Abstract
A novel solvent, camphene, was used to prepare microporous polypropylene tubular membranes via thermally induced phase separation (TIPS). In this process, camphene was removed by either sublimation or extraction. The effect of the solvent-removal on the structure and properties of the resulting membrane was studied. Microscopic observation and wide angle X-ray scattering indicate that the morphology and crystalline structure difference is minor. Thermal analysis and tensile tests reveal that the crystallinity and breaking strength of the tubular membrane from the extracting method are slightly higher than those for the sublimating method. Porosity measurements show that the sublimation method can yield membranes with slightly higher porosity than the extraction method. Furthermore, permeation results indicate that membranes from extraction have a smaller permeation rate and higher retention. Therefore solvent-extraction can produce a denser membrane structure than sublimation can.
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Yang, M.C., Perng, J.S. Comparison of solvent removal methods of microporous polypropylene tubular membranes via thermally induced phase separation using a novel solvent: Camphene. J Polym Res 6, 251–258 (1999). https://doi.org/10.1007/s10965-006-0095-y
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DOI: https://doi.org/10.1007/s10965-006-0095-y