Structure and property of IIR/PP thermoplastic vulcanizate. I: Effect of softening agent and filler on structure and property of IIR/PP TPV

The structure and properties of IIR/PP thermoplastic vulcanizates with different content of oil and silica were investigated, especially the rheological property and elasticity property. For the first time, the morphology was got by diluting the IIR/PP TPV using PP. The results showed that, the effect of oil on the flow property was very notable, oil could greatly improve the flow property of TPV, but the effect of silica on TPV mechanical properties was not evident. Based on this study, the new mechanism and idea for the effect of oil on flow property was brought forward, which was, during dynamic vulcanization, the crushing efficiency of rubber was enhanced by adding softening agent. At the same time, there was some oil migrated into PP, as the result, the viscosity of matrix decreased. It was because of above two efficiencies that the flow property of TPV was improved.