After the preparation of semi-IPN separation membranes of calcium salt of pectin (CaPectin)/water-soluble polymer, the effects of the types, molecular weights and contents of the water-soluble (linear) polymer on the flux and rejection of the separation membrane were examined, with the following results: 1) Fluxes of CaPectin/water-soluble polymer semi-IPN separation membranes (composition ratios by weight, 9/1 and 4/1) increase in the order of CaPectin alone < starch < poly(ethyleneglycol) (PEG) (Mw: 3.0×10{sup}3) < methylcellulose (MC) ≈ polyvinylalcohol (PVA) (Pn: 1.9×10{sup}3) < polyvinylpyrrolidone (PVP) (Mw: 3.6×10{sup}5) < PEG (Mw: 5.0×10{sup}5). The membranes of the composition weight ratio 4/1 showed higher fluxes than those of the composition weight ratio 9/1. 2) CaPectin/PEG and CaPectin/PVP semi-IPN separation membranes had the flux increased with increasing molecular weight of PEG and PVP. 3) In any of the foregoing cases, a nearly reverse correlation was observed between the flux and the rejection.
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