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| Study on the Swelling Kinetics of pH-sensitive Cellulose-based Hydrogels |
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| DOI： |
| Key Words:pH-sensitive; swelling kinetic; hydrogels; cellulose |
| Fund Project:国家973项目(No.2010CB732206)；国家自然科学基金项目(No.30972324)。 |
| Author Name | Affiliation | | 周益名 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 付时雨* | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 杨韶平 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 詹怀宇 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 |
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| Abstract: |
| Cellulose-graft-acrylic acid (C-g-AA) hydrogels were prepared via graft polymerization in 85% phosphoric acid solution, the pH sensitivity and reversibility, salt sensitivity and swelling kinetics of the hydrogels were tested. The results showed that the hydrogels had obvious pH sensitivity, the swelling reached equilibrium when pH＞7, and the hydrogels also displayed excellent pH reversibility. The swelling ratio in distilled water was increased with increasing of AA components in hydrogels, and could reached 73% with mole ratio of 6∶1 (AA/cellulose). The swelling kinetics in the solutions with various pH values indicated that the initial water intake of hydrogels followed a non-Fickian type diffusion with the diffusion exponents all higher than 0.5, and the whole swelling process fit the Schott model well. In distilled water, the initial water intake also followed a non-Fickian type diffusion, while the whole swelling did not obey the Schott swelling kinetic model. |
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