Blending of NR/BR/EPDM by reactive processing for tire sidewall applications. I. Preparation, cure characteristics and mechanical properties

Sahakaro, Kannika and Naskar, Nityananda and Datta, Rabin N. and Noordermeer, Jacques W.M. (2007) Blending of NR/BR/EPDM by reactive processing for tire sidewall applications. I. Preparation, cure characteristics and mechanical properties. Journal of Applied Polymer Science, 103 (4). pp. 2538-2546. ISSN 0021-8995

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Abstract:	EPDM incorporated into blends of natural rubber/butadiene rubber (NR/BR) improves ozone resistance. In this work, the inferior mechanical properties of NR/BR/EPDM blends generally obtained by conventional straight mixing are overcome by utilizing a reactive processing technique. The entire amount of curatives, based on a commonly employed accelerator N-cyclohexyl-2-benzothiazole sulfenamide (CBS) and sulfur, is first added into the EPDM phase. After a thermal pretreatment step tuned to the scorch time of the EPDM phase, the modified EPDM is mixed with premasticated NR/BR. The reactive blend vulcanizates show a significant improvement in tensile properties: tensile strength and elongation at break, as compared to those prepared by straight mixing, in both gum and carbon black-filled blends. The increase of tensile properties in gum and filled reactive blend vulcanizates does suggest that the reactive processing technique leads to more homogeneous blends due to, either a better crosslink distribution, or more homogeneous filler distribution, or both.
Item Type:	Article
Copyright:	© 2007 Wiley InterScience
Faculty:	Engineering Technology (CTW)
Research Group:	Elastomer Technology and Engineering (ETE)
Link to this item:	http://purl.utwente.nl/publications/72335
Official URL:	http://dx.doi.org/10.1002/app.25088
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