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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得具有较高接枝率、较好熔体流动速率和较低凝胶含量的官能化产物(EPDM/HDPE)-g-MAH.并将(EPDM/HDPE)-g-MAH与PA66进行共混,研究了共混体系的相容性、相态及力学性能.结果表明,(EPDM/HDPE)-g-MAH的加入大大改善了PA66/EPDM/HDPE体系的相容性,且随其含量的增加,分散相的粒径明显降低.共混物的韧性及延展性大大提高,而其拉伸及弯曲性能基本保持良好,共混物的成本也有所下降.
The effects of high shear stress on the MAH functionalized EPDM and high density polyethylene (HDPE) blends were studied by increasing the screw speed of the twin screw extruder. , The melt flow rate and the gel content.With the increase of the screw speed of the twin-screw extruder, the strong mechanical shear stress caused the chain scission reaction of macromolecular chains of EPDM / HDPE blends to form large (EPDM / HDPE) -g-MAH with high grafting rate, good melt flow rate and low gel content were obtained through the grafting reaction, and (EPDM / HDPE ) -g-MAH was blended with PA66 to study the compatibility, phase behavior and mechanical properties of the blends.The results showed that the addition of (EPDM / HDPE) -g-MAH greatly improved the PA66 / EPDM / HDPE system , And with the increase of its content, the particle size of the disperse phase decreased obviously.The toughness and ductility of the blends were greatly improved, while the tensile and flexural properties of the blends remained well and the cost of the blends decreased .