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 ,聚丙烯酸负离子通过与碳酸镁表面的正电荷作用发生吸附 Adsorption configuration and molecular motion of sodium polyacrylate on the surface of magnesium carbonate were studied by electron spin resonance technique and spin labeling technique.The results showed that the adsorption isotherm of sodium polyacrylate on magnesium carbonate was Langmuir type, Degree, the sodium polyacrylate molecules immobilized on the surface of magnesium carbonate adsorption chain fraction (p) larger, mainly in the horizontal adsorption, and in the high surface coverage, p value smaller, chain and chain tail number increases. In the initial stage of adsorption, the polyacrylate anion is adsorbed by the positive charge on the surface of magnesium carbonate