Waterproof-breathable PTFE nano- and microfiber membrane as high efficiency PM2.5 filter

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Abstract

This study shows the feasibility of using electrospinning technique to prepare polytetrafluoroethylene/poly (vinyl alcohol) (PTFE/PVA) nanofibers on PTFE microfiber membrane as substrate. Then, PVA in the fiber membrane was removed by thermal treatment at about 350 °C. Compared to PTFE microfiber substrates, the composite PTFE fiber membranes (CPFMs) have improved filtration efficiency by 70% and water contact angle by 23°. Experimental test data showed that the water contact angle of the sample increased from about 107° to 130°, the filtration efficiency of PM2.5 increased from 44.778% to 98.905%, and the filtration efficiency of PM7.25 increased from 66.655% to 100% due to the electrospun PTFE nanofiber layer. This work demonstrates the potential of CPFMs as a filter for the production of indoor or outdoor dust removal and industrially relevant gas filtration.

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Li, X., Wang, X. X., Yue, T. T., Xu, Y., Zhao, M. L., Yu, M., … Long, Y. Z. (2019). Waterproof-breathable PTFE nano- and microfiber membrane as high efficiency PM2.5 filter. Polymers, 11(4). https://doi.org/10.3390/polym11040590

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