Wang Zongyu, Chen Hao, Wang Yangyang, Chen Jihua, Arnould Mark A, Hu Bin, Popovs Ilja, Mahurin Shannon M, Dai Sheng
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States.
ACS Appl Mater Interfaces. 2021 Jun 16;13(23):27411-27418. doi: 10.1021/acsami.1c04342. Epub 2021 Jun 6.
Three different types of polymer ligands, poly(methyl methacrylate) (PMMA), poly(methyl methacrylate--poly(ethylene glycol)methyl ether methacrylate) (PMMA--PEGMEMA), and poly(ionic liquid)s (PIL), were grafted onto the surface of 15 nm solid and large hollow porous silica nanoparticles (average particle size ∼60 nm) by surface-initiated atom transfer radical polymerization (SI-ATRP) to demonstrate the enhanced carbon dioxide (CO) permeability as well as mechanical properties. After characterizing the purified products, free-standing bulk films were fabricated by the solvent-casting method. The poly(ionic liquid) nanocomposite films exhibited a much higher carbon dioxide permeance than PMMA and PMMA--PEGMEMA systems with a similar silica content. Also, the hollow silica-mixed matrix membranes showed a significant enhancement in CO permeability compared to the 15 nm solid silica films because of the pore structur. Despite the transparency loss due to the scattering of larger particle sizes, the hollow silica particle brush films exhibited the same mechanical properties as the 15 nm solid silica-derived ones.
通过表面引发原子转移自由基聚合（SI-ATRP），将三种不同类型的聚合物配体，即聚甲基丙烯酸甲酯（PMMA）、聚（甲基丙烯酸甲酯-聚乙二醇甲基醚甲基丙烯酸酯）（PMMA-PEGMEMA）和聚离子液体（PIL）接枝到15纳米的实心和大型中空多孔二氧化硅纳米颗粒（平均粒径约60纳米）表面，以证明二氧化碳（CO₂）渗透性以及机械性能的增强。在对纯化产物进行表征后，通过溶剂浇铸法制备了独立的块状薄膜。与具有相似二氧化硅含量的PMMA和PMMA-PEGMEMA体系相比，聚离子液体纳米复合薄膜表现出更高的二氧化碳渗透率。此外，由于孔隙结构，中空二氧化硅混合基质膜与15纳米实心二氧化硅膜相比，CO₂渗透性有显著提高。尽管由于较大粒径的散射导致透明度损失，但中空二氧化硅颗粒刷膜表现出与15纳米实心二氧化硅衍生膜相同的机械性能。
