Organic solvent reverse osmosis using CuAAC-crosslinked molecularly-mixed composite membranes
Organic solvent reverse osmosis using CuAAC-crosslinked molecularly-mixed composite membranes
复制标题
DOI：
10.1016/j.memsci.2021.119700
复制
发表时间：
2021-08-13
影响因子：
9.5
通讯作者：
Lively, Ryan P.
中科院分区：
文献类型：
--
作者：
Rivera, Matthew P.;Bruno, Nicholas C.;Lively, Ryan P.
分子混合复合膜(MMCM)含有无定形混杂多孔有机笼(ASPOCs)，是一类迅速出现的膜，其特点是由于高度的均质性而形成固溶体，这在其他类型的聚合物-颗粒复合材料中是不存在的。分子级混合克服了两相复合材料通常遇到的许多性能/加工问题。然而，聚合物基质的化学稳定可以使ASPOC笼失活。在这里，我们展示了一种在MMCMS中使用铜催化的叠氮炔环加成(CuAAC)点击反应来交联基质(R)的替代方法。我们制备了薄膜复合膜，并在横流渗透系统中对它们进行了测试，其中标准的苯乙烯低聚物溶解在各种有机溶剂中，以及典型的有机溶剂反渗透分离。我们发现，ASPOC的存在使渗透系数和苯乙烯二聚体分离因子分别增加了79%和154%，这取决于溶剂的不同，尽管ASPOC负载量越高，分离因子就越低。用有机溶剂反渗透方式进行溶剂-溶剂分离，可以有效地从三异丙苯中提纯甲苯。这项工作提供了理解MMCM中发生的质量传输过程所需的实验观察，并突出了它们的分离性能和放大潜力。
Molecularly-mixed composite membranes (MMCMs) incorporating amorphous scrambled porous organic cages (ASPOCs) are a rapidly emerging membrane class that are characterized by the formation of a solid solution due to a high degree of homogeneity that is not observed in other classes of polymer-particle composites. Molecularlevel mixing overcomes many of the performance/processing issues typically encountered with two phase composite materials. However, chemical stabilization of the polymer matrix can deactivate the ASPOC cages. Here, we illustrate an alternative method of crosslinking Matrimid (R) in MMCMs using the copper catalyzed azide alkyne cycloaddition (CuAAC) click reaction. We fabricated thin film composite membranes and benchmarked them in a crossflow permeation system with standard styrene oligomers dissolved in a variety of organic solvents as well as an exemplar organic solvent reverse osmosis separation. We found that the presence of ASPOC increased both permeance and styrene dimer separation factor by up to 79% and 154%, respectively, over crosslinked Matrimid depending on the solvent, although the separation factor decreased at higher ASPOC loadings. The crosslinked MMCMs were challenged with a solvent-solvent separation in an organic solvent reverse osmosis modality and were able to effectively purify toluene from triisopropylbenzene. This work provides experimental observations needed to understand the mass transport processes occurring in MMCMs and highlights their separation performance and scale-up potential.