Abstract
Ultra-high molecular weight polyethylene (UHMWPE) membranes were prepared by 5 wt% UHMWPE/paraffin oil gels via thermally induced phase separation method and dried in air without significant collapse. The UHMWPE membranes were annealed at 110 °C for increasing the pores size in order to decrease the capillary forces. Furthermore, a new multiple stage extractant exchange drying (MSEED) technique was adopted to decrease the shrinkage of the UHMWPE membranes. Specifically, the paraffin oil was extracted by dichloromethane, then dichloromethane was replaced by ethanol, next ethanol could be exchanged to other liquid which is non-affinity with UHMWPE, for example water. UHMWPE membranes (annealing for 25 min) dried by dichloromethane-ethanol–water-air process have the lowest volume shrinkage of 16.5% and the porosity is as high as 88.29%. Moreover, compared with supercritical CO2 (SC-CO2) drying, atmospheric drying UHMWPE membranes have a lower pure water permeance, but a higher carbon particles rejection.
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This research is supported by Shanghai International S&T Cooperation Fund (No. 16160731302) and the Natural Science Foundation of China (No. 51473031).
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Quan, J., Song, Q., Yu, J. et al. Atmospheric Drying UHMWPE Membranes via Multiple Stage Extractant Exchange Drying Technique. Adv. Fiber Mater. 4, 235–245 (2022). https://doi.org/10.1007/s42765-021-00102-x
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DOI: https://doi.org/10.1007/s42765-021-00102-x