DLC 코팅에 의한 PVdF-HFP 막의 표면변화 및 접촉각 연구
Study of surface modification and contact angle by electrospun PVdF-HFP membrane with DLC coating
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초록
전기방사법(Electrospinning technique)을 이용하여 PVdF-HFP(Poly vinylidene fluoride-co-hexafluoropropylene) 멤브레인을 제조하고, 그 멤브레인 표면위에 DLC(Diamond-like carbon) 코팅공정을 적용하여 멤브레인의 표면변화 및 접촉각변화를 조사하였다. Ar 플라즈마 처리시간 및 처리조건에 따라 PVdF-HFP 멤브레인 파이버 표면이 주름(wrinkles)형태로 변화 하였다. 이러한 Ar 플라즈마 처리가 된 PVdF-HFP 멤브레인은 초친수성(super-hydrophilic) 특성으로 변했지만, 초친수성PVdF-HFP 멤브레인에 DLC 코팅공정을 적용하면 반대로 초소수성(super-hydrophobic) 특성으로 변화되었다. 이러한 특성을가진 표면을 접촉각 측정과 XPS, FE-SEM 측정으로 분석하였다. 따라서 화학적 조성과 표면 형상에 의해 접촉각 특성을가지는 것으로 확인하였다.
Abstract
Poly vinylidene fluoride-co-hexafluoropropylene (PVdF-HFP) membrane were prepared by the electrospinningtechnique. We had applied a DLC coating process and then the surface of the membrane and the contact angle change wasinvestigated. Electrospun fibrous PVdF-HFP membrane surface became to wrinkled shape by Ar plasma treatment andtreatment conditions. The wrinkled surface of PVdF-HFP membrane became super-hydrophilic. However, after DLC coatingprocess, it became super-hydrophobic. The resulting surfaces were characterized by water contact angle measurement, X-rayphotoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FE-SEM). Resultantly it was recognizedthat the wettability characteristics of the membrane surfaces depended on the chemical composition and surface morphology.
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