Thermal imidization of PAA on the basis of 4,4′-diaminodiphenyloxide and pyromellitic dianhydride, modified by cinnamic,  acetylenedicarboxylic acids, 4,4'-bis-(dimethylamine)-benzophenone and active filler (SiO₂) is studied by IR-spectroscopy. The choice of modifying agents is caused by the assumption, that their use will lead to the formation intermolecular cross-linking in polymer and will prevent decrease in its properties eventually. The chosen quality of filler SiO₂ allows to consider positive effect achievement in creation of the filled material at the expense of its physical characteristics, particularly the specific surface and similarity in value factor of thermal expansion to similar parametre of the polymeric binding.

 Absorption spectrum of films removed on IR-spectrometer Nicolet 7101.

It is experimentally shown, that if to accept a degree of imidization of polyimide subjected to warming up to 320°С, for 100 % that the degree of imidization of polyimide, received by warming up of not modified film in the inert atmosphere at 200°С during 4 h achieves 82 %. Process of imidization of PAA, modified cinnamon and acetylendicarboxylic acids, practically does not differ from imidization of not modified PAA. At the same time the imidization of PAA, modified 4,4'-bis-(dimethylamine)benzophenone proceeds more quickly, achieving greater degree of completeness. Catalytic effect of this modifier leads to achievement of the same degree of imidization, that for not modified PAA at warming up at 200°С in an atmosphere of the drained nitrogen during1 h. As the experience implies, this routine of imidization of PAA may be using in cases of step rise of temperature up to 300-320°С for 2-3 h, which provide 100 % of imidization, can leads to degradation of properties of a product in which it is used polyimide. It is established, that the  higher the quantity of aerosyl enters to the PAA, the higher ­ will become the speed of the rising temperature to 320°С with formation of strong films.

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1. Thermal imidization of polyimide compositions
2. Film-forming metallic materials