淀粉在CS_2/H_2O_2体系中与烯烃接枝共聚

GRAFT POLYMERIZATION OF OLEFIN ONTO STARCH USING CS_2/H_2O_2 AS INITIATOR

采用 CS2 /H2 O2 体系在碱性条件下引发玉米淀粉与丙烯酰胺、苯乙烯接枝共聚 ,系统研究了 Na OH、CS2 和单体的浓度、CS2 /H2 O2 的摩尔比及反应温度等与接枝效应关系。结果发现在适宜条件下 ,室温 (2 5～ 3 5℃ )接枝反应0 .5～ 1 .0 h,单体转化率和接枝效率可达 96%以上。在相同条件下 ,淀粉接枝丙烯酰胺优于苯乙烯。判断该引发体系为氧化还原型 ,属自由基机理 ,并有利于亲水性单体的接枝共聚 ,具有高效、反应条件温和等特征。

Graft polymerization of acrylamide(AM) and styrene(St) onto alkaliline maize starch using CS 2/H 2O 2 as initiator were inverstigated under different conditions including concentration of NaOH, initiator and monomer, the molecular ratio of CS 2 to H 2O 2, polymerization temperature and time. The experimental results indicate that both the optium conversion efficiency of monomer and graft efficiency are above 96% after grafting 0.5~1 h under room temperature(25~35 ℃). The grafting of AM onto starch is easy than St under the same graft conditions. This redox initiator is a radical initiating system, is advantageous for the grafting of water soluable monomer, and has the character of high efficiency and moderate reactionary conditions.