聚丙烯酸钠在碳酸镁-水界面吸附的ESR研究  

ESR Study on the Adsorption Behavior of Sodium Polyacrylate at the MgCO_3-Water Interface

作　　者：李国希[1,2] 夏笑虹[1] 姚灿龙 旷亚非[1] 刘国根[2] 

机构地区：[1]湖南大学化学化工学院,长沙410082 [2]中南大学有色金属材料科学与工程教育部重点实验室长沙

出　　处：《应用化学》2002年第5期433-436,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金 (2 9773 0 12 );教育部高等学校重点实验室访问学者基金资助项目

摘　　要：采用电子自旋共振技术结合自旋标记技术研究了聚丙烯酸钠在碳酸镁表面的吸附构型和分子运动 .结果表明 ,聚丙烯酸钠在碳酸镁上的吸附等温线呈 Langmuir型 ;在低表面覆盖度时 ,聚丙烯酸钠分子固着于碳酸镁表面的吸附链节分数 (p)较大、主要以平躺方式吸附 ,而在高表面覆盖度时 ,p值较小、链环和链尾数增加 .在吸附起始阶段 。The adsorption configuration and molecular motion behavior of sodium polyacrylate( Na PA ) on the surface of MgCO 3 have been investigated by using the electron spin resonance(ESR) combined with spin labeling technique. The adsorption isotherm of sodium polyacrylate on the MgCO 3 surface was of Langmuir type. The fraction of segments in trains( p ) of the adsorbed Na PA in the case of low surface coverage was greater and mainly in flattened shape, whereas in high surface coverage, the p value was relatively small and mainly in more loop shape. At the beginning of adsorption there occurs an attraction between the positive charges of MgCO 3 surface and polyanions of PA causing the adsorption.

关 键 词：聚丙烯酸钠 碳酸镁 吸附 ESR 自旋标记 

分 类 号：O647[理学—物理化学] O631[理学—化学]