Development of thermoplastic vulcanizates based on in situ synthesized thermoplastic polyurethane and acrylonitrile-butadiene rubber: the influence of the curing system

Abstract We prepared different thermoplastic elastomers (TPEs) using an internal mixer. investigated the properties of polyurethanes (TPUs) produced from prepolymers with various isocyanate content and two chain extenders to select most appropriate TPU matrix for preparing vulcanizates (TPVs). Based on results, we selected a prepolymer moderate (10%) more flexible 1,6-hexanediol as extender TPVs by dynamic vulcanization in situ TPU. The rubber phase was acrylonitrile-butadiene (NBR) peroxidic sulfuric curing accelerators. Dynamical mechanical analysis (DMA) results show that room temperature storage modulus decreases due phase. TPU/NBR-CBS TPV delayed action accelerator yields highest tensile tear strength elongation at break. TPU/NBR-DCP made peroxide-based blend shows similar significantly lower break strength. good can be explained long induction period, which allowed disperse before took place. In TPU/NBR-DCP, peroxide formed bonds not only but also between phases, is manifested high mixing torque result thermogravimetric (TGA).