Abstract
In order to research the influence of cluster structure on the performances of membranes prepared through immersion precipitation phase inversion technique when water was used as external coagulant, in this paper, two types of water were prepared from distilled water and were used as external coagulant at room temperature. One type (water I) was prepared from boiled distilled water and another type (water II) was prepared from ice. Six polyethersulfone membranes were prepared by using polyvinylpyrrolidone as additive. Pure water flux, permeation flux of BSA solution and rejection to bovine serum albumin of the membranes were investigated. It was found that according to the statistically experimental results, the membranes prepared in water II always had larger pure water flux, permeation flux of BSA solution, rejection and swelling ratio than the membranes prepared in water I. Consequently, the types of water external coagulant had some influences on the separation performances of the prepared membranes but had no effects on the surface chemical groups. However, the present morphology characterization technology, such as SEM couldn’t detect the tiny difference in the pore structures.
Highlights
Immersion precipitation phase inversion technique is a common method for the preparation of polymer separation membranes, such as ultrafiltration membranes and nanofiltration membranes [1]
There is no research report on if the water types or water cluster structures will influence the membrane performances when water is used as external coagulant during immersion precipitation phase inversion process
Two types of water were prepared from distilled water and were used as external coagulant at room temperature, 20oC
Summary
Immersion precipitation phase inversion technique is a common method for the preparation of polymer separation membranes, such as ultrafiltration membranes and nanofiltration membranes [1]. For this membrane preparation technique, the nascent polymer membranes (hollow fiber or flat sheet membranes) need to be dipped in a liquid external coagulant to take place the phase inversion process. For. As our best knowledge, there is no research report on if the water types or water cluster structures will influence the membrane performances when water is used as external coagulant during immersion precipitation phase inversion process. We prepared two types of water and used them as external coagulant to research the above question. We think that the basic research work will be benefit to the preparation of ultrafiltration or nanofiltration membranes
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