An experimental study of the degradation of a commercial-grade filled natural rubber was conducted. Various temperature histories were investigated for which stress relaxation occurred due to viscoelastic and scission processes. A multi-network model in the framework of finite elasticity will be presented that includes the effects of entropic stiffening, thermal expansion, viscoelasticity, scission, recrosslinking, and oxygen diffusion/depletion. The results of a numerical simulation scheme to predict the mechanical response for arbitrary temperature and stretch histories are compared to uniaxial experimental results.
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