共单体促进聚乙烯熔融接枝硅氧烷的研究

Study on the comonomer-promoted polyethylene melt grafting siloxane

以低密度聚乙烯和线性低密度聚乙烯为基体,研究了两种共轭效应大于3-(甲基丙烯酰氧基)丙基三甲氧基硅氧烷(KH570)、极性效应与KH570差值较大的共单体N-苯基马来酰亚胺(N-PMI)和甲基丙烯酸-2-羟基丙酯(2-HPMA)的加入对聚乙烯(PE)接枝硅氧烷KH570的影响。利用红外光谱分析证实了PE已经成功接枝了硅氧烷KH570和共单体,熔体流动速率、接枝率、凝胶率测试结果表明,两种共单体的加入,均能提高PE接枝硅氧烷的效果,而且N-PMI促进接枝的效果明显优于2-HPMA。当KH570用量为0.84g,共单体N-PMI和2-HPMA用量分别为0.84g和1.26g时,产物接枝率达到最大,分别为1.23%和0.85%。

Using low-density polyethylene and linear low-density polyethylene as the matrix,the influences of two comonomers,N-phenylmaleimide(N-PMI)and 2-hydroxypropyl methacrylate(2-HPMA)with larger conjugation effects than 3-(methacryloyloxy)propyltrimethoxysiloxane(KH570)and different polarity effect from KH570,on the grafting of polyethylene(PE)with siloxane KH570 were studied.Infrared spectroscopy(FT-IR)confirmed that PE had been successfully grafted with siloxane KH570 and comonomer.The results of melt flow rate,grafting ratio and gelation ratio tests showed that the addition of two comonomers improved the grafting effect of siloxane with PE,and the effect of N-PMI in promoting grafting was obviously better than that of 2-HPMA.When the dosage of KH570 was 0.84g,and the dosages of comonomers N-PMI and 2-HPMA were 0.84g and 1.26g,respectively,the grafting rate of the product reached the maximum value of 1.23%and 0.85%,respectively.