Water sorption and transport in blends of polyethyloxazoline and polyethersulfone

Water Vapor Sorption, Diffusion, and Dilation in Polybenzimidazoles

“…Similar behavior was observed by Burgess et al. for water vapor in poly­(ethylene terephthalate) (PET) and poly­(ethylene furanoate) (PEF) and by Schult and Paul for water vapor in poly­(vinylpyrrolidone) (PVP), polysulfone (PSF), polyethyloxazoline (PEOX), and poly­(ether sulfone) (PES). ,, The water uptake for both PBIs returns to zero after desorption, indicating that the sorption process is reversible.…”

Sorption kinetics and equilibrium uptake for water vapor in soft‐contact‐lens hydrogels

“…For all four polymers, absorption and desorption data overlap at high activities, whereas they form a hysteresis loop at low activities; the amount of solvent in each polymer film is larger during the desorption process than that during the sorption process at the same water activity. A similar absorption/desorption hysteresis has been observed for several glassy water/polymer42–46 and organic solvent/polymer mixtures 47–49. We believe that the deviation of the desorption data from the sorption data is connected to a rubber‐to‐glass transition occurring during water‐vapor absorption/desorption.…”

Phototransparency and water vapor sorption properties of ABA‐type triblock copolymers derived from 6FDA‐TeMPD and poly(2‐methyl‐2‐adamantylmethacrylate)

“…The polymer membranes were more stable at a lower region, whereas the membranes were more affected by the membrane swelling and plasticization induced by the sorbed water molecules at a higher region. Permanent gases (i.e ., H 2 , O 2, N 2 , and CO 2 ) that did not strongly interact with the polymer generally showed increased solubility with increased free volume of polymer, which can be expected theoretically . PI, PSF, PA, OH‐containing Ad, PSF + PVP, PES + PEOX, and SUPI exhibited an opposite trend at low and high pressures because the membrane structure changed (i.e., increased FFV ), such as membrane swelling and plasticization.…”