Kim Ki Jung, Gwon Yeongseo, An Eun Ji, Lee Jieun, Jo Jin Hui, Park Sungmin, Chi Won Seok
Department of Polymer Engineering, Graduate School, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea.
Advanced Materials Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea.
Chemosphere. 2024 Sep;363:142926. doi: 10.1016/j.chemosphere.2024.142926. Epub 2024 Jul 22.
We report hydroxyl-functionalized microporous polymers with tunable benzaldehyde groups for gas separation membranes. These polymers were synthesized via acid-catalyzed Friedel-Crafts polycondensation. The tunability in d-spacing and fractional free volume of these polymers depends on the para position substituents (-H, -F, -Cl, and -Br) of the benzaldehyde. Specifically, the size and polarity of the para position substituent influence the polymer chain-packing structure. Consequently, the hydroxyl-functionalized microporous polymer membrane with a larger para position substituent in the benzaldehyde group exhibited improved gas permeability. This improvement is due to enhanced gas diffusivity resulting from the inefficient polymer chain-packing structure. Furthermore, these membranes demonstrated enhanced CO plasticization resistance, attributable to the rigid, contorted polymer structure and the hydrogen bonding interactions between hydroxyl groups. This study provides insights into the relationship between the polymer chain-packing structure, tunable para position substituents, and molecular transport.
我们报道了用于气体分离膜的具有可调节苯甲醛基团的羟基官能化微孔聚合物。这些聚合物通过酸催化的傅克缩聚反应合成。这些聚合物的d间距和自由体积分数的可调性取决于苯甲醛的对位取代基（-H、-F、-Cl和-Br）。具体而言，对位取代基的大小和极性会影响聚合物链的堆积结构。因此，苯甲醛基团中具有较大对位取代基的羟基官能化微孔聚合物膜表现出改善的气体渗透性。这种改善归因于聚合物链堆积结构低效导致的气体扩散率增强。此外，这些膜表现出增强的抗CO增塑性能，这归因于刚性、扭曲的聚合物结构以及羟基之间的氢键相互作用。这项研究为聚合物链堆积结构、可调对位取代基和分子传输之间的关系提供了见解。
