衣康酸接枝LLDPE/HDPE的制备与性能

Preparation and Performance of Itaconic Acid Grafted LLDPE/HDPE

以线性低密度聚乙烯（LLDPE）和高密度聚乙烯（HDPE）为基体树脂，过氧化二异丙苯（DCP）为引发剂，衣康酸（ITA）为主接枝单体、苯乙烯（St）为共接枝单体，进行熔融接枝反应制备衣康酸接枝LLDPE／HDPE共混物．利用红外光谱袁征了接枝反应，并探究了LLDPE／HDPE不同配比、引发剂及接枝单体添加量对接枝产物的熔体流动性、与钢板的黏结性以及热性能的影响．通过红外光谱测试分析，表明衣康酸确实接枝到了PE大分子链上；研究结果表明：将LLDPE和HDPE以一定配比作为基体树脂，HDPE质量分数为40％～60％时，获得的接枝物的流动性、黏结性和耐热性等综合性能较好；确定了最佳的接枝配方为HDPE质量分数为50％的LLDPE／HDPE，m（ITA）：m（St）=1：1的ITA／St复配接枝单体添加量为1．50％，DCP添加量为0．15％，所制备的PE接枝产物的熔体流动性和黏结性能较佳．

By selecting LLDPE and HDPE as matrix resin, DCP as an initiator, ITA as the primary grafting monomer, and styrene as the co-grafting monomer, the grafted LLDPE/HDPE blend was made via melting grafting reaction method. Using infrared spectroscopy, the grafting reaction was characterized and evaluated. The effects of the different content of the initia- tor, the monomer and the different ratio of matrix resin LLDPE/HDPE on the melting flow rate, plate bonding strength and thermal performance were evaluated. The infrared spectroscopic analysis showed that the ITA did graft on PE macromole- cules. With a certain ratio of LLDPE/HDPE as a matrix resin, when the content of HDPE is 40% - 60%, the comprehensive performance is better. The optimum formulation is that the LLDPE/HDPE is 50/50, the complex grafted monomer content of ITA/St = 1/1 is 1.50%, and the content of DCP is 0.15%, under which the melting flow and the bonding strength of the PE grafted product is better.