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Guo H, Li M, Li F, Zhu Q, Zhao Y, Wang F, Qin Z. Enhanced Wettability of PTFE Porous Membrane for High Temperature Stable LIB Separator. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202000218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hongxia Guo
- Faculty of Materials and Manufacturing Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
| | - Mingye Li
- Faculty of Materials and Manufacturing Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
| | - Fan Li
- Faculty of Environmental and Life Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
| | - Qizhen Zhu
- State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beisanhuan East Road 15 Beijing 100029 China
| | - Yao Zhao
- Faculty of Materials and Manufacturing Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
| | - Feng Wang
- Faculty of Environmental and Life Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
| | - Zhenping Qin
- Faculty of Environmental and Life Beijing University of Technology Nanmofang Street, Pingleyuan No. 100 Beijing 100124 China
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Cross-Linking Combined with Surfactant Bilayer Assembly Enhances the Hydrophilic and Antifouling Properties of PTFE Microfiltration Membranes. SEPARATIONS 2021. [DOI: 10.3390/separations9010002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The inherent strong hydrophobicity of Polytetrafluoroetylene (PTFE) microfiltration membranes results in low separation efficiency and easy contamination. In order to enhance its hydrophilic and antifouling properties, we first modified the PTFE microfiltration membrane by using Polyethylene glycol laurate (PEGML) for first layer deposition and then used Polyvinyl alcohol (PVA)/citric acid (CA) cross-linked coatings for second layer deposition. The Scanning Electron Microscope (SEM) results showed that the fibers and nodes of the modified PTFE microfiltration membrane were coated with PVA/CA hydrophilic coating. FT-IR Spectromete and X-ray photoelectron spectrometer (XPS) analysis results confirmed that crosslinking of PVA and CA occurred and that PEGML and PVA/CA were successfully deposited onto the membrane surface. The modification conditions were optimized by hydrophilicity testing, and the best hydrophilicity of the modified membrane was achieved when the crosslinking content of PEGML was 2 g·L−1, PVA was 5 g·L−1, and CA was 2 g·L−1. PTFE microfiltration membranes modified by the optimal conditions achieved a water flux of 396.9 L·m−2·h−1 (three times that of the original membrane) at low operating pressures (0.05 MPa), and the contact angle decreased from 120° to 40°. Meanwhile, the modified PTFE microfiltration membrane has improved contamination resistance and good stability of the hydrophilic coating.
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