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首页> 外文期刊>Journal of Applied Polymer Science >A comparative study of swelling properties of hydrogels based on poly(acrylamide-co-methyl methacrylate) containing physical and chemical crosslinks
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A comparative study of swelling properties of hydrogels based on poly(acrylamide-co-methyl methacrylate) containing physical and chemical crosslinks

机译：基于含有物理和化学交联键的聚丙烯酰胺-甲基丙烯酸甲酯共​​聚物的水凝胶溶胀性能的比较研究

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Poly (acrylamide-co-methyl methacrylate) hydrogels of different ratios were prepared by using chemical and physical crosslinks to study the effect of nature of crosslinks on swelling behavior of hydrogels. The chemically crosslinked gels were prepared by using NN'-methylene bis acrylamide, while physically crosslinked hydrogels were prepared by precipitation polymerization method, using dioxane as solvent. Detailed swelling kinetics such as swelling ratio, transport exponent n, diffusion coefficient D and the effect of pH on equilibrium swelling studies. The study revealed that the nature of crosslinks alter the swelling characteristics of the hydrogel. In chemically crosslinked hydrogels the water transport is Fickian in nature, while in the case of the physically crosslinked hydrogels the water transport mechanism is anomalous indicating major change in relaxation mechanism due to nature of crosslinks. The results also indicate that with increasing acrylamide content the swelling ratio of the hydrogels were also increased, but the transport exponent n remains nearly constant. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：通过化学和物理交联研究了交联性质对水凝胶溶胀行为的影响，制备了不同比例的聚丙烯酰胺-甲基丙烯酸甲酯共​​聚物水凝胶。化学交联的凝胶是使用NN'-亚甲基双丙烯酰胺制备的，而物理交联的水凝胶是通过沉淀聚合法（以二恶烷为溶剂）制备的。详细的溶胀动力学，例如溶胀比，转运指数n，扩散系数D和pH对平衡溶胀研究的影响。研究表明，交联的性质改变了水凝胶的溶胀特性。在化学交联的水凝胶中，水的输送本质上是费克式的，而在物理交联的水凝胶中，水的输送机理是异常的，这表明由于交联的性质，弛豫机理发生了重大变化。结果还表明，随着丙烯酰胺含量的增加，水凝胶的溶胀率也增加，但转运指数n几乎保持恒定。 （C）2003 Wiley Periodicals，Inc. [参考：23]

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