POE-g-MAH和CaCO_3协同增韧增强PP复合材料的研究

Research on PP Composites Toughened and Reinforced by POE-g-MAH and CaCO_3

采用高剪切应力和添加引发剂的复合引发方法制备了POE-g-MAH,将其单独或与CaCO_3混合后改性PP。通过滴定分析、红外表征和熔体流动速率测定方法研究了175℃条件下螺杆转速对POE-g-MAH的熔体流动速率、接枝率的影响,探讨了接枝弹性体和CaCO_3对PP力学性能、热变形温度和维卡软化点的影响。结果表明:复合引发比单纯剪切应力引发接枝效果好;二元共混材料PP/POE-g-MAH在弹性体用量为30 phr时缺口冲击强度达到6.18 k J/m2,是纯PP的2.6倍,维卡软化点和热变形温度均呈下降趋势;三元共混材料PP/POE-g-MAH/CaCO_3比二元共混材料具有更好的冲击强度,在CaCO_3用量为20 phr时,缺口冲击强度达到最大值11.18 k J/m2,是纯PP的4.76倍,维卡软化点和热变形温度呈先上升后下降的趋势。

POE-g-MAH was prepared by high shear stress and additive initiation method, and PP was modified by initiator or mixed with CaCO3. The effects of rotating speed of screw on grafting level and the melt flow rate were studied by titration analysis, FT-IR, and determination of melt flow rate at 175℃. The effects of grafted elastomer and CaCO3 on mechanical properties, hot deformation temperature and softening point of PP were investigated. The results show that the grafting effect of composite initiation is better than that of pure shear stress; the notched impact strength of PP/POE-g-MAH blends is 6.18 k J/m2 and 2.6 times of pure PP when the content of elastomer is 30 phr, the softening point and thermal deformation temperature show a downward trend; the notched impact strength of PP/POE-g-MAH/CaCO3 ternary composites is better than that of PP/POE-g-MAH blends, which is 11.18 k J/m2 and 4.76 times of pure PP when the content of elastomer is 20 phr. The softening point and thermal deformation temperature show a trend of rising first and then decreasing.