Effect of network heterogeneities on the physical properties of nitrile rubbers cured with dicumyl peroxide

• Published in: Journal of applied polymer science Vol. 103; no. 5; pp. 3377 - 3382
• Main Authors: GONZALEZ, L, RODRIGUEZ, A, MARCOS-FERNANDEZ, A, VALENTIN, J. L, FERNANDEZ-TORRES, A
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.03.2007; Wiley
• Subjects: Applied sciences; Chemical reactions and properties; crosslinking; Crosslinking, vulcanization; Exact sciences and technology; networks; nitrile rubber; Organic polymers; physical properties; Physicochemistry of polymers; vulcanization; physical properties; Molecular structure; Crosslink density; Temperature effect; Mechanical properties; Nitrile rubber; Experimental study; networks; Vulcanization; Heterogeneity; Hydrogenated nitrile rubber; Vulcanizate; Concentration effect; Reaction mechanism; crosslinking; Organic peroxide
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.24696

The scope of this study is to continue our earlier studies on the peroxide curing of diene elastomers. The effect of peroxide content and temperature on the curing and mechanical properties of NBR and H‐NBR rubbers with different acrilonitrile content was evaluated. Experimental evidence indicates that saturated rubbers behave as expected whereas in unsaturated nitrile rubbers ion of allylic hydrogen and addition to the double bonds can act as mechanism of crosslinking, the weight of each mechanism is dependent of DCP content and curing temperature. The addition mechanism produces densely crosslinked zones or clusters, generating a heterogeneous network with effect on the vulcanizate properties. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3377–3382, 2007