反应增容聚丙烯/废胶粉共混物的研究

Study on Polypropylene/Waste Rubber Powder Blends Compatibilized by Reactive Extrusion

按一定的次序将单体二乙烯基苯（DVB）、马来酸酐（MAH）、引发剂过氧化二异丙苯（DCP）与聚丙烯（PP）及废胶粉（WRP）等在高速混合机中混合均匀后，在双螺杆挤出机中就地反应增容制备PP／WRP共混材料，讨论了DVB／MAH／DCP的用量对PP／WRP共混物的拉伸强度、缺口冲击强度以及弯曲强度的影响。通过扫描电镜（SEM）分析了反应增容对PP／WRP共混物界面的影响。结果表明，双单体反应增容能有效抑制PP降解，改善共混物界面相容性，提高共混物的力学性能。当引发剂和双单体的质量分数分别为0．2％和3．0％，DVB／MAH的质量比为3～4时，PP／WRP共混物的综合性能最佳。

Divinyl-benzene （DVB）, maleic anhydride （ MA H ）, dicumyl peroxide （ DCP）, waste rubber powder （WRP） and polypropylene （PP） were mixed evenly in high-speed mixer and then compatibilized by in-situ reaction in a twin-screw extruder. Influences of loadings of DVB/MAH/DCP on tensile strength, notch impact strength and flexural strength were discussed in detail. The effects of reaction compatibilization on phase interfaces were analyzed by means of SEM. The results show that the increase in mechanical properties is attributed to the improved interface and the effective suppression of the degradation of PP by multimonomer reaction compatibilization. While the mass ratios of DCP and multi-monomer are 0.2%and 3.0% respectively, the best integrated performance of PP/WRP blends are obtained under the mass ratio of DVB/MAH between 3 and 4.