Studies on thermotropic liquid crystalline polymers part XIII. Synthesis and properties of fully aromatic liquid crystalline poly(amide-ester)s

Abstract

Four series of novel fully aromatic thermotropic liquid crystalline high molecular weight poly(amide-esters were prepared by direct polycondensation from terephthalic acid (TPA) and 2,6-naphthalene dicarboxlic acid with various aromatic diols and diamines in the presence of diphenyl chlorophosphate (DPCP), LiCl, and pyridine. The structures and thermal properties of the synthesized poly(amide-ester) s were examined by FTIR spectrum, wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermal optical polarized microscope and thermogravimetric analysis (TGA). The effects of the amounts and kinds of the aromatic diols and diamines (bisphenyl units, naphthalene and (un)substituted phenylene structures) on the molecular weight and thermal properties of the synthesized poly (amide-ester) s were investigated in this study. When a portion of the amide groups were replaced with the ester groups, most of the synthesized poly(amide-ester)s containing naphthalene or substituted hydroquinone units showed excellent mesophase and thermal stability, but the poly(amide-ester)s containing bisphenyl structures lost the mesophase behaviors. The P3 series of poly(amide-ester)s derived from TPA and 2,6-naphthalene dicarboxlic acid with phenylhydroquinone and various diamines possess liquid crystalline properties, even some of the diamines containing kink structures.