水悬浮体系中苯乙烯和马来酸酐接枝聚丙烯改性研究

采用过氧化苯甲酰（BPO）为引发剂，通过水相悬浮法制备苯乙烯（St）和马来酸酐（MAH）双单体接枝聚丙烯（PP-g-St/MAH）。考察St加入量对接枝反应的影响，通过熔体流动速率和水接触角测试分析接枝产物的性能，采用X射线衍射和红外光谱分析表征接枝产物的结构。结果表明，随St加入量的增加，MAH接枝率升高，在St/MAH为3/1时，MAH接枝率为3.10 %，接枝效率高达70.02 %。随着接枝率的增加，接枝产物的熔体流动速率减小，PP主链间相互缠绕作用增强，熔体强度增大，结晶度降低，亲水性改善。

Study on Styrene and Maleic Anhydride Grafted Polypropylene in Water Suspension System

Styrene and maleic anhydride grafted polypropylene (PP-g-St/MAH) was prepared via a water suspension grafting process. The effect of ST dosage on the grafting reaction was investigated using melt floe rate, water contact angle, X-ray diffraction, and Fourier transform infrared spectroscopy. It showed that the graft ratio of MAH increased with increasing ST dosage. When the weight ratio of St/MAH was 3/1, the graft ratio was 3.10 % and graft efficiency reached 70.02 % With increasing grafting ratio, the MFR value decreased, melt strength increased，crystallinity lowered, and hydrophilicity enhanced.