Abstract
Random copolymers containing poly(vinyl alcohol) (PVA) and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) were synthesized with degrees of hydrolysis 85–99%. The simple synthesis strategy is based on free radical polymerization in water with subsequent alkaline hydrolysis in methanol. The chemical structures of PVA-co-PAMPS copolymers with different PAMPS molar compositions (15.2, 25.1, 37.7 and 48.0 mol%) were fully characterized by FTIR and 1H NMR spectroscopy. Differential scanning calorimetry (DSC) and thermogravimetric analysis indicated that PVA-co-PAMPS random copolymers presented higher thermal stabilities than pure PVA. The ion exchange capacity (IEC) values between 0.74 and 1.70 mmol H+/g are well correlated with the molar composition of PAMPS. The copolymers were highly soluble in water and exhibited good film-forming ability, for both dense and porous membranes. Thus, PVA and PAMPS appropriated combinations will allow to fine-tune the physicochemical properties of these copolymers and may lead to several potential applications as polymeric membranes.
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