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

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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)
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Link to this item:http://purl.utwente.nl/publications/72335
Official URL:http://dx.doi.org/10.1002/app.25088
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