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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 a composite initiation method with high shear stress and addition of initiator, which was modified alone or mixed with CaCO 3. The influence of screw speed on the melt flow rate and grafting rate of POE-g-MAH at 175 ℃ was investigated by titrimetric analysis, infrared characterization and melt flow rate measurement. The effects of grafted elastomer and CaCO 3 on the mechanical properties of PP Performance, heat distortion temperature and Vicat softening point. The results show that the composite priming has better grafting effect than pure shearing stress. The PP / POE-g-MAH blend has a notched impact strength of 6.18 kJ / m2 at an elastomer loading of 30 phr, 2.6 times the Vicat softening point and the heat distortion temperature all showed a downward trend; the ternary blend material PP / POE-g-MAH / CaCO 3 had better impact strength than the binary blend material. When CaCO 3 dosage was 20 phr , The notched impact strength reaches the maximum value of 11.18 kJ / m2, which is 4.76 times of that of pure PP. Vicat softening point and heat distortion temperature first and then decrease.