Trimethyl borate‐treated polytetrafluoroethylene micropowders with improved hydrophilic and adhesive properties based on coordination bond theory

Abstract

Based on coordination bond theory, the current study proposes a novel method to modify the surface of the polytetrafluoroethylene (PTFE) micropowders. The samples were treated with trimethyl borate in the n‐hexane solution, and this improves the hydrophilic and adhesive properties of PTFE micropowders. The surface properties of treated samples were evaluated by using X‐ray photoelectron spectrometry, contact angle measurement, settling velocity measurement, and adhesive property measurement. Trimethyl borate treatment led to an evident increase in the hydrophilic and adhesive properties of PTFE micropowders. The water contact angle of PTFE micropowders decreased from 115° to 85.4°, while the ethanol contact angle of PTFE micropowders decreased from 39.8° to 11.2° owing to the combination of the trimethyl borate with PTFE micropowders as indicated by the X‐ray photoelectron spectrometry spectra. Furthermore, the settling velocity of powders dispersed in ethanol/water (1/10) solution (pH = 8.5) improved (with a settlement ratio exceeding 20% in 60 minutes), and the fracture stress of the powders/resin composite membrane increased from 4.68 to 6.67 MPa while the elongation at the yield of membrane increased from 25.4% to 31.5%.

Development of a High‐Frequency Polytetrafluoroethylene (PTFE)‐Based Laminate With An Ultra‐Low Dielectric Constant by Combination of Ceramic Hollow Spheres and PTFE Resin

“…According to the coordination bond theory, the fluorine atoms in PTFE are particularly electronegative and can easily form hydrogen bonds with the hydrogen atoms in the amino group of KH550, the epoxy group of KH560 and the methylene group of KH570 [16] . In addition, no hydrogen bond is formed between FAS and PTFE.…”

“…According to the coordination bond theory, the fluorine atoms in PTFE are particularly electronegative and can easily form hydrogen bonds with the hydrogen atoms in the amino group of KH550, the epoxy group of KH560 and the methylene group of KH570. [16] In addition, no hydrogen bond is formed between FAS and PTFE. As the electronegativity of the O, N and C atoms decreases in turn, the interaction forces between the fluorine atoms in PTFE and the hydrogen atoms of the terminal group in KH560, KH550 and KH570 decrease in turn.…”

Effect of Oxyfluorination of PFA-Coated Metal Mesh with Superhydrophobic Properties on the Filtration Performance of SiO2 Microparticles

“…Among several methods, the chemical wet method [ 14 , 15 , 16 , 17 , 18 ] and the plasma dry method [ 19 , 20 , 21 , 22 , 23 , 24 , 25 ] have been mainly studied to increase the water permeability of surfaces coated with fluorine-based polymers. The Vankelecom research team showed improved permeability by modifying the surface of the PVDF-coated membrane through crosslinking with para-xylenediamine (XDA) [ 26 ].…”