EPR IMAGING STUDY OF PARAMAGNETIC CENTER DISTRIBUTION IN THIOKOL-EPOXY HERMETICS

The distribution of paramagnetic centres in carbon black filler in the interphase layer of the thiokol-epoxy hermetics on the border of bras s or glass substrate was studied using EPR-imaging method. It was show n that the relative content of radicals decreases near the hermetic-'' rigid'' surface contact border. The thickness of the layer with a low concentration of radicals is estimated as 0.5 +/- 0.3 mm. The inhomoge neous distribution of radicals is more obvious in the case of hermetic hardening on a brass surface. These results are explained by a cataly tic acceleration of the thiokol-epoxy polymerization reaction in the r egion of hermetic-metal surface contact.