGID MAIN-CHAIN TLCP BLENDS, Journal of applied polymer science, 60(7), 1996, pp. 939-946
Two new thermotropic liquid crystalline polymers (LCPs) were synthesiz
ed. One is a dimesogenic LCP having a flexible hexamethylene spacer in
the main chain, the other is a rigid-type main-chain LCP having alkox
y side groups on the terephthaloyl moiety of the polymer. Blends of LC
P with poly(butylene) terephthalate were melt-spun at different LCP co
ntents and different draw ratios to produce a monofilament. Maximum en
hancement in the ultimate tensile strength was observed for the blends
containing 5% LCP at any draw ratio, and decreased with further incre
ase in LCP content. The initial modulus monotonically increased with i
ncreasing LCP content. The tensile properties of the rigid-type LCP bl
ends were higher than those of the flexible main-chain LCP blends. (C)
1996 John Wiley & Sons, Inc.