Study on the swelling kinetics of superabsorbent using open circuit potential measurement |
| |
| Authors: | Xiaohua Qi Zhenbin Chen |
| |
| Institution: | a Department of Chemistry and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China
b College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China |
| |
| Abstract: | Open circuit potential measurement was used to trace the swelling kinetics of superabsorbent. The calibration curve and its fitting result showed the validity of the method in determining the concentration of chloride ion in aqueous solution. According to the regression analysis and theoretical derivation, the relationship between the open circuit potential change and the swelling ratio was obtained. Comparing with tea bag method, it was verified that open circuit potential measurement could be employed to trace the swelling kinetics of superabsorbent. The hysteresis effect of solute entering into superabsorbent and the overflow of soluble parts of hydrogel were also observed. Besides, we found that the entrance of solute and water were almost synchronal, and the concentration of solution absorbed by superabsorbent was lower than that of swelling medium. Moreover, the swelling model of superabsorbent in salting liquid was slightly modified. |
| |
| Keywords: | Superabsorbent Swelling kinetics Open circuit potential measurement Hysteresis effect Chloride ion-selective electrode |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
