Górecki Radosław, Bhaumik Saibal, Qasem Eyad, Loiola Livia, Emwas Abdul-Hamid, Ntetsikas Konstantinos, Hadjichristidis Nikos, Nunes Suzana P
Environmental Science and Engineering Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Polymer Synthesis Laboratory, Chemistry Program, Physical Science and Engineering Division, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Small. 2025 Jan;21(3):e2409139. doi: 10.1002/smll.202409139. Epub 2024 Nov 26.
A well-defined α,ω-dialdehyde polyisoprene-b-polystyrene block copolymer, synthesized using anionic polymerization high-vacuum techniques, is employed to prepare vitrimers with tris(2-aminoethyl)amine as the cross-linking agent. The vitrimer network, featuring dynamic imine cross-links, results in robust, flexible, and solvent-resistant films, which are applicable in thin film composite membranes. These vitrimer membranes, with molecular weight cut-offs in the nanofiltration range, are successfully used for organic solvent separation and evaluated for gas separation. The cross-linking density, controlled by the cross-linker, affects the material's gas permeability and affinity for CO₂. The dynamic nature of the imine cross-links enables the vitrimer's self-healing ability, activated by heat treatment at temperatures as low as 50 °C. Additionally, the vitrimer membranes can be reprocessed through solvent dissolution in the presence of the excess cross-linking agent.
使用阴离子聚合高真空技术合成的一种结构明确的α,ω-二醛基聚异戊二烯-b-聚苯乙烯嵌段共聚物，被用于制备以三（2-氨基乙基）胺作为交联剂的可塑交联聚合物。具有动态亚胺交联的可塑交联聚合物网络形成了坚固、柔韧且耐溶剂的薄膜，适用于薄膜复合膜。这些截留分子量在纳滤范围内的可塑交联聚合物膜成功用于有机溶剂分离，并进行了气体分离评估。由交联剂控制的交联密度会影响材料的气体渗透性和对CO₂的亲和力。亚胺交联的动态特性使可塑交联聚合物具有自修复能力，在低至50°C的温度下进行热处理即可激活。此外，可塑交联聚合物膜在存在过量交联剂的情况下可通过溶剂溶解进行再加工。
