氧化还原引发下的淀粉、丙烯酸反相乳液聚合

以环己烷为连续相,Span20为乳化剂,采用氧化还原引发体系,通过反相乳液聚合技术,合成淀粉、丙烯酸接枝共聚物。并用红外光谱对共聚物进行了表征。研究结果表明:采用氧化还原引发剂可使聚合反应低温快速进行,在过硫酸钾为3.1mmol/L,亚硫酸氢钠为3.1mmol/L,单体丙烯酸浓度为2.6mol/L,反应温度为30℃,反应时间为3h,乳化剂浓度为5%时,单体转化率为92.6%、淀粉接枝率为43.2%、淀粉接枝效率56.4%。

Study on craft copolymerization of starch with acrylic acid by inverse emulsion polymerization with redox initiator

The starch and acrylic acid graft copolymerization were synthesized by inverse emulsion polymerization,in which the continuous phase was cyclohexane, emulsifying agent was Span20 under the condition of redox initiation system.The copolymerization was characterized with IR. The experiment results showed that the copolymerization can be proceeded fastly in low temperature, and the optimum reaction condition are as follows:the concentration of initiator is 3.1 mmol/L,the acrylic acid concentration is 2.6 mol/L,the reaction temperature is 30℃,the reaction time is 3 h,the emulsifying agent is 5%, the monomer conversion rate is 92.6%, grafting ratio is 43.2% and grafting efficiency is (56.4%.)