Dynamic Properties of Foam Rubbers:II. Effect of Temperature and Oxydative Degradation

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Dynamic viscoelasticity of foam rubbers, its temperature dependence, and the effect of oxydative degradation were studied at about 100 cycles/sec. The apparent activation energy for viscous process was determind from the temperature dependence of dynamic viseosity. The observed value, 2-4 kcal/mol, is much smaller than that of rubber matrix itself, 15-20 kcal/mol.<BR>The dynamic rigidity decreases and the viscosity increases at the first stage of oxydative degradation; and then both of them begin to increase at the last stage. The observed results are tentatively interpreted principally in terms of the colloidal higher-order structure of the porous rubber, rather than as the intrinsic properties of rubber matrix.
公益社団法人高分子学会の論文