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以偶氮二异丁腈为引发剂,合成了一系列N-乙烯吡咯烷酮(NVP)/甲基丙烯酸-β-羟乙酯(HEM A)共聚物水凝胶材料。自行设计了测定水凝胶材料透离子性能的装置。研究结果表明,离子在致密高分子膜中的渗透过程符合溶解-扩散机理,随着NVP含量的增加,材料的离子扩散系数P增大,渗透率与高分子的链段活动性和自由体积有关,共聚物水凝胶中钾、钠离子的扩散系数P与聚合物的水化度H之间可以用“自由体积”理论描述。结合水对氧气和离子在水凝胶中的扩散几乎没有贡献,离子在水凝胶的渗透主要是通过水凝胶中的自由水进行传递。
A series of N-vinyl pyrrolidone (NVP) / β-hydroxyethyl methacrylate (HEMA) copolymer hydrogel materials were synthesized using azobisisobutyronitrile as initiator. A self-designed device for measuring the iontophoretic properties of hydrogel materials was designed. The results show that the infiltration process of ions in the dense polymer membrane conforms to the dissolution-diffusion mechanism. With the increase of NVP content, the ion diffusion coefficient P of the material increases, and the permeability is related to the mobility and free volume of the polymer chain , Copolymer hydrogel in potassium, sodium diffusion coefficient P and the degree of hydration H polymer can be used “free volume” theory described. The binding water hardly contributes to the diffusion of oxygen and ions in the hydrogel, the permeation of ions in the hydrogel is mainly through the free water in the hydrogel.