Carbon black reinforced natural rubber/butadiene rubber and natural rubber/butadiene rubber/styrene-butadiene rubber composites: Part II. Dynamic mechanical properties and fatigue behavior
Engin Burgaz1,2, Okan Gencoglu2, Mert Goksuzoglu2,3
1Department of Metallurgical and Materials Engineering, Ondokuz Mayis University, Samsun TURKEY
2Department of Nanoscience and Nanotechnology, Ondokuz Mayis University, Samsun TURKEY
3SAMPA Automotive R&D Center, Tekkekoy, 55300 Samsun, Turkey
Carbon black reinforced rubber composite;
Dynamic mechanical properties;
Carbon black reinforced natural rubber (NR)/butadiene rubber (BR), NR/styrene-butadiene rubber (SBR) and NR/BR/SBR composites were prepared by using two types of BR with highly linear chain structure (higher viscosity and molecular weight) and branched chain structure (lower viscosity and molecular weight). NR/BR composite consisting of BR with higher viscosity has the highest fatigue strength. Damping factors of NR, NR/SBR and NR/BR/SBR composites as a function of frequency were systematically compared at constant temperatures of -40, 0, 25 and 60°C. Based on dynamic mechanical analysis (DMA) results, the elasticity of NR/carbon black composite improves, its heat buildup character and tan d decreases with the addition of BR. The addition of 20 phr BR to NR/SBR composites provides 4-5 times better fatigue strength due to the decrease of tan d. Lastly, using a higher viscosity BR in carbon black filled NR or NR/SBR is quite favorable in terms of using these composites as anti-vibrational rubber bushings in automotive applications where high fatigue resistance and lower damping factor are important criteria.
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