离子强度对P(HEMA-co-MMA)水凝胶溶胀性能及水的状态的影响

Effect of Ionic Strength on the Swelling Behavior and the State of Water of P(HEMA-co-MMA) Hydrogel

对甲基丙烯酸β羟乙酯(HEMA)与甲基丙烯酸甲酯(MMA)共聚水凝胶扩散行为、聚合物溶剂相互作用及水的状态进行了研究。考察了不同NaCl离子强度下水凝胶平衡含水率、扩散系数及聚合物溶剂相互作用参数的变化关系。研究结果表明,随着NaCl离子强度增大,平衡含水率降低,扩散系数下降,聚合物溶剂相互作用参数升高。通过DSC测定了水凝胶中冻结水和非冻结水的组成。

Crosslinked copolymers of 2-hydroxyethylmethacrylate/methylmethacrylate (HEMA/MMA) with different MMA contents were prepared. Water sorption kinetics, copolymer-solvent interaction parameters (χ) and water structure have been studied with the introduction of chloride sodium (NaCl). The results indicate that when increasing the ionic strength of NaCl, the equilibrium water content and diffusion coefficient both decrease but copolymer-solvent interaction parameters increase. The amount of freezing water and nonfreezing water were determined by differential scanning calorimetry(DSC).