Triply shape-memory polymeric system of trans-polyisoprene/paraffin through ionic crosslinking and covalent crosslinking

Abstract A triple-shape memory rubber featuring a two-component crystalline structure and a dual crosslinking system was synthesized by blending trans-polyisoprene with paraffin wax. The influence of zinc dimethacrylate (ZDMA) and dicumyl peroxide (DCP) content on the material's properties was systematically examined. The synthesized material was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), a rotorless vulcanizer, and a universal tensile tester. The optimal performance of the elastomer was achieved when ZDMA and DCP concentrations were 2 phr and 1 phr, respectively. The paraffin phase was embedded within the eucommia gum phase, with both phases crystallizing independently. The elastomer exhibited a tensile strength of 15.97 MPa. The findings indicate that the triple-shape memory elastomer possesses excellent overall properties, including a high recovery rate, rapid recovery time, and minimal risk of excessive crosslinking. The mechanical properties satisfy the performance requirements of triple-shape memory rubber.