中文摘要：

以过硫酸铵为引发剂，研究了酸解氧化淀粉与醋酸乙烯酯的接枝共聚反应，并探讨了过硫酸铵的氧化和引发机理；红外光谱验证了接枝共聚反应的发生．实验结果表明，在固定淀粉和单体用量的基础上，引发剂用量、酸解氧化时间、PH值、接枝反应温度和反应时间、单体滴加时间等因素都对接枝共聚反应和接枝产物的性能产生影响．当过硫酸铵浓度为30mmol／L、酸解氧化时间为1h、pH值为3．5左右、反应温度在糊化温度以下，即70℃左右、反应时间为3h左右、单体滴加时间为1．5h时，接枝共聚产物的接枝百分率和接枝效率最大。

英文摘要：

Reaction of grafting copolymerization of vinyl acetate onto acid-thinned and oxidized starch using ammonium persulfte as initiator was investigated. Oxidative and initiating mechanisms of ammonium persulfate were discussed. The grafting copolymerization of vinyl acetate onto acid-thinned and oxidized starch was determined by infrared spectrum. Under fixed quantities of starch and monomer, the effects of initiator, time of acid-modification and oxidation, pH, temperature, grafting reaction time, and the time of dripping monomer on the graft copolymerization of starch were analyzed. The results showed the optimal condition of the reaction were： the ammonium persulfte concentration of 30 mmol/L, acid-modification and oxidation time of 1 h, pH 3.5, grafting reaction temperature of 70℃, grafting reaction time of about 3 h and monomer-dripping time of 1.5 h.