Characterization of Poly(Vinyl Alcohol) Membranes Cross-Linked by Aldehyde-Substituting Cyclotriphosphazene |
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| Authors: | Yawen Huang Jianwei Fu Xiaobin Huang Xiaozhen Tang |
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| Institution: | School of Chemistry and Chemical Technology , Shanghai Jiao Tong University , Shanghai, China |
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| Abstract: | A new type of cross-linker, based on cyclotriphosphazene with six aldehyde groups, was used for the cross-linking of poly(vinyl alcohol) membranes. FTIR-ATR analysis indicated that cyclophosphazene reacted with poly(vinyl alcohol) by forming C–O–C bonds. TGA and DTG analysis showed that cross-linking improved the thermal stability. The swelling degree and pervaporation properties of cross-linked PVA membranes were also characterized. With increasing cross-linker concentration, swelling degrees and flux decrease while separation factors increase. Compared with PVA membranes cross-linked by glutaraldehyde, PVA membranes cross-linked by cyclophosphazene exhibited better selectivity and permeation rate. |
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| Keywords: | cross-linking cyclotriphosphazene membranes pervaporation dehydration poly(vinyl alcohol) |
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