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서은덕 慶南大學校 附設 工業技術硏究所 1990 硏究論文集 Vol.8 No.-
길고 가는 튜브형 반응기를 사용하여 Perfluoropropene(PFP)를 Polyethylene(PE) 기질에 플라즈마중합 하였다. 방전출력을 달리 했을때 PE 표면에 석출된 중합박막의 화학적 조성을 조사하기 위하여 ESCA 스펙트럼이 이용되었다. 방전출력이 증가함에 따라서 CF₂기와 CF₃기가 증가하였으며 Teflon-like한 표면을 얻을 수 있었다. 비발광지역에서 방전출력이 충분히 낮을 때 중합반응기구는 주로 부가반응에 의해서 진행되어지는 것으로 생각되며 발광지역에서는 원자중합개념으로 해석 되었다. 중합박막의 두께도 방전출력의 영향을 받는데 방전출력이 증가함에 따라서 환산 두께가 점차 감소하였으며 삭마반응이 심하게 됨을 알 수 있었다. Perfluoropropene(PFP) was plasma-polymerized on polyethylene(PE) substrate using long and slender tubular reactor. ESCA spectra were used to characterize the surface of PE exposed to PFP plasma at different discharge powers. With increasing discharge power, the intensities of CF₂and CF₃group increased and Teflon-like coatings could be obtained. At sufficiently low discharge power in nonglow region, the plasma polymerization was considered to proceed via addition reaction. In glow region, however, it was considered to proceed via atomic polymerization concept. The thickness of PFP plasma polymer was affected by discharge power. With increasing discharge power, the reduced thickness of coating decreased gradually and ablation reaction became severe.
고분자의 플라즈마처리에 의한 산성기를 갖는 단량체의 고정화 1. Polyethylene 표면상의 아크릴산 고정화
서은덕 경남대학교 공업기술연구소 2000 硏究論文集 Vol.18 No.-
고분자의 표면물성을 친수성으로 개질하기 위해서 알곤플라즈마를 이용하여 polyethylene(PE)표면에 아크릴산을 고정시켰다. 고정화에 의한 개질효과를 FMIR 스펙트럼의 분석과 접촉각측정으로 확인하였다. 개질된 PE표면은 polyacrylic acid의 특성흡수띠를 1710, 1100-1300 및 800cm□□에서 나타내었다. 아크릴 산에 의해서 고정화된 시료의 접촉각은 무처리시료에 비해서 현저하게 감소하였으며 대체로 처리시간이 길수록 친수성을 나타내었다. For the surface modification of polymers with hydrophilic functional groups, acrylic acid is immobilized on the surface of polyethylene(PE) by cold plasma treatment using Ar gas. The immobilization is identified by analysis of frustrated multiple internal reflection(FMIR) spectrum and by the measurement of contact angles for the modified surfaces. Experimental results show that spectra originated from acrylic acid-modified surfaces show characteristic absorption bands of polyacrylic acid at about 1710, 1100-1300, and 800cm□□. Significant decreases in contact angle are observed for the surfaces which are immobilized by acrylic acid compared to virgin PE. The degree of the surface modification and hydrophilicity depends strongly on the plasma-treating time ; prolonged exposure to plasma exhibits more hydrophilic characterisitcs.
서은덕 한국고분자학회 2004 Macromolecular Research Vol.12 No.6
Isotactic polypropylene (PP) surfaces were modified with argon and oxygen plasmas using a radio-frequency (RF) glow discharge at 240 mTorr and 40 W. The changes in topography and surface structure were investigated by atomic force microscopy (AFM) in conjunction with specular reflectance of infrared (IR) microspectroscopy. Under our operating conditions, the AFM image analysis revealed that longer plasma treatment resulted in significant ablation on the PP surface, regardless of the kind of plasma employed, but the topography was dependent on the nature of the gases. Specular reflectance IR spectroscopic analysis indicated that the constant removal of surface material was an important ablative aspect when using either plasma, but the nature of the ablative behavior and the resultant aging effects were clearly dependent on the choice of plasma. The use of argon plasma resulted in a negligible aging effect; in contrast, the use of oxygen plasma caused a noticeable aging effect, which was due to reactions of trapped or isolated radicals with oxygen in air, and was partly responsible for the increased surface area caused by ablation. The use of oxygen plasma is believed to be an advantageous approach to modifying polymeric materials with functionalized surfaces, e.g., for surface grafting of unsaturated monomers and incorporating oxygen-containing groups onto PP.