应力引发官能化EPDM/HDPE及其对PA66/EPDM/HDPE 共混物相形态和力学性能的影响

通过提高双螺杆挤出机螺杆转速的方法,研究了熔融挤出过程中高剪切应力对马来酸酐(MAH)官能化三元乙丙橡胶(EPDM)与高密度聚乙烯(HDPE)共混物的接枝率、熔体流动速率及凝胶含量的影响.随着双螺杆挤出机螺杆转速的增加,强烈的机械剪切应力引发EPDM/HDPE共混物大分子链的断链反应形成大分子自由基,从而引发接枝反应制...

STRESS-INDUCED FUNCTIONALIZED EPDM/HDPE AND ITS EFFECTS ON MORPHOLOGY AND MECHANICAL PROPERTIES OF PA66/EPDM/HDPE BLENDS

The functionalization reaction of ethylene-propylene-diene monomer rubber(EPDM) and high-density polyethylene(HDPE) with maleic anhydride(MAH) during melt extruding through the high shear stress induced initiation by increasing the screw rotation speed of twin-screw extruder and changing the reaction temperature was investigated.With increasing the screw rotation speed,the scission of EPDM and HDPE molecule chains can be caused to form macroradicals and the reaction of EPDM /HDPE with MAH can be realized.The functionalized product(EPDM /HDPE)-g-MAH with higher percentage of grafting and better melt flow rate and lower gel content was prepared.The effects of(EPDM /HDPE)-g-MAH as a compatilizer on the compatibility,morphology and the mechanical properties of PA66 /EPDM /HDPE blends were studied.The results showed that(EPDM /HDPE)-g-MAH greatly improved the compatibility of the blends.With an increase in(EPDM /HDPE)-g-MAH content in the blend,the size of minor component domains decreased greatly.And the Izod impact strength and elongation at break of the blends improved obviously.