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Abstract

Microporous films from immiscible blends were produced via melt processing and post-step treatments. Polystyrene (PS)/polypropylene (PP) and poly(ethylene terephthalate) (PET)/polypropylene blend systems with different viscosity ratios were studied. The blends were first compounded in a co-rotating twin-screw extruder and subsequently extruded through a sheet die to obtain the precursor films. These were uniaxially or biaxially drawn (100–400%) with respect to the original dimension to induce microporous structure and post treated at elevated temperature to maintain the porous structure which consisted of uniform microcracks in the order of a few hundred nanometers. The fabrication process here is shown to be a promising technique for producing microporous films that can be used for liquid and gas separations.

Keywords

microporous film immiscible blends melt processing methanol permeability PP PS PET membranes

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References

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2. H.S. Bierenbaum , R.B. Isaacson , M.D. Druin , and S.G. Plovan , “Microporous polymeric films”, I&ECProd. Res. Develop, 13, 2-2 (1974).

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Preparation of Microporous Films from Immiscible Blends via Melt Processing

Abstract

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