The EPDM / PP TPV Compatibilized by the In Situ Reaction Product of Bio‐Based Itaconic Acid and Magnesium Oxide Possessed Shape Memory Performance

ABSTRACT EPDM/PP TPV compatibilized by the graft reaction of magnesium itaconate on EPDM and PP chains, which was derived from the in situ reaction of magnesium oxide and bio‐based itaconic acid, was successfully obtained. The compatibilized EPDM/PP TPV achieved better shape memory performance and mechanical property compared with the TPV without compatibilization. TPV‐4 obtained excellent mechanical property, with the tensile strength and elongation at break of 13.8 MPa and 773%. TPVs compatibilized by the graft products of MgIA owned a higher shape recovery ratio of above 85% compared to 72.6% of TPV‐0 without compatibilization. The good compatibility on EPDM and PP interphase was beneficial to the stress delivery that resulted in the outstanding shape memory property of the compatibilized TPV. On the other hand, the ionic interaction of the MgIA graft products in the compatibilized TPV could reinforce TPV, which generated better mechanical performance of TPV. The whole shape memory behavior of TPV‐6 measured by DMA was clearly presented in the stress–strain‐temperature curve, which further demonstrated the good shape memory performance of TPV. The results of SEM image, FTIR analysis, and DMA curve demonstrated the fine compatibility of EPDM and PP phase in the compatibilized TPVs.