POLY(AMIDEIMIDE)S BASED ON DIAMINES CONTAINING BISARYLOXY GROUPS - STRUCTURE-PROPERTIES RELATIONSHIPS

A series of random poly(amideimide)s (PAIs) were prepared from 1,2,4-b enzenetricarboxylic acid monoesters and multi-ring diamines containing bisaryloxy groups by a 'one pot' method using the triphenylphosphite/ pyridine system. The diamines differ because of the para or meta caten ation and because of the presence of lateral substituents or bulky iso propylidene or perfluoroisopropylidene groups connecting two phenyl ri ngs. The prepared PAIs were characterized by Fourier transform infra-r ed and H-1 nuclear magnetic resonance spectroscopy. Thermal analysis a nd X-ray diffraction experiments indicated that all PAIs 'as polymeriz ed', are amorphous and that polymers having a prevailing para-orientat ion and no substituents crystallize upon thermal treatments. The glass transition temperatures (T(g)s) determined by differential scanning c alorimetry and dynamic mechanical thermal analysis, range between 178 degrees C and 253 degrees C. Both the T-g and the solubility, in polar aprotic solvents, are strongly affected by the chemical structure of the polymers. Flexible and tough films were obtained by solution casti ng or, in the case of amorphous PAIs, by compression moulding. The PAI s investigated exhibit thermostability-10% weight loss at T greater th an or equal to 495 degrees C-as shown by dynamic thermogravimetric ana lysis. Copyright (C) 1996 Elsevier Science Ltd.