探讨了以水为分散介质 ,玉米淀粉的季铵型阳离子化学改性的各种反应条件对转化率 (阳离子试剂与玉米淀粉结构中的羟基反应的比例 )和取代度 (阳离子试剂取代伯羟基的比例 )的影响。实验结果表明 :当玉米淀粉与阳离子试剂的摩尔比为 1∶1,pH值 9～ 10 ,反应温度 5 0℃ ,反应时间 6h ,转化率和取代度可分别达到 75 %和 0 75 . The effects of various reaction conditions on the chemical modification of quaternary ammonium cations of cornstarch with water as the dispersion medium were investigated. The conversion (the ratio of the cationic reagent to the hydroxyl groups in the cornstarch structure) and the degree of substitution (the cationic reagent substituted for the primary hydroxyl group Ratio) of the impact. The experimental results show that when the molar ratio of corn starch to cationic reagent is 1: 1, pH value is 9-10, reaction temperature is 50 ℃ and reaction time is 6h, conversion and substitution degree can reach 75% and 75% respectively.