Splaying hyperthin polyelectrolyte multilayers to increase their gas permeability

Abstract

The concept of splayed, hyperthin polyelectrolyte multilayers (PEMs) is introduced in which a bulky, hydrophilic and charged pendant group is used to increase the gas permeability of a PEM without reducing its permeation selectivity. Proof of principle studies are reported using nm-thick PEMs made from poly(sodium 4-styrene sulfonate) () and poly(allylamine hydrochloride) () bearing bulky cobaltocenium ions.

Thin-skinned intrinsically defect-free asymmetric mono-esterified hollow fiber precursors for crosslinkable polyimide gas separation membranes

“…Membrane-based separation can greatly reduce energy consumption for separating gas mixtures, compared to traditional thermally-driven separation processes, such as absorption and cryogenic distillation [1][2][3][4][5][6][7]. Among different types of membrane materials, polymers are the dominant membrane materials, as essentially all large scale industrial gas separation membranes are polymeric in nature [8][9][10][11].…”

Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

“…To test this strategy, we covalently coupled a bulky cobaltocenium ion along a PAH backbone at varying concentrations and then constructed PEMs using PSS as the polymeric counterion (Figure ) . When membranes were grown to a thickness of ca.…”

“…2020, 20, 163 -173 polymeric counterion (Figure 7). [44] When membranes were grown to a thickness of ca. 18 nm, the observed permeance for H 2 across membranes containing the highest loading of cobaltocenium ion (5 c) was significantly greater than for analogous membranes made exclusively from PAH and PSS; i. e., 90 GPU as compared to 51 GPU.…”