Karunakaran Madhavan, Kumar Mahendra, Shevate Rahul, Akhtar Faheem Hassan, Peinemann Klaus-Viktor
Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Polymers (Basel). 2017 Jul 6;9(7):219. doi: 10.3390/polym9070219.
In this work, we report the successful fabrication of CO₂-philic polymer composite membranes using a polyacrylonitrile--poly(ethylene glycol) methyl ether methacrylate (PAN--PEGMA) copolymer. The series of PAN--PEGMA copolymers with various amounts of PEG content was synthesized by free radical polymerization in presence of AIBN initiator and the obtained copolymers were used for the fabrication of composite membranes. The synthesized copolymers show high molecular weights in the range of 44⁻56 kDa. We were able to fabricate thin film composite (TFC) membranes by dip coating procedure using PAN--PEGMA copolymers and the porous PAN support membrane. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were applied to analyze the surface morphology of the composite membranes. The microscopy analysis reveals the formation of the defect free skin selective layer of PAN--PEGMA copolymer over the porous PAN support membrane. Selective layer thickness of the composite membranes was in the range of 1.32⁻1.42 μm. The resulting composite membrane has CO₂ a permeance of 1.37 × 10 m³/m²·h·bar and an ideal CO₂/N₂, selectivity of 65. The TFC membranes showed increasing ideal gas pair selectivities in the order CO₂/N₂ > CO₂/CH₄ > CO₂/H₂. In addition, the fabricated composite membranes were tested for long-term single gas permeation measurement and these membranes have remarkable stability, proving that they are good candidates for CO₂ separation.
在这项工作中，我们报告了使用聚丙烯腈-聚（甲基丙烯酸乙二醇甲醚）（PAN-PEGMA）共聚物成功制备亲二氧化碳聚合物复合膜的过程。通过在偶氮二异丁腈（AIBN）引发剂存在下的自由基聚合反应，合成了一系列具有不同PEG含量的PAN-PEGMA共聚物，并将所得共聚物用于制备复合膜。合成的共聚物显示出44⁻56 kDa范围内的高分子量。我们能够通过浸涂工艺，使用PAN-PEGMA共聚物和多孔PAN支撑膜制备薄膜复合（TFC）膜。应用扫描电子显微镜（SEM）和原子力显微镜（AFM）分析复合膜的表面形态。显微镜分析揭示了在多孔PAN支撑膜上形成了无缺陷的PAN-PEGMA共聚物致密选择层。复合膜的选择层厚度在1.32⁻1.42μm范围内。所得复合膜的CO₂渗透通量为1.37×10 m³/m²·h·bar，理想的CO₂/N₂选择性为65。TFC膜显示出理想气体对选择性按CO₂/N₂>CO₂/CH₄>CO₂/H₂的顺序增加。此外，对制备的复合膜进行了长期单气体渗透测量测试，这些膜具有显著的稳定性，证明它们是用于CO₂分离的良好候选材料。
