Heterochain polymers polycarbonates

The preparation of polymer materials based on heterochain polymer polycarbonates (PC), polyethers, polyethercarbonates (PFC) or joint mixtures of polycondensational and polymerisational polymers [PC with polymethyl methacrylate (PMMA)]. 

The reactions of polycondensation are the bases of producing the most important classes of heterochain polymers polyarylates, polysulfones, polyarylenesterketones, polycarbonates, polyamides and others [7-12],... 

Among the abundance of tested classes of substances, PCA is the only additive reliably protecting PSF from oxidation in concentrations below 0.3 wt.%. As expected, by analogy with polycarbonate and other heterochain polymers processed at temperatures about 300°C, classical primary antioxidants (hindered phenols and aromatic amines) are at most neutral (amines catastrophically color PSF), which proved existence of the effective inhibition temperature limit (120 - 125°C) [11, p. 218]. It is stipulated by activity of phenoxyl radicals in reactions with hydroperoxides. Commonly, all so-called non-chain inhibitors intensify... 

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