Melt grafting of poly (ethylene-vinyl acetate) copolymer with maleic anhydride

Yin Jun（College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China）　
Zhang Jun（College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China）　

聚乙烯 -醋酸乙烯酯共聚物与马来酸酐的熔融接枝

尹骏　 张军　

摘　要：在双螺杆挤出机中进行了聚乙烯 -醋酸乙烯酯共聚物与马来酸酐的接枝反应,通过红外分析证实了接枝产物的存在.研究了醋酸乙烯酯质量分数、引发剂种类及接枝单体和引发剂用量对接枝反应的影响.结果表明,相对于 100份乙烯醋酸乙烯酯,接枝单体和引发剂用量分别为 2和 0.3份较为适宜 .
关键词：聚乙烯-醋酸乙烯酯共聚物;马来酸酐;熔融接枝
CLC Number：TQ32　Document ID：B

　　Melt grafting of unsaturated monomers to polyolefin in the presence of organic peroxide as an initiator has received much attention in the past decade[1].However,the maleation of ethylene-vinyl acetate(EVA) copolymers has been mentioned few.Considering the presence of vinyl acetate (VA) groups in the EVA copolymers exerts a strong influence on the polarity,the melt functionalization of EVA using maleic anhydride (MAH) as graft monomer was studied.
　　The reactions of EVA copolymer and MAH were carried out at 200 ℃ ,100 r/min in twin-screw extruder in the presence of peroxide initiators.To understand the role of VA groups on the grafting reaction,EVA copolymer with two different mass fraction of VA(15% and 28% ) were chosen towards the melt reaction with MAH and the results are represented in Table 1. The MAH incorporation into EVA 28 was relatively lower than that into EVA 15;thus the grafting reaction was more effective with EVA 15 copolymer.Further,the behavior of the different types of peroxide precursors in the grafting reaction was studied. As shown in Table 2,the maleation of EVA copolymer prefers using DCP to initiate the reaction.
　　……

References：

［1］Vijayalakshmi N S,Murthy R A N.J Appl Polym Sci,1992,44(12):1 377～1 382

Manuscript Received：2001年11月9日

Published：2002年1月15日