A new ionic cross-linking network type high hysteresis oil resistant ACM/POM TPV preparation method and performance research

Herein, the concept of ionic cross-linking was first introduced into the preparation of thermoplastic vulcanizates (TPV). Oil-resistant TPV was developed based on acrylate rubber (ACM) and polyoxymethylene formaldehyde (POM) using Ca(OH)2 as the cross-linking agent. The physical and mechanical properties, aging resistance, dynamic mechanical properties, micromorphology, and energy loss of the composites under covalent cross-linking networks and ion cross-linking networks with different degrees of cross-linking were systematically studied. The results showed that Ca2+ could form metal ion binding with the -COOH of ACM, playing a cross-linking role for ACM. Compared with the covalent bonding system, the 100% constant tensile stress of TPV in the ionic bonding system can be increased by 31% and the elongation increased by 14.5%. And exhibits better elasticity and lower hysteresis loss below 140 °C. The increase in dispersed phase modulus increases the phase domain of dispersed phase, weakens the binding with matrix, weakens the tensile strength, increases the intrusion of hot oxygen and hot oil, increases the energy storage modulus, and decreases the loss modulus.