Аннотация:Methods of modifying polyarylate based on bisphenol A and mixture of iso- and tereph-thalic acids by a representative of a promising class of polymers — polyarylene ether ketone have
been discussed in this article. Comparative thermomechanical and thermofriction tests of two
grades of poly(arylene ether ketone)based on bisphenol A and 4,4'-difluorobenzophenone (PAEK-32 and PAEK-34) have been carried out. It has been established that PAEK-34 is the most suitable
for modifying polyarylate, which is confirmed by its higher softening temperature and stable fric-tion coefficient at elevated temperatures. The thermomechanical properties and molecular mass
distribution of amorphous polyarylene ether ketone before and after pressing have been studied. It
has been established that during processing of poly(arylene ether ketone) PAEK-34 it’s molecular
weight increases from 123 to 178 thousand a.m.u. with simultaneous change in the character of
the molecular mass distribution from bimodal to unimodal. At the same time, there is a sharp de-crease in the content of the low molecular weight fraction from 23.32 to 7.2%. Theoretical compat-ibility of polyarethylene ether ketone PAEK-34 and polyarylate DV based on the theory of solubility
of substances has been studied. It was established that mixtures of these polymers are compatible
for any components’ ratio according to the calculation results. The thermomechanical character-istics of the mixtures obtained on the basis of polyarylate and polyarylene ether ketone have been
evaluated. It has been established that the growth of heat resistance of the mixture during pro-cessing is caused by intermolecular interaction of components with the formation of new chemical
compounds having a block-type copolymer structure. This was confirmed by the change in the na-ture of the molecular-mass distribution of the polymer mixture upon the transition of the pressing
temperature from 260 °C to 300 °C. It was established that the optimal conditions for the realization
of block-copolymer formation reaction are created at 300 °C.