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- W2019985100 abstract "The time dependence of stress in simple extension of polyisobutylene (viscosity‐average molecular weight 2.3×106) was measured for extension at various rates to a stretch ratio λ=1.5 followed by relaxation at constant λ. The course of relaxation was independent of initial stretching rate after a time interval of approximately three times the time required to reach λ=1.5. In a series of partial relaxation experiments at stretch ratio λ0=2.0, the stress was allowed to relax for periods from 100 to 1.3×105 sec and the sample was then released by cutting; the recovery after a time interval δ of either 5 or 15 sec was measured. The stretch ratio λs corresponding to this point of initial recovery agreed closely with that calculated on the basis of a two‐network model in which an entanglement network with reference state λ=1 is gradually replaced by another with reference state λ=λ0 during relaxation, while the total concentration of entanglement strands remains constant. The old network (in extension at λs) is described by a Mooney‐Rivlin formulation and the new network (in compression at λs) is neo‐Hookean. The Mooney‐Rivlin Coefficients C1(t) and C2(t) required for the calculation are obtained from parallel experiments of stress relaxation at various stretch ratios." @default.
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- W2019985100 title "Nonlinear Stress Relaxation of Polyisobutylene in Simple Extension and Recovery After Partial Relaxation" @default.
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