Fundamentals of Membrane Gas Separation

Multifunctional thiols as additives in UV-cured PEG-diacrylate membranes for CO2 separation

“…Since the early 1980s, it has been well documented that membranes based on poly(ethylene glycol) (PEG) have a high selectivity for carbon dioxide (CO 2 ) [5][6][7][8][9], a common contaminant in many industrial gas purification processes as well as a key component in atmospheric packaging for certain foods [10]. It was suggested that the reason for this selectivity is a Lewis acid-base interaction between the polar, electron-rich ether units on the polymer backbone (the Lewis base) and CO 2 (the Lewis acid) [5].…”

PEG Containing Thiol–Ene Network Membranes for CO2 Separation: Effect of Cross-Linking on Thermal, Mechanical, and Gas Transport Properties

“…While the gas combinations involved are quite varied, CO 2 is a common component. − Natural gas purification, power plant flue gas capture, modified atmosphere packaging for fresh produce, and hydrogen purification all require CO 2 separation. − Poly(ethylene glycol) (PEG) is known for its high CO 2 solubility selectivity derived from the Lewis acid–base interaction between CO 2 and ether groups . PEG has been researched extensively as a selectivity-providing component in polymer membranes. − The affinity-based selectivity that PEG provides is advantageous since low- T g rubbery polymers may be used. Rubbery polymers do not undergo physical aging and can also have extremely high permeability.…”

Recent Advances in Adsorptive Nanocomposite Membranes for Heavy Metals Ion Removal from Contaminated Water: A Comprehensive Review

“…Phase inversion is the controlled de-mixing (liquid–liquid de-mixing) of homogeneous polymer solutions into two solid and liquid phases [ 183 ]. In the process of demixing, the polymer-rich phase becomes destabilized as a result of an increase in polymer concentration and a decrease in polymer solubility.…”