【摘要】 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。更多还原

【Abstract】 Hydrogel materials was synthesized by radical copolymerization of NVP and HEMA,with azobisisobutyronitrile(AIBN) as an initiator.The convenient apparatus was devised for testing the ion diffusion coefficient of hydrogel membranes.It is found that the transmissibility and permeability of ions in hydrogel can be described according to the solution-diffusion model.The systematic variations in chemical structure and volume fraction of water in polymer bring about significant changes in permeability coefficients.The ionic diffusion coefficient(P) increases as the proportion of NVP increase,hence the increase of freezing water,which is the main carrier transferring oxygen and ion in hydrogel.The relationship between ionic diffusion coefficient and hydrate degree(H) can be described in free volume theory.更多还原