Weigelt Fynn, Georgopanos Prokopios, Shishatskiy Sergey, Filiz Volkan, Brinkmann Torsten, Abetz Volker
Helmholtz-Zentrum Geesthacht, Institute of Polymer Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany.
Institute of Physical Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
Polymers (Basel). 2018 Jan 8;10(1):51. doi: 10.3390/polym10010051.
In this work, mixed-matrix membranes (MMMs) for gas separation in the form of thick films were prepared via the combination of the polymer Matrimid 5218 and activated carbons (AC). The AC particles had a mean particle size of 1.5 μm and a mean pore diameter of 1.9 nm. The films were prepared by slow solvent evaporation from casting solutions in chloroform, which had a varying polymer⁻AC ratio. It was possible to produce stable films with up to a content of 50 vol % of AC. Thorough characterization experiments were accomplished via differential scanning calorimetry and thermogravimetric analysis, while the morphology of the MMMs was also investigated via scanning electron microscopy. The gas transport properties were revealed by employing time-lag measurements for different pure gases as well as sorption balance experiments for the filler particles. It was found that defect free Matrimid MMMs with AC were prepared and the increase of the filler content led to a higher effective permeability for different gases. The single gas selectivity of different gas pairs maintained stable values with the increase of AC content, regardless of the steep increase in the effective permeability of the pure gases. Estimation of the solubilities and the diffusivities of the Matrimid, AC, and MMMs allowed for the explanation of the increasing permeabilities of the MMMs, with the increase of AC content by modelling.
在这项工作中，通过将聚合物Matrimid 5218与活性炭（AC）相结合，制备了厚膜形式的用于气体分离的混合基质膜（MMM）。AC颗粒的平均粒径为1.5μm，平均孔径为1.9nm。这些膜是通过从氯仿浇铸溶液中缓慢蒸发溶剂制备的，其中聚合物与AC的比例各不相同。有可能制备出AC含量高达50体积%的稳定膜。通过差示扫描量热法和热重分析完成了全面的表征实验，同时还通过扫描电子显微镜研究了MMM的形态。通过对不同纯气体进行时间滞后测量以及对填料颗粒进行吸附平衡实验，揭示了气体传输特性。结果发现，制备出了无缺陷的含AC的Matrimid MMM，填料含量的增加导致不同气体的有效渗透率更高。不同气体对的单气体选择性随着AC含量的增加保持稳定值，而不管纯气体的有效渗透率急剧增加。通过建模估计Matrimid、AC和MMM的溶解度和扩散率，可以解释MMM随着AC含量增加渗透率升高的现象。
