PDM对硫化杜仲胶抗热氧老化性能的影响OA

N,N'-m-phenylenebismaleimide(PDM)was incorporated into Eucommia ulmoides gum(EUG)to prepare vulcanized EUG,and the effect of PDM on the thermal oxidative aging resistance of vulcanized EUG was investigated.The results showed that the introduction of PDM shortened the curing time and increased the crosslink density.An appropriate amount of PDM improved the thermal stability of the vulcanizates and significantly enhanced the retention rates of tensile strength and elongation at break after aging.After aging for 12 h and 24 h,the vulcanizates containing 2 phr PDM exhibited tensile strength retention rates of 89.85%and 72.52%,respectively,and the elongation at break retention rates of 91.64%and 74.83%,respectively,demonstrating the optimal thermal oxidative aging resistance.Scanning electron microscopy morphology observation also confirmed that the introduction of PDM alleviated the aging degree of the vulcanizates,indicating that PDM could improve the thermal oxidative aging resistance of vulcanized EUG.