[Polymer materials for biomedical use obtained by radiation methods. III. Radiation cross-linking of acrylamide and N-vinylpyrrolidone].

The course of the radiation formation of hydrogels in aqueous solutions of acrylamide and N-vinylpyrrolidone was investigated on the base of gel-sol analysis. Using relations from Inokuti's equation as a test of crosslinking mechanism it was pointed out that creation of gels takes place according to classical mechanism e.g. through four-functional joining points. In the systems containing oxygen gel formation results from simultaneous crosslinking and degradation. On the base of swelling measurements of gels (ROCH method) the yields of radiation processes were calculated. Using a method of pulse radiolysis the absorption spectra of macroradicals were recorded, their structures discussed and the rate constants of crosslinking estimated.