高锰酸钾引发甲基丙烯酸甲酯微乳液聚合  

Microemulsion Polymerization of Methyl Methacrylate Initiated with Potassium Permanganate

作　　者：李晓[1] 夏声平[1] 肖少春[1] 张卫英[1] 

机构地区：[1]福州大学化学化工学院,福建福州350002

出　　处：《应用基础与工程科学学报》2005年第3期247-253,共7页Journal of Basic Science and Engineering

基　　金：福建省自然科学基金(No.E0410010)

摘　　要：以高锰酸钾为引发剂,采用膨胀计法,对十二烷基硫酸钠与乳化剂OP协同稳定的甲基丙烯酸甲酯O/W型微乳液体系的聚合进行了研究,考察了引发剂种类、反应温度、引发剂浓度、单体浓度及AA/MMA质量比对微乳液单体转化率及聚合速率的影响,结果表明:相对于油溶性的偶氮二异丁腈,水溶性的高锰酸钾和过硫酸钾引发微乳液聚合的速率较快且转化率较高;反应温度升高,聚合速率及最终转化率先增加后减小,35℃以上聚合时的表观活化能为-82.7kJ/mol;高锰酸钾浓度增大,聚合速率及最终转化率逐步增至最大值并趋于稳定;随单体浓度以及AA/MMA质量比的增加,聚合速率及最终转化率存在峰值;此外,条件适宜可以观察到比较明显的恒速期.The study of polymerization in methyl methacrylate（MMA）/acryhc acid（AA） oil-in-water microemulsions stabilized by sodium dodecyl sulfate and OP emulsifier was carried out by using dilatometry with potassium permanganate as initiator. The influence of initiator type, reaction temperature, the concentration of initiator or monomer and the mass ratio of AA to MMA on the monomer conversion and the rate of polymerization was investigated. The results showed that the monomer conversion and the rate of polymerization using potassium permanganate as initiator was similar to that using potassium persulphate but much higher than that using 2.2＇- azobisisobutyronitrile. Keeping the constant composition of microemulsion, the rate of polymerization and final conversion increased first and then dropped with increasing temperature, and the total apparent active energy was -82.7kJ/mol above 35℃. The rate of polymerization and final conversion increased and reached maximum with increasing the concentration of potassium permanganate. And peak polymerization rate and maximal final conversion ap In addition, conditions. with increasing the concentration of monomer or the ratio of AA to MMA. the period of constant rate during polymerization was observed at appropriate

关 键 词：高锰酸钾 微乳液聚合 动力学 甲基丙烯酸甲酯 引发剂 

分 类 号：TQ316[化学工程—高聚物工业] O631[理学—高分子化学]