ISSN 2594-5327
51th Congresso anual — Vol. 52 , num. 1 (1997)
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Abstract
In this work plane microporous membranes used in microfiltration and ultrafiltration processes were obtained. Membrane preparation was accomplished by phase inversion process, by means of immersion precipitation technique, in which a polymeric solution film is immersed into a nonsolvent bath. A new polymer system was analyzed, which is not commonly used in membrane synthesis by phase inversion. The solutions were composed of polycarbonate, N-methyl-2-pyrrolidone as solvent and water as nonsolvent. The influence of several parameters on the membranes morphologies, such as polymer solution composition and exposure time before immersion in precipitation bath was investigated. The morphology was observed through Scanning Electron Microscopy. For better understanding of the mechanisms involved on membrane formation, the precipitation kinetics was also observed by means of light transmission experiments. The viscosity and cloud points of all polymer solutions were determined and related to membrane morphology. The effect of an additive into the polymer solution, an inorganic salt, was also studied, leading to conditions appropriated to spin hollow fibers. Membranes with different morphologies were obtained. The results were related to the studied synthesis parameters, using the basic principles of membrane formation by phase inversion technique, looking forward to predicting the behavior of polycarbonate systems. The results obtained in this work made possible to establish criteria to control morphology and transport properties of flat membranes using polycarbonate as base polymer.
In this work plane microporous membranes used in microfiltration and ultrafiltration processes were obtained. Membrane preparation was accomplished by phase inversion process, by means of immersion precipitation technique, in which a polymeric solution film is immersed into a nonsolvent bath. A new polymer system was analyzed, which is not commonly used in membrane synthesis by phase inversion. The solutions were composed of polycarbonate, N-methyl-2-pyrrolidone as solvent and water as nonsolvent. The influence of several parameters on the membranes morphologies, such as polymer solution composition and exposure time before immersion in precipitation bath was investigated. The morphology was observed through Scanning Electron Microscopy. For better understanding of the mechanisms involved on membrane formation, the precipitation kinetics was also observed by means of light transmission experiments. The viscosity and cloud points of all polymer solutions were determined and related to membrane morphology. The effect of an additive into the polymer solution, an inorganic salt, was also studied, leading to conditions appropriated to spin hollow fibers. Membranes with different morphologies were obtained. The results were related to the studied synthesis parameters, using the basic principles of membrane formation by phase inversion technique, looking forward to predicting the behavior of polycarbonate systems. The results obtained in this work made possible to establish criteria to control morphology and transport properties of flat membranes using polycarbonate as base polymer.
Keywords
microporous membranes, polycarbonate, ultrafiltration, microfiltration
microporous membranes, polycarbonate, ultrafiltration, microfiltration
How to cite
Luccio, Marco Di; Borges, Cristiano Piacsek; Nobrega, Ronaldo.
POLYCARBONATE AS BASE POLYMER FOR MICROPOROUS MEMBRANES,
p. 1350-1366.
In: 51th Congresso anual,
São Paulo, Brasil,
1997.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00087-1350-1366
