合成了一种阳离子可聚合表面活性剂甲基丙烯酰氧乙基十二烷基二甲基溴化铵(C12N+),应用于超声辐照苯乙烯乳液聚合中,采用红外光谱、表面张力测试、核磁共振氢谱、透射电镜对聚合产物的结构和形貌进行了表征。结果表明,可聚合表面活性剂...合成了一种阳离子可聚合表面活性剂甲基丙烯酰氧乙基十二烷基二甲基溴化铵(C12N+),应用于超声辐照苯乙烯乳液聚合中,采用红外光谱、表面张力测试、核磁共振氢谱、透射电镜对聚合产物的结构和形貌进行了表征。结果表明,可聚合表面活性剂与苯乙烯发生了共聚反应,且反应完全,制备了高纯聚合物纳米胶乳。实验证明,C12N+同时起到了乳化剂、引发剂和共聚单体三重作用,与用一般乳化剂十二烷基硫酸钠(SDS)相比,表现出引发效率高(诱导期<15 m in)、反应速率快(最大反应速率为SDS体系的3倍)、低声强下单体转化率高(反应60 m in单体转化达到90%以上)、无乳化剂残留的优点。展开更多
Poly (L-lactide) was prepared by bulk polymerization ofL-lactide at 140°C in the presence of stannous octoate. The polymer products were characterized by number average molecular weight Mn, weight average molecul...Poly (L-lactide) was prepared by bulk polymerization ofL-lactide at 140°C in the presence of stannous octoate. The polymer products were characterized by number average molecular weight Mn, weight average molecular weight Mw and molecular weight distribution MWD (M w/M n) respectively. The results showed that stannous octoate was a high effective catalyst, and coordinated insertion mechanism of the reaction was proposed.展开更多
文摘合成了一种阳离子可聚合表面活性剂甲基丙烯酰氧乙基十二烷基二甲基溴化铵(C12N+),应用于超声辐照苯乙烯乳液聚合中,采用红外光谱、表面张力测试、核磁共振氢谱、透射电镜对聚合产物的结构和形貌进行了表征。结果表明,可聚合表面活性剂与苯乙烯发生了共聚反应,且反应完全,制备了高纯聚合物纳米胶乳。实验证明,C12N+同时起到了乳化剂、引发剂和共聚单体三重作用,与用一般乳化剂十二烷基硫酸钠(SDS)相比,表现出引发效率高(诱导期<15 m in)、反应速率快(最大反应速率为SDS体系的3倍)、低声强下单体转化率高(反应60 m in单体转化达到90%以上)、无乳化剂残留的优点。
文摘Poly (L-lactide) was prepared by bulk polymerization ofL-lactide at 140°C in the presence of stannous octoate. The polymer products were characterized by number average molecular weight Mn, weight average molecular weight Mw and molecular weight distribution MWD (M w/M n) respectively. The results showed that stannous octoate was a high effective catalyst, and coordinated insertion mechanism of the reaction was proposed.
