Solvent nanofiltration through high permeability glassy polymers: Effect of polymer and solute nature

Surface modification of PTMSP membranes by plasma treatment: Asymmetry of transport in organic solvent nanofiltration

“…High free volume glassy polymers show the same level and order of retention for the low molecular mass dyes, independently of their different polymer nature [49]. …”

“…glassy polymers with a high free volume content, such as PTMSP, PMP and PIM-1 [45][46][47][48][49][50][51][52], are the promising membrane materials for diverse applications. Due to the rigid nature of their macromolecular chains (T g >200 o C), the porous structure provided by the free volume elements with the dimensions of about 1 nm is formed upon casting from polymer solutions, and no subsequent treatment (e.g.…”

“…As a result, the intrinsic microporous structure of PTMSP is responsible for much higher ethanol permeability as compared with the permeability of rubbery polymers such as the cross-linked polydimethylsiloxane or polyurethane (see Fig. 5) [45,46,49]. Fair mechanical characteristics of PTMSP and PIM-1 allowed their application as thin film selective layers (with a thickness below 1 µm) in the preparation of the high-performance OSN membranes [47,50].…”

Recent Advances in Polymeric Solvent‐Resistant Nanofiltration Membranes

“…Among these developed materials, glassy polymers with a high free volume fraction have generated significant concern due to their intrinsic microporosity. [98][99][100][101][102][103] NF membranes based on these polymers are expected to have a high flux and result in a high rejection due to their higher diffusion. Volkov et al [98][99][100][101] fabricated SRNF membranes using a type of glassy polymer with a high free volume fraction (up to 25%), named poly(1-(trimethylsilyl)-1-propyne) (PTMSP).…”

“…100 Polymers with intrinsic porous and derived copolymers attract a lot concern recently for their high free volume and ultra-stable in polar (alcohols, ketones), aromatic (benzene, toluene), nonpolar (alkanes), or aprotic polar (DMF, NMP, DMSO) solvents. 102,103 Fritsch et al 102 designed several kinds of polymers of intrinsic microporosity (PIMs) and found that the PIMs can also be generated by coating the material on porous PAN membranes, followed cross-linking with PEI to fabricate a new type of composite SRNF membrane. In a continuous experiment that was recorded over 200 h, the permeability of the composite membrane was extremely stable, and the 90% rejection of the composite membrane was less than 200 111 These spiral-wound modules were stable in acetone, THF and DMF and can be easily used even after the membranes have been dried out.…”