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摘要
Poly(ethylene terephatalate) (PET) films were treated with two different helium plasma sources, i.e. a dielectric barrier discharge working at atmospheric pressure and a capacitively coupled discharge at low pressure. After exposure in these two environments, the polymer films have an improved hydrophilic character, the magnitude of the effects is different. The increase of the surface energy was found to be almost entirely due to the increase of the polar component, whereas the dispersive component remains unmodified. The surface chemistry, analyzed by the ATR-FTIR technique, is not modified during the treatment. Thus, in the treated polymers spectra new absorbance bands are not identified. Still some variations of the PET characteristic bands were found. In the UV-Vis spectral range the modified polymers have modified absorption bands, associated with electronic transition in C=C and C=O bonds.
- 出版日期2008-11
