POLYANHYDRIDES .9. THERMOTROPIC POLY(ESTER-ANHYDRIDE)S DERIVED FROM NAPHTHALENE-2,6-DICARBOXYLIC ACID AND BIPHENYL-4,4'-DICARBOXYLIC ACID

Two series of thermotropic poly(ester-anhydride)s, LC-PEAs, were studi ed. The first series was prepared by polycondensation of naphthalene-2 ,6-dicarbonyl dichloride with silylated 4-hydroxybenzoic acid, silylat ed and substituted 4-hydroxybenzoic acids or silylated 6-hydroxy-2-nap hthoic acid. A second analogous series of LC-PEAs was prepared by mean s of biphenyl-4,4'-dicarbonyl dichloride. Most LC-PEAs were semicrysta lline materials with melting temperatures (T-m) in the range of 280-40 0 degrees C. All LC-PEAs formed a nematic melt above T-m, but due to t he high temperatures the isotropization was affected by thermal degrad ation.