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EPR imaging study of paramagnetic centre distribution in thiokol-epoxy hermetics |
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| Authors: | E S Nefed’ev K M Musin T Yu Mirakova M K Kadirov K L Aminov K M Salikhov V A Silaev |
| Institution: | 1. Kazan Technological University, K. Marx Str. 68, 420015, Kazan, Russian Federation 2. Kazan Physical-Technical Institute, Kazan, Russian Federation 3. Kazan State University, Kazan, Russian Federation |
| Abstract: | The distribution of paramagnetic centres in carbon black filler in the interphase layer of the thiokol-epoxy hermetics on the border of brass or glass substrate was studied using EPR-imaging method. It was shown 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 inhomogeneous distribution of radicals is more obvious in the case of hermetic hardening on a brass surface. These results are explained by a catalytic acceleration of the thiokol-epoxy polymerization reaction in the region of hermetic-metal surface contact. |
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