Rheological Behavior of Thermoplastic Vulcanizates



Summary: Dynamic and steady shear rheological properties of dynamically vulcanized iPP/EPDM blends were investigated. Two different curing systems based on sulfur or phenolic resin were applied on iPP/EPDM blends. The use of phenolic resin system allows producing materials with lower viscosity at higher rubber content in comparison with sulfur-cured compositions. Melt rheological properties of iPP/EPDM blends with different loading levels of paraffinic oil were studied. Significant improvement in the flowability is observed for TPVs extended with 50 wt% oil. A partial replacement of EPDM on rubber powder decreases the viscosity of materials.