Graft modification of polybenzimidazole membranes for organic solvent ultrafiltration with scale up to spiral wound modules
Graft modification of polybenzimidazole membranes for organic solvent ultrafiltration with scale up to spiral wound modules
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DOI：
10.1016/j.memsci.2021.120199
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发表时间：
2021-12
影响因子：
9.5
通讯作者：
Adam Oxley;P. Gaffney;Daeok Kim;P. Marchetti;A. Livingston
中科院分区：
文献类型：
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作者：
Adam Oxley;P. Gaffney;Daeok Kim;P. Marchetti;A. Livingston
在这项工作中，通过改变两种接枝剂的摩尔比来调整交联有机溶剂稳定PBI膜的选择性：长柔性聚合物改性剂（Elastamine RE-1-1000，1000 g mol-1）和小分子改性剂（2-甲氧基乙胺，75 g mol-1）。专门与长链改性剂接枝提供了一个膜的截留分子量（MWCO）为2000克mol-1的乙腈。在接枝反应中增加小分子改性剂的比例覆盖膜中的接枝位点。这导致聚合物改性剂的接枝密度降低，并允许MWCO在乙腈中在2000 g mol-1和20，000 g mol-1之间定制。高接枝密度是这种性能控制的基础，在改性过程中膜的比重增加高达43%。该技术被放大到制造5 m长度的膜，该膜被并入1.8“x 12”螺旋缠绕模块中，其显示出与平片膜一致的性能。
In this work the selectivity of crosslinked organic solvent stable PBI membranes is tuned by varying the molar ratio of two grafting agents: a long flexible polymer modifier (Elastamine RE-1-1000, 1000 g mol-1) and a small molecule modifier (2-methoxyethylamine, 75 g mol-1). Grafting exclusively with the long chain modifier provided a membrane with a molecular weight cut-off (MWCO) of 2000 g mol-1in acetonitrile. Increasing the proportion of small molecule modifier in the grafting reaction capped the grafting sites in the membrane. This caused a decrease in the grafting density of the polymer modifier and allowed for the MWCO to be customised between 2000 g mol-1and 20,000 g mol-1in acetonitrile. High grafting densities underlie this control of performance, with up to 43% increase in the specific weight of the membrane during modification. This technique was scaled up to the manufacture of 5 m lengths of membrane that were incorporated into 1.8″ x 12” spiral wound modules, which showed performance consistent with the flat sheet membranes.