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The apparent surface charge densities of grafted poly(acrylonitrile) (PAN) membranes (determined by measurement of zeta potential) were compared with net charge densities (determined by potentiometric titration) in order to examine the effects of hydrophilic and hydrophobic graft chains at the pore surface. Membranes with hydrophilic graft chains showed much smaller net charge densities than membranes...
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