Interaction between an acidic extractant and an octadecylamino group introduced into a grafted polymer chain
Interaction between an acidic extractant and an octadecylamino group introduced into a grafted polymer chain
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DOI：
10.1080/01496390500423714
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发表时间：
2005-01-01
影响因子：
2.8
通讯作者：
Saito, K
中科院分区：
文献类型：
--
作者：
Asai, S;Watanabe, K;Saito, K
将聚甲基丙烯酸缩水甘油酯(GMA)附加到环氧基团密度为14mol/kg起始多孔膜的中空纤维形式的多孔膜上。将十八烷基胺添加至聚合物刷的环氧基团中，环氧基团至十八烷基氨基的最大摩尔转化率为59％。通过将添加十八胺的多孔膜浸入Cyanex 272/乙醇溶液中，将酸性萃取剂双(2,4,4,-三甲基戊基)次膦酸(Cyanex 272)浸渍在十八胺基上。浸渍的萃取剂的量为1.4mol/kg GMA接枝多孔膜，摩尔转化率为59％。 Cyanex 272 的次膦酸部分被聚合物刷的十八烷基氨基的氨基部分吸引，从而膨胀多孔膜的整个体积。这种溶胀补偿了由于将带电聚合物刷接枝到多孔膜的孔表面而引起的孔体积减少。根据周围液体的特性，将浸渍的 Cyanex 272 重新定位在带电聚合物刷上。疏水相互作用使 Cyanex 272 的疏水部分能够与聚合物刷的十八烷基氨基的十八烷基部分缔合以捕获锌离子。浸渍Cyanex 272的聚合物刷对锌离子的结合效率高达93%。
Poly-glycidyl methacrylate (GMA) was appended onto a porous membrane of a hollow-fiber form with an epoxy group density of 14 mol per kg of the starting porous membrane. Octadecylamine was added to the epoxy group of the polymer brush at a maximum molar conversion of the epoxy group into the octadecylamino group of 59%. An acidic extractant, bis(2,4,4,-trimethylpentyl)phosphinic acid (Cyanex 272), was impregnated on the octadecylamino group by immersion of the octadecylamine-added porous membrane in Cyanex 272/ethanol solution. The amount of impregnated extractant was 1.4 mol per kg of the GMA-grafted porous membrane at a molar conversion of 59%. The phosphinic acid moiety of Cyanex 272 was attracted by the amino part of the octadecylamino group of the polymer brush to swell the entire volume of the porous membrane. This swelling compensated for the pore volume reduction caused by grafting the charged polymer brush to the pore surfaces of the porous membrane. The impregnated Cyanex 272 was repositioned on the charged polymer brush in response to the properties of surrounding liquids. The hydrophobic interaction enables the hydrophobic moiety of Cyanex 272 to associate with the octadecyl part of the octadecylamino group of the polymer brush to capture zinc ions. The binding efficiency of the Cyanex 272-impregnated polymer brush for zinc ion was as high as 93%.