Preparation of γ-PGA hydrogels and swelling behaviors in salt solutions with different ionic valence numbers
| Autor: | Maoqi Wu, Wen Guo, Qiao Changsheng, He Guidong, Hua Jiachuan, Zheng Li, Jianfei Zhang, Jixian Gong |
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| Rok vydání: | 2017 |
| Předmět: |
Valence (chemistry)
Chemistry General Chemical Engineering Swelling capacity Kinetics technology industry and agriculture Ionic bonding Solution polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chemical engineering Self-healing hydrogels Polymer chemistry medicine Fourier transform infrared spectroscopy Swelling medicine.symptom 0210 nano-technology |
| Zdroj: | RSC Advances. 7:11085-11093 |
| ISSN: | 2046-2069 |
| Popis: | In this paper, a novel poly γ-glutamic acid (γ-PGA) hydrogel was successfully synthesized by solution polymerization and ethylene glycol diglycidyl ether (EGDE) was used as crosslinker. The structure and morphology of the γ-PGA was investigated using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) techniques. The influence of ionic (Na+, Ca2+ and Fe3+) concentrations, temperature and pH on the swelling degree of γ-PGA hydrogels was studied. The results revealed that the swelling capacity is enhanced with increasing pH, but decreased with increasing ionic concentration. The swelling kinetics study indicated that γ-PGA hydrogels were ion-sensitive and presented more limited swelling kinetics in metal ion solutions with higher ionic valence numbers. The results showed that the pseudo-second-order adsorption kinetics were predominant. Maximum swelling degrees were obtained for γ-PGA hydrogels with 21.03 g g−1 in 0.154 mol L−1 NaCl solution, 8.5 g g−1 in 0.154 mol L−1 CaCl2 solution and 12.8 g g−1 in 0.154 mol L−1 FeCl3 solution. Considering the simple preparation process, the ionic- and pH-sensitive properties, this γ-PGA hydrogel might have high potential to be used in medical and other fields. |
| Databáze: | OpenAIRE |
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