Optimizing maleic anhydride content to enhance mechanical performance and thermal stability of recycled polyolefin blends

Abstract

This study evaluated the effects of maleic anhydride (MA) coupling agent on the mechanical and thermal properties and long-term stability of post-consumer recycled (PCR) plastics. The addition of MA coupling agent increased the tensile strength by 32.12%, enhancing the mechanical durability of the recycled plastic. Furthermore, the melt index (MI) increased by 366.23%, significantly improving processability. Thermogravimetric analysis (TGA) results showed a significant improvement in thermal stability, and a lifetime prediction model estimated an extension of the material’s life by 532.66% at 200 °C. These results demonstrate that MA coupling agent effectively suppresses long-term degradation at high temperatures. Therefore, MA coupling agents can simultaneously improve mechanical properties and recyclability and offer a potent solution for creating sustainable plastics within a circular economy.