低気圧放電によるPTFEの表面処理

抄録

PTFE (Poly-tetra-fluoro-ethylene) is one of the most chemically stable polymers. This means the small surface energy and the poor adhesion property. However, the small surface energy means the difficulty on the surface treatment to give the chemical and/or physical functions to the surface. Many studies concerned with the surface processing of polymers by means of gaseous discharge have been carried out.
The authors have studied on the electron multiplication mechanism under high E/n conditions. Consequently, it was predicted that many ions with high kinetic energy exist in the ionizing space. Their energies are some 10 or 100 times higher than binding energy of PTFE. Then, surface processing of PTFE by use of high E/n discharge is expected to introduce new functions onto the PTFE surface. In this study, the adhesive strength of the processed PTFE was measured and was compared with the change of the surface energy, C_1s spectra by XPS, morphology observed by SEM and weight of sample. As a result, the surface energy increased with respect to the processing time, and the adhesive strength showed a maximum and decreased for long processing time. The weight of sample decreased with processing time. Therefore, it is concluded that the optimum condition for the improvement of the property exists.