乙烯-醋酸乙烯共聚乳液水解动力学研究Ⅱ.乳胶粒内部水解反应动力学  

THE KINETIC STUDIES OF HYDROLYSIS REACTION OF ETHYLENE VINYL ACETATE COPOLYMER EMULSION Ⅱ. INNER HYDROLYSIS OF COLLOID PARTICLE

作　　者：陈沛智[1] 赵奇志[1] 李小芹 李建宗[1] 

机构地区：[1]湖北大学化学与材料科学学院,湖北武汉430062

出　　处：《高分子材料科学与工程》2000年第5期52-56,共5页Polymer Materials Science & Engineering

摘　　要：当乙烯 -醋酸乙烯共聚物乳液 (EVA)胶粒表面水解完成后 ,水解反应将继续在胶粒内部进行 ,采用滴定法跟踪测试体系碱的浓度进行动力学研究 ,并建立一数学模型对其进行描述。研究表明 ,胶粒内部水解反应呈现前后两个阶段 ,反应速率主要由 OH-在胶粒内部的扩散速率所控制。前半阶段反应活化能为 5 3.2 1k J/ m ol,指前因子为1.5 2 5× 10 7min- 1 ,后半阶段反应活化能为 44 .86 k J/ mol,指前因子为 3.411× 10 5 m in- 1 。The kinetics of base catalyzed inner hydrolysis reaction of ethylene vinyl acetate copolymer emulsion(EVA) was studied by titration and a methematic model was established to describe it. The hydrolysis of inner EVA colloid particles proceed in servel steps and the reaction rate is controlled by diffusion rate of OH - in inner colloid particles. In the first step, the activation energy is 53.21 kJ/mol and the preexponential factor is 1.525×10 7 min -1 ; in the second step , the activation energy is 44.87 kJ/mol and the preexponential factor is 3.411×10 5 min -1 . The methanol can acclerate the reaction because of swelling effect.

关 键 词：EVA乳液 乙烯 醋酸乙烯 共聚乳液 水解动力学 

分 类 号：O632.12[理学—高分子化学]