Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
Carbohydr Polym. 2014 Sep 22;110:285-91. doi: 10.1016/j.carbpol.2014.03.075. Epub 2014 Apr 3.
Graft copolymer of N-(hydroxymethyl) acrylamide with carboxymethylated guar gum was synthesized and the reaction conditions were optimized for better yield using potassium peroxymonosulfate and thiourea as a redox initiator. The optimum reaction conditions for grafting have also been determined by studying the effect of N-(hydroxymethyl) acrylamide, hydrogen ion, peroxymonosulphate, thiourea concentration and carboxymethylated guar gum along with time and temperature. Experimental results show that maximum grafting has been obtained at 1.4 g dm(-3) concentration of carboxymethylated guar gum and 16×10(-2) mol dm(-3) concentration of N-(hydroxymethyl) acrylamide. It has been observed that grafting ratio, add on, conversion, efficiency and rate of grafting increase up to 6.0×10(-3) mol dm(-3) of hydrogen ion, 2.4×10(-3) mol dm(-3) of thiourea, 14×10(-3) mol dm(-3) of peroxymonosulphate and 35°C of temperature. Grafted copolymer has been characterized by FTIR spectroscopy and thermogravimetric analysis. Water swelling, flocculating, and metal ion uptake properties of partially carboxymethylated guar gum-g-N-(hydroxymethyl) acrylamide have been determined.
N-（羟甲基）丙烯酰胺与羧甲基胍胶接枝共聚物的合成及最佳产率的反应条件优化采用过一硫酸盐和硫脲作为氧化还原引发剂。通过研究 N-（羟甲基）丙烯酰胺、氢离子、过一硫酸盐、硫脲浓度以及羧甲基胍胶的浓度、时间和温度对接枝反应的影响，确定了最佳接枝反应条件。实验结果表明，在 1.4 g dm（-3）浓度的羧甲基胍胶和 16×10（-2）mol dm（-3）浓度的 N-（羟甲基）丙烯酰胺下，接枝率最大。观察到接枝比、加量、转化率、效率和接枝速率在氢离子浓度为 6.0×10（-3）mol dm（-3）、硫脲浓度为 2.4×10（-3）mol dm（-3）、过一硫酸盐浓度为 14×10（-3）mol dm（-3）和 35°C 时增加。通过傅里叶变换红外光谱和热重分析对接枝共聚物进行了表征。测定了部分羧甲基胍胶-g-N-（羟甲基）丙烯酰胺的水膨胀性、絮凝性和金属离子吸附性能。
