![]() Swelling experiments performed in water + organic mixtures at 30☌ were used to explain the pervaporation results. Membrane performance was assessed by calculating flux and selectivity. Membranes were tested for pervaporation dehydration of isopropanol and tetrahydrofuran (THF) at 30☌ in close proximity to their azeotropic compositions. Blend compatibility was studied by differential scanning calorimetry, and Fourier transform infrared spectroscopy was used to study membrane crosslinking. Chitosan was used as the base component in the blend system, whereas PVA concentration was varied from 20 to 60 wt %. Blend membranes of a natural polymer, chitosan, with a synthetic polymer, poly(vinyl alcohol) (PVA), were prepared by solution casting and crosslinked with a urea formaldehyde/sulfuric acid (UFS) mixture.
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