To enhance the protective barrier property, the inner surface of polyethylene pipe was modified by the thin film coating of perfluoropropene plasma polymer. The chemical structures of the ultra thin plasma coatings, treated at different discharge powers, were characterized by ESCA. The protective barrier properties were interrelated to its chemical structures which depended on the discharge power. To estimate the protective barrier characteristics, oxygen permeability coefficients were measured. The permeabilities of plasma treated pipes were reduced, compared with untreated sample, up to 31%. It was observed that increasing the discharge power gave rise to increase in the contents of CF₂ and CF₃ groups and decrease in the degree of crosslinking and protective barrier characteristics. The best result of the barrier characteristic was obtained from the coating treated at 20W discharge power(350-500Å in thickness).

여리가지 기체, 증기 및 액체에 대한 고분자물질의 보호성차단특성은 실용면에서 대단히 중요하다. 본 연구에서는 polyethylene pipe의 차단특성을 향상시키기 위한 목적으로 perfluoropropene 플라즈마 중합박막을 polyethylene pipe 내부에 코팅하였다. 출력에 따른 박막의 화학적구조를 ESCA에 의해 조사하여 차단특성과 화학적 구조와의 관련성을 연구하였다. 차단특성은 산소투과계수로서 얻어졌고 최고 31%의 향상을 보였다. 방전출력을 증가 시키면 플라즈마 중합박막의 CF₂와 CF₃성분이 증가하면서 가교결합이 감소하고 차단특성도 감소하였다.