ESR-INVESTIGATIONS OF THE THERMAL-OXIDATIVE AGING IN SBR

Citation
D. Hauck et al., ESR-INVESTIGATIONS OF THE THERMAL-OXIDATIVE AGING IN SBR, Kautschuk und Gummi, Kunststoffe, 50(5), 1997, pp. 392-397
Citations number
17
Categorie Soggetti
Polymer Sciences","Engineering, Chemical
ISSN journal
09483276
Volume
50
Issue
5
Year of publication
1997
Pages
392 - 397
Database
ISI
SICI code
0948-3276(1997)50:5<392:EOTTAI>2.0.ZU;2-D
Abstract
The thermal-oxidative aging of technical SBR vulcanizates was characte rized and monitored in ESR experiments. Under the thermal load the for mation of a long-lived radical species was observed. Different individ ual processes which superimposed to the complex aging process were inv estigated with respect to their dependence on temperature, crosslink d ensity, filler content and antidegradants. The thermally induced recom bination of radicals proved to be independent of crosslink density and carbon black content. The thermal-oxidatively induced formation of ra dicals followed two successive mechanisms. The first exhibited a stron g temperature dependence, the second was substantially affected by the variation of crosslink density.