| 초록 |
After atmospheric pressure plasma treatment of polypropylene (PP) film surface, we measured the contact angle of the surface by using polar solvent (water) and non-polar solvent (diiodomethane). We also calculated the surface free energy of PP film by using the measured values of contact angles. And then we analyzed the change of contact angle and surface free energy with respect to the conditions of atmospheric pressure plasma treatment. Upon each condition of atmospheric plasma treatment, contact angle and surface free energy showed optimum value or leveled off. Through AFM analysis, we also observed the surface morphology and the change of the roughness before and after plasma treatment. The surface roughness of PP film showed the highest value when atmospheric pressure plasma treated time was 90 seconds. Finally, we analyzed the change of components on the PP film surface through XPS. As the result of analysis, we observed that polar functional groups such as (-CO, -C=O, -COO) were introduced on the PP film surface after atmospheric pressure plasma treatment. |
