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

Wiley - Tập 103 Số 4 - Trang 2538-2546 - 2007
Kannika Sahakaro1,2, Nityananda Naskar1,2, Rabin Datta1,2, J. W. M. Noordermeer1,2
1Department of Rubber Technology, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, the Netherlands
2Dutch Polymer Institute (DPI), 5600 AX Eindhoven, the Netherlands

Tóm tắt

AbstractEPDM 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. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103:2538–2546, 2007

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Wiley

Tập 103 Số 4

2538-2546

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