A modification of polyacrylonitrile (PAN) was carried out. As a result, a polymer compatible (in contrast to common PAN) with polyamic acid (PAA) was obtained. PAA, PAN and their mixtures in solution and in film were investigated by viscomeUy, massspectrometric thermal analysis (MTA), TG and electron microscopy. The physico-mechanical characteristics of the corresponding composite films were obtained.The search for the paths of further imoprovement in physico-mechanical properties of polyimides (PI) and the desire of a better understanding of the mechanism of the processes controlling intermolecular interaction in the chains of this polymer explain the increasing interest in the study of the compositions of this polymer class both with low molecular weight organic compounds, i.e. with furyl alcohol (FA) [1] and with polymers, such as polyvinylpyrrolidone (PVP) and polyacrylonitrile (PAN) [2,3]. In this case, properties that are not characteristic of the initial components may appear. Thus, PAA PM in the composition with FA initiates its polymerization. The product of interaction between PAA and PVP subjected to imidization reveals a much higher adhesion to glass and metal and a much higher stability to water, alkalis and acids than the initial imidized PAA.According to the concepts of the authors of ref.[3], the nature of interaction between PAA and PAN in their mixtures is determined by the presence of nitrile groups in the latter, and the degree of modification depends on the PAA fraction in the composition.
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