Abstract
The addition of polymers such as polyethylene terephthalate, polycarbonate and polyurethane to another high molecular weight compound often provides improvement of properties of initial polymerfilms. These compounds can be successfully applied for obtaining of composite films based on polyimides. In the present work, conditions of making polymer composite films with arylalicyclic structured copolyimides and influence of polyethylene terephthalate on them were studied. It was found that, addition of component from 0.5 to 2 wt.% provides retaining of the polymers’ compatibility in the composite. Films formed from solutions of these compositions are transparent, brittleness of the material is not observed and there were little changes in elasticity compared with original copolyimide film. FTIR studies showed that the formation of these polymer blends leads to the interaction of functional groups of the polymers with hydrogen bonds, which determine the blend components compatibility. It has been found that, upon additional heat treatment of the films no more than 250°C, intermolecular crosslinking partially occurs with formation of an oxygen bridge between the amide acids of copolyimide and the added component. Such crosslinking provides increase of heat resistance and strength of the film. It should be noted that, for carrying out extensive research, it is preferable to use a simple method of mechanical mixing for components.
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