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Poly(perfluoroalkyl acrylate)/Silica 나노복합체의 표면이행성 연구
범정철,하종욱,이광원,박인준,소원욱,이수복 한국공업화학회 2003 응용화학 Vol.7 No.2
Surface migration of Poly(perfluoroalkylethyl acrylate)(PFA)/silica nanocomposites added in poly(methylmethacrylate()(PMMA) was investigated by comparing before and after annealing. In this study, surface migration characterizations of PFA/silica composites were measured by SEM(Scanning Electron Microscopy) and contact angle measurement. Their surface free energies were calculated with contact angle data by geometric mean approximation. The contact angles were increased and the surface free energies were decreased, according to increasing the graft density of nanocomposites and decreasing the concentration of PMMA, respectively. It was confirmed that PFA/silica nanocomposites were successfully migrated toward the surface of the PMMA film.
PFA / Silica 유-무기 복합체의 제조 및 표면특성
범정철,하종욱,박인준,이수복 한국공업화학회 2003 응용화학 Vol.7 No.1
Poly(perfluoroalkyl acrylate)(PFA) / silica composites having different silica size were prepared by surface polymerization. In this study, surface characterizations of PFA/silica composites were done by HR-TEM(High Resolution Transmission Microscopy), contact angle measurement, sliding angle measurement, surface roughness measurement, and the relationships between the sliding angle and the contact angle were investigated. In the highly hydrophobic region, the sliding angles of water droplets decreased with increasing contact angle. Their surface free energies were calculated with contact angle data by geometric mean approximation. The composites with super water repellent and sliding could be obtained with contact angle of above 150。and sliding angle of below 10。to water droplets. The ultimate value of surface free energies of the composites reached below ca. ldyn/cm.
범정철,정대환,하종욱,박인준,이수복 한국공업화학회 2002 응용화학 Vol.6 No.1
The super water-repellent composite membrane were obtained using "grafting-from" polymerization with azo initiator chemically bonded on porous silica surface and radical-chain polymerization of fluorinated monomer. The synthesis of the fluorinated polymer brushes, membrane characterization were measured by XPS(X-ray Photoelectron Spectroscopy), SEM(Scanning Electron Microscopy), contact angle measurement, and permeation test. A liquid droplet on the ultra-hydrophobic surface has a contact angle as large as 160˚ with apparent surface free energy of ca. 0.1 dyn/cm. The first application of the surface to 4th generation composite membrane is also described. Permeability measurement was performing simple time-mass measurements using water and MeOH. The permeability of the membrane was changed remarkably by the surface modification with PFA brushes.
표면중합을 이용한 초발수 복합입자의 제조 및 표면특성 : 중합시간의 영향 The Effect of Polymerization Time
범정철,하종욱,박인준,김정훈,이수복,ShiYuan, Cheng 한국공업화학회 2003 응용화학 Vol.7 No.2
This study investigates the preparation of poly(perfluoroalkyl acrylate)[PTA]/silica composite particles by surface polymerization and their characteristics according to surface polymerization time. The particles were prepared by "grafting-from" technique by immobilizing self-assembled initiator and surface radical polymerization from silica particle surface. Characterization was done by contact angle and sliding angle measurements, surface roughness measurement and surface free energy estimation Contact angle were inversely proportion to sliding angle. Graft density(GD) and contact angle of composites increased according to polymerization time. On the other hand, surface free energy and sliding angle were decreased according to increment of polymerization time.
범정철,하종욱,박인준,이수복 한국공업화학회 2002 응용화학 Vol.6 No.2
The durable super water and oil repellent composite particles were obtained by "grafting-from" polymerization with azo initiator chemically bonded on silica surface and surface radical-chain polymerization of fluorinated monomer. The synthesis of attached layers and the characterization by XPS(X-ray Photoelectron Spectroscopy), SEM(Scanning Electron Microscopy), contact angle measurement, and test of dispersion in water are described. In order to obtain quantitative information about the graft densities of the covalently attached polymer monolayer, the particles were investigated by TGA(Thermogravimetric Analysis). Contact angle data informed that the composite particles with super water and oil repellent properties could be obtained with contact angle of more than 150. and 130. according to water and methylene iodide, respectively.
범정철,하종욱,박인준,이수복,정대환 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
The super water-repellent composite membrane were obtained using 'grafting-from1 polymerization with azo initiator chemically bonded on porous silica surface and radical-cnain polymerization of fluorinated monomer. The synthesis of the fluorinated polymer brushes, membrane characterization were measured by XPS(X-ray Photoelectron Spectroscopy), SEM(Scanning Electron Microscopy), contact angle measurement, and permeation test. A liquid droplet on the ultra-hydrophobic surface has a contact angle as large as 160° with apparent surface free energy of ca. 0.1 dyn/cm. The first application of the surface to 4th generation composite membrane is also described. Permeability measurement was performing simple time―mass measurements using water and MeOH. The permeability of the membrane was changed remarkably by the surface modification with PFA brushes.