The authors studied the functionalization reaction of high density polyethylene(HDPE) and ethylene-propylene-diene monomer (EPDM) blend (mass ratio of HDPE to EPDM=70 ?' 30) with maleic anhydride(MAH) initiated by high shear stress-inducement. The adopted method comprised the procedures of increasing the screw rotation speed of a twin-screw extruder or adding initiator while increasing the screw rotation speed in melt extrusion. The results show that the high shear stress resulted from high screw rotation speed induces the scission of molecular chains of the HDPE/EPDM blend to form macroradicals. Therefore, the grafting ratio and the melt flow rate of the functionalized product(HDPE/EPDM)-g-MAH increase obviously. The cross-linking as side reaction can be suppressed effectively and the reaction process can be controlled by changing the screw rotation speed. The obtained functionalized product has grafting ratio of 0.61%-1.27%, melt flow rate of 0.38-1.35 g/10 min and gel mass content less than 1.0%.%在熔融挤出过程中采用提高双螺杆挤出机螺杆转速的应力诱导引发和添加引发剂/提高螺杆转速的复合引发方法,研究了高密度聚乙烯(HDPE)和三元乙丙橡胶(EPDM)共混物(质量比为70∶30)与马来酸酐(MAH)的官能化反应.结果表明:双螺杆挤出机的高螺杆转速所产生的高剪切应力作用直接诱导了HDPE/EPDM大分子链的断链反应,形成大分子自由基,引起官能化产物的接枝率与熔体流动速率明显增大.通过改变螺杆转速可有效抑制交联副反应,控制反应过程,制备的官能化产物MAH接枝HDPE/EPDM的接枝率为0.61％～1.27％,熔体流动速率为0.38～1.35 g/10 min,凝胶质量分数小于1.00％.
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