淀粉-丙烯酰胺接枝共聚物测定方法研究  

Method for Determination Graft Copolymers of Starch with Acrylamide

作　　者：张友全[1] 颜博渊[1] 徐文领[1] 尹丽[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《化学世界》2006年第9期524-529,共6页Chemical World

基　　金：广西自然科学基金资助(桂科基0342005-2)

摘　　要：为快速、方便、准确地测定淀粉与丙烯酰胺接枝共聚反应技术控制指标和产品组成,提出了以凯氏定氮法为基础、通过测定接枝产物除去均聚物前后的氮含量、计算接枝共聚反应聚合率、接枝率和接枝效率以及接枝产品组成的分析方法,并以溴化法测定计算的聚合率为基准,通过物料质量恒算,验证了该分析方法的合理性和可靠性。确定了以冰乙酸/乙二醇(体积比60∶40)为抽提溶剂,每小时回流6次,抽提6 h,完全除去均聚物的操作条件。研究了工业分析简化方法,忽略(阳离子)淀粉接枝骨架氮含量及其在抽提过程的损失,接枝产品中均聚物、接枝聚合物和接枝骨架的含量基本上可反映三者的真实含量,绝对误差小于1个百分点。In order to determine rapidly, expediently and exactly methodology technical parameters and product component relating to graft copolymefizarion of starch with acrylamide, the method was advanced that the graft copolymer＇ s nitrogen content fore and after eliminating homopolymer was determined by Kjeldahl determination, the rate of polymerization, percentage and efficiency of grafting, and product component were calculated from these results. The method＇s rationality and reliability were validated through mass conservation calculating with the rate of polymerization followed by bromometric titration as benchmark. Graft copolymer was extracted 6 hours by soxhlet extraction with a 60：40 （by vol. ） mixture of acetic acid and glycol at back flow 6 times per hour, homopolymer could be removed entirely. Ignoring graft framework＇ s （starch or cationic starch） nitrogen content and its loss in the process of extracting, the content of homopolymer, graft-polymer, and graft framework approached their true value in product, absoluteness error is less than lpercent point, so it could become compendious determination in industry.

关 键 词：淀粉 丙烯酰胺 接枝共聚 凯氏定氮法 

分 类 号：O652.1[理学—分析化学]