丙烯酰胺-阳离子瓜尔胶的低温接枝聚合  

Graft Copolymerization of Acrylamide onto Cationic Guar Gum at Low Temperature with High Grafting Efficiency

作　　者：万小芳[1] 李友明[1] 胡庆喜[1] 王义勇[1] 

机构地区：[1]华南理工大学资源科学与造纸工程学院,广东广州510640

出　　处：《高分子材料科学与工程》2008年第7期40-43,共4页Polymer Materials Science & Engineering

摘　　要：用硫酸铈铵引发阳离子瓜尔胶与丙烯酰胺的低温(10℃)水溶液接枝聚合,重点研究单体与引发剂浓度对接枝参数的影响规律,获得了最佳聚合条件。实验表明,阳离子瓜尔胶与丙烯酰胺的聚合速度明显快于未改性瓜尔胶;随着单体浓度的增加,转化率、接枝率逐渐增加,接枝效率高达95%;进一步增加单体浓度(>1.3 mol/L),转化率、接枝率下降速度较快,接枝效率下降缓慢;随着引发剂浓度增加,转化率和接枝率增加到最大值,而引发剂浓度继续增加(>3.3×10-4mol/L),所有接枝参数下降。红外光谱图和热失重数据证实发生了接枝聚合反应。Solution polymerization of aerylamide（AM） onto cationic guar gum（CGG） using eerie ammonium sulphate was realized at 10℃. The effect of monomer and initiator concentration on grafting parameters was studied systematically. It shows that rates of polymerization for CGG-g-PAM are superior to that for unmodified guar gum. With increase in monomer concentration, C and G show an increasing trend up to 1.3 mol/L of AM and then decreased rapidly with GE beyond 95%. The initial enhancement of initiator concentration results in increase of C, G value up to maximum value with larger than 95% of GE. But all the parameters and MW of copolymer fell off with further increase （〉 3.3×10^-4mol/L）. Such optimal conditions are advanced as 1.3 mol/L of monomer concentration, 2.1×10^-4mol/L of initiator concentration, [H^＋] =0.01 mol/L and 12 h of reaction time with 98.3 % grafting efficiency. The synthesized products were then characterized by FT-IR and DTG studies.

关 键 词：丙烯酰胺-阳离子瓜尔胶共聚物 低温聚合 接枝效率 

分 类 号：TQ316.343[化学工程—高聚物工业]