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High‐performance membranes for pervaporation II. Crosslinked poly(vinyl alcohol)–poly(acrylic acid) blends
Author(s) -
Ping Zhenghua,
Nguyen QuangTrong,
Essamri Azouz,
Néel Jean
Publication year - 1994
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1994.220050604
Subject(s) - pervaporation , vinyl alcohol , membrane , permeation , acrylic acid , materials science , polymer chemistry , chemical engineering , crystallinity , permeability (electromagnetism) , polymer , chemistry , composite material , copolymer , biochemistry , engineering
Dense membranes made by crosslinking of poly(vinyl alcohol) (PVA) with poly(acrylic acid) (PAA) were prepared and tested in pervaporation and differential permeation of water–alcohol mixtures. Instead of a decrease of permeation flux as generally observed with most crosslinking agents, an increase in the permeability was observed with PAA crosslinked membranes at low PAA contents. The permeation flux increases with PAA contents in the polymer with no selectivity reduction for membranes containing less than 15 wt. % PAA. The membranes show good performances to water–2‐propanol and water–ethanol mixtures, i.e. high fluxes and high selectivities to pure water. The membranes were stable and highly permeable to water. The enhancement of the permeability of PVA can be explained by a reduced crystallinity and an improved diffusivity due to the presence of PAA.