SYNTHESIS, STRUCTURE-PROPERTY RELATIONS AND LYOTROPIC BEHAVIOR OF PERFLUOROALKYL-SUBSTITUTED PARA-LINKED AROMATIC POLYAMIDES

A series of perfluoroalkyl-containing para-linked aromatic polyamides based on trifluoromethyl-p-phenylenediamine and a mixture of trifluoro methyl- and pentafluoroethyl-substituted terephthalic acid have been s ynthesized. The polyamides were prepared by a low temperature solution polycondensation of aromatic diacyl chlorides with N,N'-bis(trimethyl sily)-substituted aromatic diamines. The influence of these perfluoroa lkyl substituents on thermal properties, solubility and lyotropic beha vior is discussed. F-19 NMR spectroscopy was utilized for molecular we ight determination and for further examination of the polymer structur e.