Studies on the thermotropic liquid‐crystalline polymer. VIII. Synthesis and properties of fully aromatic poly(ester)s and poly(amide‐ester)s containing p‐phenylene diacrylic group

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Abstract
Three series of polymers containing p‐phenylene diacrylic group were prepared by direct polycondensation in the presence of diphenylchlorophosphate and pyridine. Series I was prepared from p‐phenylene bis(acrylic acid) with various hydroquinones. Series II was prepared from p‐phenylene bis (β‐cyano acrylic acid) with methylhydroquinone. Series III was prepared from 3‐methyl‐4‐aminophenol with p‐phenylene bis(acrylic acid) or p‐phenylene bis(β‐cyano acrylic acid), respectively. The phase behavior of these polymers was studied by differential scanning calorimetry (DSC), optical polarizing microscopy equipped with a heating stage, and wide‐angle x‐ray diffraction (WAXD). It was found that these polymers, except IIIb, exhibit thermotropic liquid‐crystalline properties and show threaded or Schlieren texture under the optical polarizing microscopic observation. Furthermore, the melting temperatures of these polymers were decreased in the range of 254–354°C by incorporating with p‐phenylene diacrylic group into the main chain. © 1993 John Wiley & Sons, Inc.