Fine tuning the hydrophobicity of counter‐anions to tailor pore size in porous all‐poly(ionic liquid) membranes

Abstract

Charged porous polymer membranes (CPMs) emerging as a multifunctional platform for diverse applications in chemistry, materials science and biomedicine have been attracting widespread attention. Fabrication of CPMs in a controllable manner is of particular significance for optimizing their function and maximizing practical values. Herein, we report the fabrication of CPMs exclusively from poly(ionic liquid)s (PILs), and their pore size and wettability were precisely tailored by rational choice of counter‐anions. Specifically, a stepwise subtle increase in hydrophobicity of the counter‐anions by extending the length of fluorinated alkyl substituents, i.e. from bis(trifluoromethane sulfonyl)imide to bis(pentafluoroethane sulfonyl)imide and bis(heptafluoropropane sulfonyl)imide, decreased the average pore size gradually from 1546 to 157 and 77 nm, respectively. Meanwhile, the corresponding water contact angles increased from 90° to 102° and 120°. The sensitive control over the porous architectures and surface wettability of CPMs by systematic variation of anion hydrophobicity provides solid proof of the impact of PIL anions on CPM structure. © 2019 Society of Chemical Industry

Bioaccumulation of Novel Per- and Polyfluoroalkyl Substances in Mice Dosed with an Aqueous Film-Forming Foam

“…Manual annotation of the MS/MS spectra supported assignment of these compounds as a homologous series of symmetric and asymmetric sulfonimide dimers. These dimers can be synthesized from FASAs and are used in the synthesis of ionic liquids, , but they have not been previously described in AFFFs or AFFF-impacted environments. The retention times for this dimer series were distinct from FASAs and other series identified via suspect screening, ruling out the possibility that these compounds are artifacts from in-source dimer formation of other identified compounds.…”

Functional Poly(ionic liquid) Porous Membranes: From Fabrications to Advanced Applications†

“…By changing the counter anion from Tf 2 N to more hydrophobic bis(heptafluoropropane sulfonyl)imide (Hf 2 N), the average pore sizes of PPMs significantly decreased from 1546 nm to 77 nm. [ 66 ] These all‐PILs based PPMs can be readily utilized as carbon precursor, directly forming carbon membrane with well‐ preserved porous structures by vacuum pyrolysis method, which exhibit high performance for seawater desalination. The same group also reported the fabrication of a electrochemically active, semi‐metallic Se dispersed hierarchically porous carbon membrane through a bottom‐up electrostatic complexation and the direct carbonization of poly(ionic liquid) (PIL) membrane bearing Se(CN) 2– as counteranion (Figure 6j).…”

Fabrication of hierarchical porous polymer particles via blending strategy of water and polymer mixture

“…The prospective application of porous materials in a great variety of fields is widely recognized because of their valuable characteristics, 1, 2 such as high specific surface area, controllable mesopores, hollow architectures, feasible surface modifications and biocompatibility 3, 4 . It is generally considered that the appearance of nanopores with exactly controllable size and chemical activity 5, 6 leads to a variety of properties 7, 8 .…”

“…The prospective application of porous materials in a great variety of fields is widely recognized because of their valuable characteristics, 1,2 such as high specific surface area, controllable mesopores, hollow architectures, feasible surface modifications and biocompatibility. 3,4 It is generally considered that the appearance of nanopores with exactly controllable size and chemical activity 5,6 leads to a variety of properties. 7,8 Based on nanopore size of porous materials, pore materials were suggested by IUPAC (International Union of Pure and Applied Chemistry) to be divided into three categories, [9][10][11] namely microporous (<2 nm), mesoporous (2-50 nm) and macroporous (>50 nm).…”