Paper Title:
Filler Network Change and Nonlinear Viscoelasticity of Rubbers
  Abstract

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. Hence we must study a viscoelastic function to be defined at large strain. In addition, we need other information to separate the effects of the change in entanglement and filler network structures on nonlinear viscoelasticity. In this work, we have measured simultaneously relaxation modulus G(γ,t) and electrical resistivity ρ(γ,t) for carbon black (CB)-filled, uncured styrene-butadiene copolymers (SBRs) at wide range of strains. Electrical resistivity at equilibrium, ρ(0,t), showed step-like change at the CB loading between 20 and 35 phr, indicating threshold for filler network formation should exist in the range of values in CB loading. Both G(γ,t) and ρ(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.

  Info
Periodical
Advanced Materials Research (Volumes 11-12)
Main Theme
Edited by
Masayuki Nogami, Riguang Jin, Toshihiro Kasuga and Wantai Yang
Pages
729-732
DOI
10.4028/www.scientific.net/AMR.11-12.729
Citation
Y. Isono, Y. Satoh, S. Fujii, S. Kawahara, S. Kagami, "Filler Network Change and Nonlinear Viscoelasticity of Rubbers", Advanced Materials Research, Vols. 11-12, pp. 729-732, 2006
Online since
February 2006
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$32.00
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