Journal
POLYMER TESTING
Volume 30, Issue 5, Pages 557-562Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2011.04.009
Keywords
Viscoelasticity; Wet skid resistance; Correlation; Silica; Carbon black; Nanohardness
Funding
- National Natural Science Foundation of China [51073009]
- Program for New Century Excellent Talents in University [NCET-10-0202]
- National High Technology Research and Development Program of China (863 Program) [2009AA03Z338]
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The present article revisits the role of viscoelasticity in wet skid resistance (WSR) of rubber composites by comparing the effects of carbon black (CB) and silica on WSR. WSR was determined with a British Pendulum Skid Tester on a wet ground glass surface. Under shear and tensile modes, tan delta of the composites was measured at 0 degrees C and 10 Hz over a wide range of strain (0.7%-10%) via a dynamic mechanical analyzer. For CB-filled composites with nearly the same hardness, a high correlation coefficient (R(2) = 0.98) between WSR and tan delta under both shear (0.7%-10%) and tensile (4%-7%) modes was obtained. Tan delta at tensile strain of 4% was thus adopted as a parameter to characterize viscoelasticity. For rubber composites with rough surface, WSR and tan delta showed a high correlation in styrene butadiene rubber (SBR) composites individually filled with CB and silica, while for rubber composites with smooth surface, a high correlation was also observed but did not depend on the type of filler. Silica-filled SBR composites showed higher WSR, when compared with those filled with CB, mainly due to the higher nanohardness of silica. All the above results demonstrate that WSR can be predicted from viscoelasticity for composites with similar surface roughness and micro-hardness. (C) 2011 Elsevier Ltd. All rights reserved.
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