SYNTHESIS AND CHARACTERIZATION OF POLY(PHTHALAZINONE ETHER PHOSPHINE OXIDE)S BY N-C COUPLING REACTION

Based on several unsymmetrical,twist,noncoplanar phthalazinone-containing monomers 2a-2e and an active bis（4-fluorophenyl）phenyl phosphine oxide（BFPPO） monomer,a series of novel poly（phthalazinone ether phosphine oxide）s （PPEPO） was synthesized by anhydrous K;CO;mediated N—C coupling reaction in DMAc.The polymers exhibited good thermal properties with T;s ranging from 267℃to 306℃and 5%weight loss temperatures in nitrogen higher than 430℃, together with high char yield upon prolonged heating at 800℃（35%—56%）.Moreover,the polymers were readily soluble in common organic solvents,such as N-methyl-2-pyrrolidone,chloroform and m-cresol.These polymers had inherent viscosities in the range of 0.45-0.72 dL/g and could be cast into flexible and colorless films by spin coating or casting approach.