Abstract
A new phosphorus-containing poly(ester imide) was prepared by polycondensation reaction of a diamine containing a phthalonitrile unit, namely 4,4'-diamino-4 ''-(3,4-dicyanophenoxy)triphenylmethane, with an aromatic dianhydride having preformed ester groups, namely 1,442-(6-oxido-6H-dibenz < c,e >< 1,2 > oxaphosphorin-6-yl)]-naphthalene-bis(trimellitate)dianhydride. This polymer was easily soluble in polar aprotic solvents such as N-methyl-2-pyrrolidinone, N,N-dimethylacetamide, N,N-dimethylformamide or dimethyl sulfoxide. The poly(ester imide) showed high thermal oxidative stability, the decomposition temperature being above 360 degrees C, and high transition temperature, around 252 degrees C. The thermal decomposition behavior was studied using thermogravimetric analysis in air, at several heating rates between 4 and 19 degrees C/min. The kinetic processing of the data was carried out using ASTM-E1641 method.