甜菜碱接枝共聚羟丙基瓜胶的制备

Synthesis of Graft Copolymer of betain onto Hydroxypropyl Guar Gum

摘要:

以羟丙基瓜胶和甜菜碱单体为原料，硝酸铈铵为引发剂，使用溶液聚合制备甜菜碱接枝羟丙基瓜胶，对目标物结构进行了IR表征。考察了接枝反应温度、接枝反应时间、引发剂浓度、原料配比对目标物增稠性能的影响，结果表明：当反应温度为20℃，引发剂浓度为5mmol/L，反应时间为24h，m（甜菜碱单体）：m（羟丙基瓜胶）=1：1时，单体转化率为36.5%，分子量为1.28?06；在常温水溶液中（w%=0.5%）可于20min内充分溶解，初始粘度为75mPs；在盐质量分数0%～10%范围内，体系粘度随盐质量分数增加而持续升高，且无沉淀产生。

Abstract:

A graft copolymer of betain onto hydroxypropyl guar gum was prepared by using ceric nitrate as initiator. The product structure was characterized though IR. The effects of graft reaction temperature.，graft reaction time, initiator concentration, m（betain）: m(HPG) on thickening properties of product was investigated. It was indicated that monomer transfer rate was 36.5% and the product molecular could be 1.28?06. The product of 0.5% concentration in aqueous solution could be dissolved completely within 20 minutes and viscosity was 75mPas. The solution viscosity kept increasing with the increasing of salt concentration if salinity was less than 10%. No precipitate appeared during the process.