摘要
以聚酰胺66 (PA66)为树脂基体,玻纤为增强填料,马来酸酐接枝乙烯-辛烯共聚物(MAH-g-POE)为增韧剂,通过双螺杆熔融共混挤出,制备增强尼龙66.利用增韧剂母粒和不同螺杆组合,控制MAH-g-POE在树脂基体中的微观尺寸.对样品进行差示扫描量热法(DSC)和扫描电镜(SEM)测试.结果表明,使用增韧剂母粒且加强螺杆剪切,可以降低分散相的尺寸,改善增韧剂在增强尼龙66中的分散.分散相尺寸降低后样品的悬臂梁缺口冲击强度可以提高约27％,拉伸强度可以提高约27％且材料的抗疲劳冲击次数也明显提高.
Abstract
A reinforced and toughened polyamide 66 was prepared with glass fiber and POE graft maleic anhydride as the reinforcement and toughening agent respectively by twin screw extrusion.The toughness and fatigue resistance performance of the composites were improved via a toughening masterbatch and by increasing the shear force of the screw element combination.The results from differential scanning calorimetry and scanning electron microscopy illustrates that the microscopic toughening agent is equally dispersed in the matrix by the proposed method.Finally,the notch impact strength of the composites is improved by about 27％,and the fatigue resistance impact values increase remarkably.
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