| 초록 |
Polyimides have extensive applications ranging from aerospace to microelectronics, optoelectronics, composites, and fiber optics due to their excellent mechanical properties, electrical properties, and thermal resistance. However, applications of polyimides are limited by their hydrophobic surfaces, which results in poor wettability or adhesion. In this work, the effect of corona discharge treatment on surface properties of polyimide film is investigated in terms of Fourier Transform-IR (FT-IR), X-ray photoelectron spectroscopy (XPS), and contact angles. And, the adhesion characteristics of the film are studied in peel strengths of polyimide coatings. As a result, polyimide surfaces treated by corona discharge lead to an increase of oxygen-containing functional groups or polar component of the surface free energy, resulting in improving the adhesion characteristics of the polyimide/copper foil. However, the surface energy of the film is decreased as the aging time increases. These results can be discussed in the formation of surface functional groups or deterioration of reactive sites of polyimde film in the presence of corona treatment with aging time.
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