Abstract
A series of polyurethane membranes were prepared by direct immersion of a polyurethane/dimethylformamide solution into a water bath at different temperatures. Depending on the temperature of the water immersion bath the films exhibited variations in morphology and mechanical properties. As the temperature of the immersion bath was increased, the membrane structure changed from a cellular to a particulate morphology. The properties of polyurethane membrane such as mechanical and gas permeability were measured. It is proposed that the change in membrane structure is due to the variation of polymer chain mobility, influenced by the water bath temperature, during membrane formation
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