Abstract
New phosphorus-containing poly(ester imide)s were prepared via polycondensation in solution of 1,4-bis[N-(4-hydroxyphenyl)phthalimidyl-5-carboxylate]-2-(6-oxido-6H-dibenz<c,e><1,2>oxaphosphorin-6-yl)-naphthalene with different aromatic dicarboxylic acids using a SOCl2/pyridine condensing agent. The polymers showed high thermal stability having a decomposition temperature above 375 °C and char yield at 700 °C in the range of 54—56%. The glass transition temperature was in the range of 190—226 °C. Solutions of the polymers in N,N-dimethylformamide showed fluorescence having maximum emission wavelength in the range 405—425 nm. The polymers exhibited thermotropic liquid crystalline behavior.
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