不同螺杆构型下充满度与接枝反应接枝率关系的研究

Influence of Filling Ratio on the Grafting Ratio of PE-LD-g-MAH Prepared by Reactive Extrusion Using Different Screw Configurations

研究了不同螺杆构型下的充满度以及低密度聚乙烯(PE-LD)熔融接枝马来酸酐(MAH)的过程,探讨了不同螺杆构型下充满度与接枝反应挤出过程的关系。用酸碱滴定法对样品的接枝率进行了测定,并采用剖分机筒对主反应区物料在流道中的充满程度进行了研究。结果表明:物料的熔融终了点和主反应区的充满度对接枝反应率有较大的影响。熔融终了点越靠近加料口,接枝反应开始越早,其上游的接枝率也就越大。充满度越高,所对应的接枝率增长量也就越大。

The filling ratio and the grafting of MAH onto PE-LD during an extrusion using co-rotating twin screws with different configurations have been investigated, and the effect of filling ratio on the grafting degree has been discussed. The grafting degree of the specimens that was taken from upstream and downstream reaction zone was determined by titration. The filling ratios in the main reactive zones were estimated by clam barrel for different screw configurations. It showed that the filling ratio and the location of the melting endpoint along the screw had major influences on the grafting degree. The nearer the location of the melting endpoint to the feeding port, the earlier the grafting reaction started, the higher the grafting degree obtained in upstream zones. The higher the filling ratio, the greater the grafting degree obtained at the same sampling point.