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Thermal Aging Behaviors of Resole-Cured Rubber Composites  

Choi, Sung-Seen (Department of Applied Chemistry, Sejong University)
Ha, Sung-Ho (Department of Applied Chemistry, Sejong University)
Woo, Chang-Su (Korea Institute of Machinery and Materials)
Publication Information
Elastomers and Composites / v.40, no.4, 2005 , pp. 284-289 More about this Journal
Abstract
Changes of crosslink densities of resole-cured NR composites by thermal aging were studied. The thermal aging was performed at $50-90^{\circ}C$. The crosslink density change increased with increase of the aging temperature and then decreased. Level of the crosslink density change decreased with increase of the resole content. Increase of the crosslink density by the thermal aging was explained with the formations of new crosslinks by combination reactions of pendent groups terminated by resoles and crosslinking reactions by pendent groups having methylol or o-methylene quinone intermediate. And decrease of the crosslink density by the thermal aging was explained with the dissociations of the existing crosslinks having dimethylene ether linkages.
Keywords
rubber; thermal aging; resole curing; crosslink density;
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