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Change in Filler Network and Nonlinear Viscoelasticity of rubbers

Change in Filler Network and Nonlinear Viscoelasticity of Ru...

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The 4th Pacific Rim Conference on Rheology

作者： Youji Satoh Shigeru Kagami Sheiichi Kawahara Yoshinobu Isono Department of Chemistry Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan The Yokohama rubber Co. Ltd Hiratsuka Kanagawa 254-8601 Japan Department of Chemistry Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan Department of Chemistry Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan

＜正＞ uncured, filled rubbers show remarkable nonlinear viscoelasticity as well as cured, filled rubbers. The nonlinearity may come from change in entanglement and filler network structures. Many people use dynamic modulus to characterize rubber materials. However, dynamic modulus cannot be defined at large strain amplitude. Hence we must study a viscoelastic function to be defined at large strain. In addition, we need another information to separate the effects of the change in entanglement and filler network structures on nonlinear viscoelasticity. In this work, we have measured relaxation modulus G（γ,t） and electrical resistivity p（γ,t） simultaneously for carbon black （CB）-filled, uncured SBRs in a wide range of strain. Electrical resistivity at equilibrium, p（0,t）, showed step-off like change at the threshold of CB loading based on particle size. The threshold of N330 CB exists between 20 and 35phr, indicating threshold for filler network formation should exist in the range of values in CB loading. Both G（γ,t） and p（γ,t） for the samples having CB loading to be higher than the threshold showed nonlinearity at the strain larger than shear strain γ=0.1, indicating rupture in filler network at large strain. The threshold shifted to lower CB content for fine CB（N220）, and no threshold was observed for coarse CB（N660） in the range measured from 20 to 50phr, indicating that the threshold depends on primary particle size. Moreover it has been found that filler network structures rupture easily when the CB content close to the threshold. Furthermore, recovery rate in filler network has been found to be very slow in comparison with that in entanglement structure.

关键词： uncured styrene-butadiene rubber filler-network nonlinear viscoelasticity electrical resistivity.

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