Chiral thermotropic polyesters based

PART II. CHIRAL THERMOTROPIC POLYESTERS BASED ON AROMATIC TRIAD UNITS... 

Tables 4 and 5 show the general structures and mesomorphic characteristics of the homo- and co-polycondensate liquid crystal systems, respectively. Chiral thermotropic polyesters have been studied mainly by Blumstein and Krigbaum, almost simultaneously with, or immediately following, the first report by Strzelecki and co-workers.The latter report described also the preparation and properties of a cholesteryl end-capped polyester based on achiral components 4 -hydroxyphenyl 4-hydroxy benzoate and pimelic acid (Table 5).

In Part I we present a survey of the work done in the preparation and characterization of synthetic and semi-synthetic chiral thermotropic liquid crystal polymers. For convenience, we have grouped the polymeric materials (until now reported) according to the nature of the repeat unit and relevant position of the mesogen, side chain and main chain polymers. In Part II we report on the results obtained in our laboratories on optically active thermotropic polyesters containing mesogenic aromatic dyads or triads based on / -oxybenzoic acid. 

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