This study aimed to develop a new method for bonding a hydrophilic plasma polymer film to a polytetrafluoroethylene (PTFE) surface through a plasma-solution interface reaction. A PTFE sheet of 0.2 mm in thickness was used. A dibasic acid ester with a low melting point, high boiling point, low vapor pressure, and low viscosity was used, and it had high solubility in various reactants and low reactivity to low-temperature plasma. Furthermore, trans-stilbene and its derivatives were used as reactants. A 13.56 MHz radio wave was applied by inductive coupling and the low-temperature plasma generated was used for the plasma-solution interface reaction. When Ar+H 2 O or O 2 +H 2 O was used as the plasma process gas and a derivative bearing a hydrophilic group was used as the reactant, a hydrophilic polymer thin film with a contact angle less than 40º was obtained. Attenuated total reflectance/Fourier transform infrared spectroscopy revealed broad absorption caused by the OH group in the 3500 cm -1 region, and absorption due to the stretching vibration of C-H coupling was observed at 2800-3000 cm -1 .
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