New monomers, 2,5-(4-alkoxybenzoyl-oxy)benzyl acrylates were synthesized. Upon radical polymerizations of these monomers thermotropic liquid crystalline polyacrylates with mesogens laterally attached to polymer backbones via short linkages were obtained. The polymers were found non-crystalline by WAXS measurements. Above glass transition all the polymers had a stable mesophase as revealed by DSC and a polarizing microscope. The glass transition and the isotropization temperatures were about 100°C and about 165°C respectively, both varying with the size of the R substituents in the mesogens. The term “mesogen-jacketed polymer” is proposed to describe this type of polymers of which the main chains are jacketed with laterally substituted mesogens and to distinguish this new class of side chain liquid crystal polymers from the conventional ones.
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Li et al. (1988) studied this question.
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