【摘要】 以聚对苯二甲酸乙二酯(PET)/蒙脱土(MMT)复合体系为基料,采用聚乙烯接枝马来酸酐(PE-g-MAH)、马来酸酐接枝聚乙烯辛烯弹性体(POE-g-MAH)以及聚丙烯接枝马来酸酐(PP-g-MAH)作为增韧剂,利用双螺杆挤出机进行熔融共混,研究了不同增韧剂对复合体系的力学性能、相容性和熔融结晶行为的影响。实验结果表明:加入增韧剂对PET/MMT复合体系具有良好的增韧效果,当POE-g-MAH加入量为30%时,缺口冲击强度为未加增韧剂时的2.4倍;红外表征显示,增韧改性可提高PET/MMT的相容性;XRD测试表明,增韧剂对PET/MMT复合材料的晶体结构没有影响,通过熔融增韧可提高其力学性能和加工性能;DSC结果显示,增韧剂的加入可使PET/MMT共混物的冷结晶温度降低;SEM结果表明,加入增韧剂可使界面之间的结合力变大,有效提高了PET/MMT共混体系的相容性。更多还原

【Abstract】 With PET/MMT composite system as the substrate,using polyethylene grafted maleic anhydride(PE-g-MAH),maleic anhydride grafted polyethylene octene elastomer(POE-g-MAH),and polypropylene grafted maleic anhydride(PP-g-MAH) as the toughening agent,melt blending them with a twin-screw extruder. We studied the effects of different toughening agents on the composite system′s mechanical properties,compatibility, and melt crystallization behavior. The results showed that adding the toughening agent into PET/MMT composite system had an excellent toughening effect.When the amount of POE-g-MAH added was 30%,the notched impact strength was 2. 4 times that without the toughening agent. Infrared characterization showed that toughening modification could improve the compatibility of PET/MMT. XRD results showed that the toughening agent had no effect on the PET/MMT composite crystal structure,and its mechanical properties and processing properties could be improved by melt toughening. DSC results showed that the addition of tougheners could reduce the cold crystallization temperature of PET/MMT blends. SEM results showed that adding tougheners could increase the bonding force between the interfaces,which effectively improved the compatibility of the PET/MMT blend system.更多还原