Gridded Fibers' Restricted Melting Strategy for Gas Permeance and Binding Enhancement of the ePTFE/PPS Filter

Inthis work, a high-gas-permeance expanded polytetrafluoroethylene/griddedfibers/polyphenylene sulfide (ePTFE/GF/PPS) filter was developed byembedding the gridded fibers as the interlayer to restrict the meltingdiffusion behavior of poly(phenylene sulfide) (PPS). The influenceof gridded fibers with different melting temperatures on the air permeance,composite fastness, and heat tolerance was investigated. The resultsshow that copolyamide (PA) gridded fiber with low melting temperaturecan weaken the effect of PPS melting so as to increase the air permeanceof the ePTFE/PPS filter by 32%, which is suitable for low-temperatureenvironments below 160 degrees C. The ePTFE/PAN/PPS membrane had an8% increase in air permeance while maintaining the overall performancestable, with a heat tolerance of 200 degrees C. Poly(vinyl alcohol)(PVA) with a melting temperature close to that of PPS as the interlayerexhibited enhanced fastness as a compensation for the lower air permeancebecause of co-melting. All of the filters showed filtration efficienciesof above 99.99% and filtration resistances below 210 Pa in the particulatematter (PM) filtration experiment. The successful introduction ofthe gridded fiber as the intermediate layer provides a new perspectiveto design a composite filter with high gas permeance.