Authors: Zahra Rafiee Sedigheh Khalili
Publish Date: 2013/05/30
Volume: 70, Issue: 8, Pages: 2423-2435
Abstract
A new xanthenecontaining diamine monomer was successfully synthesized in four steps by the condensation of βnaphthol and 4nitrobenzaldehyde in the presence of ptoluenesulfonic acid catalyst reduction of the nitro intermediate the nucleophilic substitution reaction of amine compound and 35dinitrobenzoyl chloride and subsequent reduction of the dinitro compound The diamine monomer could be obtained in quantitative yield A series of novel organosoluble aromatic polyimides were prepared by direct polycondensation of synthesized diamine with four tetracarboxylic dianhydrides via a conventional twostep polymerization process The polymers were obtained in quantitative yields with inherent viscosities of 020–074 dL/g Most of the polymers dissolved in Nmethyl2pyrrolidone NNdimethylacetamide NNdimethylformamide and dimethyl sulfoxide The resulting polyimides exhibited good thermal stability no weight loss was detected before a temperature of 450 °C in nitrogen Wideangle Xray diffraction measurements showed that these polyimides were predominantly amorphous
Keywords: