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Abstract
As-spun fibers of poly(methylhydroquinone 4,4′-diphenyldicarboxylate) (Me-HQ/BB) exhibited a lower modulus than poly(phenylhydroquinone 4,4′-diphenyldicarboxylate) (Ph-HQ/BB) and poly(2-chlorophenylhydroquinone 4,4′-diphenyldicarboxylate) (CP-HQ/BB) due to the lower degree of elongational flow orientation and the lower value of orientation function of the nematic domains (F). However, injection molded specimens of Me-HQ/BB exhibited a higher flexural modulus than Ph-HQ/BB and CP-HQ/BB due to the higher packing density of the polymer chain. Thus, the packing density of polymer chain is a more influential factor than the F value to achieve a high modulus of injection molded specimens.