PVP Hydrogel Coatings on Polypropylene Fibers using E-beam Irradiation

전자 빔을 이용한 폴리프로필렌 섬유의 PVP 하이드로젤 코팅

Abstract

The surface of hydrophobic polypropylene (PP) fibers (spun-bonded fabric) was treated by an atmospheric plasma treatment method. These pre-treated hydrophilic PP fabrics were dip-coated in the aqueous poly(N-vinyl pyrrolidone) (PVP) solution. PVP layers on the surface of PP fiber were crosslinked by an irradiation of electron beam. The thickness of PVP hydrogels coated on the surface was easily controlled by changing the concentration of PVP in coating solution. The stepwise surface treatment, PVP coating, and hydrogel formation via electron beam irradiation were analyzed by the measurement of contact angle, scanning electron microscopy, and optical microscopy.

소수성 폴리프로필렌 섬유의 표면을 상압 플라즈마 공정을 이용하여 표면처리하였다. 친수성으로 개질된 섬유를 수용성 폴리비닐프롤리돈 (poly(N-vinylpyrrolidone, PVP) 코팅액에 딥코팅하여 PVP 막을 형성하였다. 섬유 표면에 코팅된 PVP 막은 15 kGy 선량의 전자 빔 조사를 통해 가교되어, 폴리프로필렌 섬유의 표면이 PVP 하이드로젤로 균일하게 코팅된 것을 확인하였다. PVP 하이드로젤 코팅막의 두께는 코팅액의 농도를 조절하여 제어할 수 있었다. 단계적인 표면처리, PVP 코팅, 그리고 하이드로젤 막의 형성에 따른 특성은 접촉각, 전자현미경, 광학현미경 등을 통해 분석되었다.

Figure 1. Comparison of contact angle at various surface-treatment time.

Figure 2. SEM micrographs of PP fiber surface: (a) bare, (b) plasma treated, (c) PVP coated on bare PP, (d) PVP coated on plasma treated PP.

Figure 3. SEM micrographs of PVP-coated PP fibers: (a) bare, (b) 0.5 wt(%) PVP solution, (c) 1 wt(%) PVP solution, (d) 2 wt(%) PVP solution, (e) 3 wt(%) PVP solution.

Figure 4. SEM micrographs of (a) bare and (b) PVP hydrogel coated PP fibers.

Figure 5. Thickness changes of PP fiber with various concentrations of PVP solution.

Figure 6. Photographs of water droplet at 80% relative humidity on (a) bare PP after 1h, (b) bare PP after 14 h, (c) PVP hydrogel coated PP after 1h, (d) PVP hydrogel coated PP after 5h, (e) PVP hydrogel coated PP after 24 h.

Figure 7. Optical microscope images of (a) bare PP fiber and (b) PVP hydrogel coated PP fiber.