Reverse Osmosis through Poly(4-Vinylpyridine-co-Methacrolein) Membranes Containing Functional Crosslinks of Complexing Ability

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Abstract
Membranes containing complex-formable crosslinks were obtained from poly(4-vinylpyridine-co-methacrolein) (4VL) when 4VL was crosslinked by the reaction of formyl groups of 4VL with malonyl dihydrazide (MD) or triethylene tetramine. The effect of monomer composition of 4VL, MD charged, and metal salts on the membrane performance in reverse osmotic separation of NaCl and CoCl2 was investigated. The membranes of a high methacrolein content tended to be permselective, showing a maximal difference of about 60% in rejection between the two salts. 4VL membranes were mostly more permselective than poly(4-vinylpyridine-co-methyl vinyl ketone) membranes containing analogous crosslinks.