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Preparation and Characterization of PTFE/PI Nanofiber Composite Assembled Sponges
Huizhong Liu,Dawei Li,Ying Shen,Bingyao Deng 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Due to the ultralow density and high specific area, nanofibrous sponges show great potential in the field offiltration and separation. To prepare nanofibrous sponges for high temperature smoke filtration, polytetrafluoroethylene(PTFE) was chosen due to its corrosion resistance and high temperature resistance. PTFE nanofiber prepared viaelectrospinning shows irregular concave-convex pores in the fiber body, which can improve the specific surface area andfurther enhance filtration performance. However, sponges made of PTFE nanofiber suffered from severe shrinkage, whichlimited the development in sponge products. In this study, polyimide (PI) nanofiber converted from polyamic acids (PAAs)nanofiber was introduced into the PTFE sponges to reinforce the dimensional stability. The parameters that influenced themorphology, porosity, shrinkage ratio, and thermodynamic properties of the composite sponges were also investigated. Moreover, the filtration performance of the composite sponges was tested. Results indicated that PTFE/PI compositenanofiber sponges possessed high porosity (94.34-98.12 %), excellent thermal stability (above 550 oC), and decent filtrationefficiency (the maximum filtration efficiency reached 99.97 % to PM 2.0) were prepared, which demonstrated the potential inthe field of high-temperature filtration.