HDPE辐照接枝AA与SSS体系阻聚剂用量对接枝率的影响

考察了预、共辐照两种接枝方法中阻聚剂硫酸铜和摩尔盐对接枝率的影响规律。发现不同接枝方法的阻聚剂硫酸铜和摩尔盐对接枝率有着不同的影响规律。共辐照接枝体系中加入相同量的阻聚剂时，摩尔盐的阻聚效果明显弱于硫酸铜。空气气氛预辐照接枝时，较高反应温度下接枝率随摩尔盐用量的增加呈下降趋势，而反应温度较低时，随着摩尔盐用量的增加接枝率先升高，出现峰值后又降低。这是因为在摩尔盐的催化下，过氧化物可以在较低的温度下分解产生烷基自由基，从而引发接枝反应。

The effect of inhibitors on grafting yield in the system of AA and SSS radiation-induced grafting onto HDPE

The influence of inhibitor concentration on the grafting yield was studied in different grafting system. It was found that different inhibitors had distinct effect on grafting yield in preirradiation or mutual irradiation method. In mutual irradiation method, Mohrs salt is much weaker than bluestone in inhibiting homopolymerization with the same wt%. At high temperature, the grafting yield decreases with increasing concentration of Mohrs salt, but increases at low temperature in some range of Mohrs salt concentration. It can be interpreted that in the presence of Fe2 diperoxides and hydroperoxides may decompose at low temperature to form radicals which can initiate the grafting.