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Citation: JIN Shuping, YUE Guoren, ZHANG Feng, FENG Lei, YU Xinghai. Salt Resistance Improvement of Polyacrylic Acid Gel by Activated Carbon Complex and Its Swelling Mechanism[J]. Chinese Journal of Applied Chemistry, ;2012, 29(2): 166-173. doi: 10.3724/SP.J.1095.2012.00087 shu

Salt Resistance Improvement of Polyacrylic Acid Gel by Activated Carbon Complex and Its Swelling Mechanism

1.
Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, Department of Chemistry, Hexi University, Zhangye 734000, China

Corresponding author: JIN Shuping,
Received Date: 4 March 2011
Available Online: 28 June 2011
Fund Project: 甘肃省高校河西走廊特色资源利用省级重点实验室资助项目(XZ0801) (XZ0801)

Polyacrylic acid/activated carbon composite hydrogel(PAA/AC) was prepared by free radical solution polymerization of acrylic acid(AA) using ammonium persulfate as an initiator and N,N'-methylene-bis-acrylamide as a crosslinker in the presence of activated carbon.The equilibrium swelling degree and the dynamics of the gels swelling in distilled water,saline and buffer solutions with different pH were studied.The results showed that the activated carbon enhanced the swelling capacity of PAA gel effectively,the PAA/AC hydrogel exhibits higher equilibrium degree of swelling(SW_eq) than PAA hydrogel over the range of pH investigated,and the SW_eq of PAA/AC is about 303 and 60(g/g) in distilled water and saline,respectively,which is about 2.4 times higher than that of PAA hydrogel.The mechanism of the swelling was also discussed,and the results showed that the aggregated structure of the polymer chains might be destroyed by the intervention of the activated carbon,which caused a decrease in interactions among polymer chains and an increase in the swelling capacity of PAA/AC gel.The glass transition temperatures(T_g) and cross sectional morphologies of PAA and PAA/AC gels were measured by differential scanning calorimetry(DSC) and scanning electron microscope(SEM),respectively,and the results further proved a decrease in the interactions among polymer chains.
- activated carbon,
- composite hydrogel,
- equilibrium swelling degree,
- swelling mechanism,
- Fick's law
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