Isolation and analysis of a grafted polymer onto a straight cylindrical pore in a thermal-responsive gating membrane and elucidation of its permeation behavior
Isolation and analysis of a grafted polymer onto a straight cylindrical pore in a thermal-responsive gating membrane and elucidation of its permeation behavior
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DOI：
10.1016/j.memsci.2010.01.052
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发表时间：
2010-04-15
影响因子：
9.5
通讯作者：
Yamaguchi, Takeo
中科院分区：
文献类型：
--
作者：
Kuroki, Hidenori;Ohashi, Hidenori;Yamaguchi, Takeo
通过等离子体引发接枝聚合，在孔表面接枝了N-异丙基丙烯酰胺(NIPAM)聚合物，获得了透过率变化达几百倍的温敏门控膜。在本研究中，我们使用具有直圆柱孔的聚碳酸酯(PC)基片来制作门控薄膜。这种底物可以在强碱性溶液中降解，因此从底物中分离出接枝的NIPAM聚合物并进行了评价。相应地，我们发现接枝的聚合物具有较高的相对分子质量(从几十万到几百万)，并且聚合物的链密度在约0.01链nm(-2)处很低。这些结果表明，这些因素对剧烈的气孔浇注非常重要；在低链密度下，由于存在足够的空间来收缩接枝聚合物，气孔以收缩状态完全打开。此外，溶胀的NIPAM聚合物和少量的高分子量聚合物充分地闭合了孔。在此基础上，首次阐明了接枝聚合物的性能与热敏浇注膜渗透行为之间的关系。此外，本研究所获得的知识可为阐明其他嫁接技术所获得的门控功能提供有益的指导。(C)2010爱思唯尔B.V.保留所有权利。
We have attained the thermal-responsive gating membrane with a drastic permeability change by several hundredfold; N-isopropylacrylamide (NIPAM) polymers were grafted on the pore surface by the plasma-induced graft polymerization. In this study, we fabricated the gating membrane using a polycarbonate (PC) substrate with straight cylindrical pores. This substrate can be degraded in a strong-alkaline solution, thus the grafted NIPAM polymer was isolated from the substrate and evaluated. Accordingly, we found the grafted polymer has a high molecular weight (from several hundred thousand to a few million) and the polymer chain density is low at ca. 0.01 chains nm(-2). These results indicate factors significant to drastic pore gating; the pores are fully open in a shrunken state at the low chain density, by the existence of enough space for shrinking grafted polymers. Further, the pores are sufficiently closed by swollen NIPAM polymers with a small number of high molecular weight polymers. From the above, we clarified the relationship between the property of the grafted polymer and the permeation behavior of the thermal-responsive gating membrane for the first time. Moreover, the knowledge obtained in this study can provide useful guideline for clarifying the gating function obtained by other grafting technique. (C) 2010 Elsevier B.V. All rights reserved.