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Citation: LI Guo-Xi, XIA Xiao-Hong, YAO Can Long, KUANG Ya-Fei, LIU Guo-Gen. ESR Study on the Adsorption Behavior of Sodium Polyacrylate at the MgCO₃-Water Interface[J]. Chinese Journal of Applied Chemistry, ;2002, 19(5): 433-436. shu

ESR Study on the Adsorption Behavior of Sodium Polyacrylate at the MgCO₃-Water Interface

1.
a College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082;
2.
b Education Ministry Key Laboratory of Nonferrous Metal Materials Science and Engineering, Central South University, Changsha

Corresponding author: LI Guo-Xi,
Received Date: 11 July 2001
Available Online: 4 December 2001
Fund Project: 国家自然科学基金(29773012) (29773012)

The adsorption configuration and molecular motion behavior of sodium polyacrylate(Na-PA) on the surface of MgCO₃ have been investigated by using the electron spin resonance(ESR) combined with spin labeling technique. The adsorption isotherm of sodium polyacrylate on the MgCO₃ 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 MgCO₃ surface and polyanions of PA causing the adsorption.
- sodium polyacrylate,
- magnesium carbonate,
- adsorption,
- ESR,
- spin-labeling
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ESR Study on the Adsorption Behavior of Sodium Polyacrylate at the MgCO3-Water Interface

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ESR Study on the Adsorption Behavior of Sodium Polyacrylate at the MgCO₃-Water Interface