中文摘要：

脂肪酮在有水存在时具有较好的紫外接枝引发效果．对丙酮-水-乙醇为引发体系引发甲基丙烯酸甲酯（MMA）在低密度聚乙烯（LDPE）表面的紫外接枝反应进行了研究．讨论了丙酮浓度、水与乙醇体积比、单体浓度等对接枝的影响．在相同条件下，丙酮浓度为0．136mol·L^-1时聚乙烯表面接枝程度最高；MMA在聚乙烯表面的接枝量随着水含量的增加而明显增加，在水-乙醇体积比为1.5：1时接枝程度最高；接枝量随着单体浓度的增加而增大，在单体浓度为1．88mol·L^-1时接枝速度最快．并对接枝产物进行了红外光谱和SEM表征．

英文摘要：

Aliphatic ketones can be effective photoinitiators for photografting in the presence of water. The photografting of methyl methacrylate （MMA） onto low-density polyethylene （LDPE） surface initiated by an acetone-water-ethanol system was studied. The effects of acetone concentration, water-ethanol volume ratio, monomer concentration on photografting reaction were examined. Under identical experimental conditions, highest grafting was obtained at an acetone concentration of 0. 136 mol·L^-1 ; grafting increased with increasing water content, with highest grafting obtained at a water-alcohol ratio of 1.5 ： 1; grafting also increased with increasing monomer concentration, with fastest grafting reaction obtained at a monomer concentration of 1.88 mol·L^-1. FTIR and SEM characterizations of grafted samples were carried out.