This paper presents an experimental study on the manufacture of microcellular polycarbonate in a designed co-rotating twin-screw extrusion system using CO2 as a blowing agent. Open-cell microcellular polycarbonate foams in the form of hollow fiber were produced with a cell density on the order of 109-1010 cell/cm3 and an average cell size in the range of 5-10 μm. The effects of the processing conditions on the cell morphology and the cell-opening technique are described.
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