| 초록 |
We introduced sulforic groups on the surface of poly(ethylene terephthalate) (PET) with the aid of atmospheric pressure plasma treatment using Ar gas and the post-grafting of Na salt of p-styrene sulfonic acid (NaSS) in an aqueous solution. The density of surface grafting is enhanced by plasma treatment. Surface grafting also leads to a more hydrophilic PET film. After plasma treatment and grafting, conducting the poly(ethylene terephthalate)-graft- Na salt of p-styrene sulfonic acid/polyaniline(PET-g-NaSS/PANI) composite was synthesized by in situ polymerization of aniline with sulfonated PET substrate. This is namely introducing acid-base interaction of surface NaSS graft chains contaning sulfonic acid group and aniline monomer. Then, NaSS graft chains acting as dopants of PANI emeraldine salt were chemically bonded onto PET surface and the interaction would bring about strong adhesion force between PET substrate and PANI coating layer. The surface modification using plasma treatment was identified by the measurement of contact angles. The water contact angle, an indicator of the wettability of surface, decreased, owing to the oxygen-based polar functionalities on the surface. The changes in chemical structure of the functional group-grafted surface were investigated by Fourier transform infrared spectroscopy in the attenuated total reflectance mode (FTIR-ATR). The conductivity of PANI/sulfonated PET composite was measured by a standard four-point probe method. |
