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以3-异氰酸丙基三乙氧基硅烷和对甲氧基苯胺为原料合成了一种可以自组装形成有机-无机杂化材料的化合物——3-(脲基-4-甲氧基苯基)丙基三乙氧基硅烷.采用FT-IR,1H NMR,DSC和XRD分析方法对该化合物的结构以及结晶性进行了表征.将该化合物与聚乙烯醇(PVA)共混,利用化合物的自组装性质构筑结构均一且致密无孔的离子通道杂化膜,通过自制的膜运输实验装置测定膜对阳离子的传输性能并提出了相应的传输机制.SEM照片显示,自组装杂化膜致密无缺陷,膜厚度为8μm.选择5种阳离子进行运输实验测试,结果表明,自组装杂化离子通道膜对一价的碱金属离子Li+,Na+和K+有很好的传输功能,这要归功于杂化材料中甲氧基苯基与碱金属阳离子形成的阳离子-π相互作用力.碱金属阳离子在膜中的扩散过程可由溶解-扩散机制来解释,结果显示,Li+,Na+和K+在杂化膜中传输的渗透率大小为:PN a+>PK+>PLi+,说明本研究中的的自组装杂化离子通道膜对Na+有优先选择性.杂化离子通道膜对二价的Ca2+和Mg2+没有传输作用,此结果给一二价阳离子的分离带来很好的研究思路.
3-Isocyanatopropyltriethoxysilane and p-methoxyaniline were used as raw materials to synthesize a compound which can self-assemble into organic-inorganic hybrid material, 3- (ureido-4-methoxy Phenyl) propyltriethoxysilane.The structure and crystallinity of the compound were characterized by FT-IR, 1H NMR, DSC and XRD.The compound was blended with polyvinyl alcohol (PVA) The self-assembly properties of the compounds were investigated. The ion channel hybrid membranes with uniform structure and dense nonporous structure were constructed. The transport properties of the membranes to the cation were measured by a homemade membrane transport experiment apparatus. The SEM images showed that the self-assembled hybrid membranes Dense and defect-free, with a film thickness of 8μm. Five kinds of cations were selected for transportation test. The results show that self-assembled hybrid ion channel membrane has good transport function for monovalent alkali ions Li +, Na + and K + In the hybrid materials, the interaction between methoxyphenyl and alkali metal cations can be explained by the dissolution-diffusion mechanism of alkali metal cation in the membrane. The results show that Li +, Na + and K + The permeability of the membrane transmission size: PN a +> PK +> PLi +, indicating that the self-assembled hybrid ion channel membrane in this study has a preferential selectivity for Na +. The hybrid ion channel membrane has no transmission effect on divalent Ca2 + and Mg2 + The separation leads to a good research idea.