壳聚糖-聚丙烯酰胺接枝共聚物接枝率的测定  

A New Method for Measuring the Grafting Ratio of Chitosan-graft-polyacrylamide

作　　者：卢耀柏[1] 袁博[1] 吕东[1] 蔡军[1,2] 奚忠华[2] 卞宁生[2] 章文伟[2] 杨琥[1] 程镕时[1,3] 

机构地区：[1]南京大学化学化工学院教育部介观化学重点实验室高分子科学与工程系,南京210093 [2]南京大学化学化工学院化学实验教学中心,南京210093 [3]华南理工大学材料学院高分子研究所,广州510640

出　　处：《化学学报》2009年第8期879-882,共4页Acta Chimica Sinica

基　　金：国家自然科学基金(No.50633030);国家基础科学人才培养基金"南京大学理科化学基地"(No.J0630425)资助项目

摘　　要：根据溶液的折光指数增量与溶液的组成间存在定量关系的原理提出了一种测定接枝聚合物接枝率的新方法,并用此方法测定了壳聚糖-聚丙烯酰胺接枝共聚物的接枝率.结果通过元素分析法测定样品中氮元素的百分含量,以及运用折光指数增量法测定已知比例的壳聚糖与聚丙烯酰胺(PAM)混合物中二者的质量百分比进行佐证.结果表明,折光指数增量法测定接枝共聚物的接枝率也是可行的.A series of the chitosan-grafi-polyacrylamide samples with various components have been prepared according to a reported method. To measure the grafting ratio of the graft copolymers accurately, a new method of specific refractive index increment measurement has been tried based on the observed solution properties of graft copolymers usually equal to the summation, which are contributed from different components of the copolymers. The calculated results have been compared with those by the elemental analysis method. In addition, the proposed method was further confirmed by measuring the weight percents of the components of chitosan and polyacrylamide （PALM） mixtures, with well known mixed ratios, by specific refractive index increment measurement. However, the further work is being still carried out, and some other graft copolymer systems will be tried in the near future.

关 键 词：壳聚糖-聚丙烯酰胺接枝共聚物 接枝率 折光指数增量法 

分 类 号：O633.2[理学—高分子化学]