Abstract
AbstractMembrane formation by immersion precipitation has been investigated for two different polymer blends: poly(ether sulfone) / poly(vinyl pyrrolidone), a common blend for obtaining high performance UF or MF membranes, and poly(ether sulfone) / poly(styrene). The latter blend contains a polymer as additive that is not soluble in the precipitant used. It yields structures that confirm the fundamental basis of a model describing the formation of membranes from polymer blends. It appears that the membrane formation is dominated by the diffusional behaviour of the polymers relative to each other.A general classification of membrane structures from a polymer blend is presented; it is established that spinodal decomposition may well be responsible for the open porous structures usually found when using a polymer blend such as poly(ether sulfone) and poly(vinyl pyrrolidone).
Published Version
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