聚丙烯酸钠在Al_2O_3/水界面吸附行为的ESR研究  

THE ESR INVESTIGATION ON ADSORPTION BEHAVIOUR OF SODIUM POLYACRYLATE AT Al_2O_3/WATER INTERFACE

作　　者：夏笑虹[1] 李国希[2,3] 旷亚非[2] 刘国根[4] 

机构地区：[1]湖南大学材料科学与工程学院 [2]湖南大学化学化工学院 [3]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410083 [4]中南大学有色金属材料科学与工程教育部重点实验室

出　　处：《离子交换与吸附》2003年第2期127-132,共6页Ion Exchange and Adsorption

基　　金：国家自然科学基金 (29773012) ;教育部高等学校重点实验室访问学者基金

摘　　要：采用电子自旋共振技术结合自旋标记方法研究了聚丙烯酸钠在Al2O3/水界面吸附的分子构型和运动行为。结果表明,哌啶氮氧自由基在聚丙烯酸钠分子上是链间标记,它的运动受到聚合物长链的束缚;聚丙烯酸钠在Al2O3上的吸附等温线呈Langmuir型,随表面吸附量的增加,吸附在Al2O3上的聚丙烯酸钠分子的固着链节分数减小,从平衡浓度0.25mg/ml时的[(0.9)(0)]变化到饱和吸附时的表面,分子中的大部分链节平躺在Al2O3表面,少部分链节伸向溶液。The adsorption configuration and molecular motion behavior of sodium polyacrylate (Na-PA) at Al2O3/water interface were investigated by using the electron spin resonance (ESR) combined with spin-labeling technique. The results demonstrated that nitroxide were separately labeled among the polymer backbone and their motion were restrained by the polymer chain; the adsorption isotherm of sodium polyacrylate on Al2O3 surface is found to be in Langmuir type. The fraction of segments in trains of adsorbed sodium polyacrylate on Al2O3 surface decreased with increasing concentration, from 0.90 at 0.25mg/ml to 0.65 at saturated adsorption. The adsorption of sodium polyacrylate on Al2O3 surface, which was induced by electrostatic attraction, was of the multipoint adsorption, where most segments of sodium polyacrylate were bound to the surface and a few residual segments were dangling in the solution.

关 键 词：Al2O3/水 吸附行为 聚丙烯酸钠 ESR 氧化铝 水 固/液界面 电子自旋共振 自旋标记 哌啶氮氧自由基 

分 类 号：O647.3[理学—物理化学]