Abstract
A series of hydrophilized porous polytetrafluoroethylene (PTFE) membranes were prepared by a mussel-inspired coating method. Various types of phenol derivatives possessing different number of hydroxide groups at different position such as hydroquinone, pyrogallol, hydroxyhydroquinone were applied along with polyethyleneimine (PEI) to seek for the fast and stable surface modification. The co-deposition kinetics of phenol/PEI pair on the porous PTFE membranes was examined using the ultraviolet spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Surface morphology and pore diameter were analyzed by the field emission scanning electron microscopy and mercury porosimetry. To confirm the complete surface hydrophilicity, water contact angle was measured as a function of time for different co-deposition pairs. Among several phenol derivatives paired with PEI, hydroxyhydroquinone showed the fastest deposition rate (in about 40 min) for excellent hydrophilicity and stability. The chemical modification method applied in this study showed the long-term stability in commonly used and harsh solvents including acidic and basic solutions compared to the other physical and chemical methods previously reported.
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