Abstract
A series of thermotropic, liquid crystalline copolyesters was prepared which contained both mesogenic and non-mesogenic units. The melt state anisotropy of the copolymers varied greatly with composition, and within an intermediate compositional range, the copolymers formed biphasic melts, which contained both nematic and isotropic phases. The amount of the nematic phase and the continuity of that phase decreased with increasing non-mesogenic unit content until no anisotropic phase could be observed by polarized light microscopy. The term “degree of liquid crystallinity” is proposed to describe and estimate the fraction of the anisotropic phase present in the biphasic compositional range. For one biphasic copolyester sample, the two phases were separated by solvent fractionation and characterized for their unit composition and liquid crystalline properties.
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