衣康酸接枝LLDPE/HDPE的制备与性能

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.利用红外光谱表征了接枝反应,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.

Preparation and Performance of Itaconic Acid Grafted LLDPE/HDPE

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.