Exploring a new method for high-performance TPSiV preparation through innovative Si–H/Pt curing system in VSR/TPU blends

Abstract

This article explores the positive impact of a homemade polyurethane block copolymer (PDMS-PU) compatibilizer on silicone rubber/polyurethane (VSR/TPU) systems. A novel method for preparing silicone thermoplastic vulcanizate (TPSiV) materials is introduced, using a hydrogenated silicone oil/platinum (Si–H/Pt) catalytic vulcanization system. This involves high-temperature premixing of VSR, Si–H, and TPU, followed by adding diallyl maleate (DAM) inhibitor and Pt catalyst during the cold roller stage. This method prevents premature cross-linking and ensures thorough mixing and interaction between VSR and TPU. The TPSiV material produced demonstrates high tensile strength (TS, 6.5 MPa), exceptional elongation at break (EB, 500%), good shape stability, stable viscosity under high temperature and shear conditions, excellent low-temperature resistance, and superior damping properties. This innovative preparation method offers significant insights and practical guidance for developing high-performance thermoplastic vulcanizates.

Keywords

• silicone rubber
• polyurethane
• diallyl maleate
• vulcanization system, microstructure
• high-performance