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금속 프탈로시아닌 유도체 합성에 의한 촉매기능성 소취제의 제조
조동련,최창남,김현진,김애경 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.12
Metal phthalocyanine derivatives, Fe(III)-TCMP and Cu(I)-TCMP, were synthesized to investigate their potential use as catalytic deodorants. Their chemical structures were characterized by FT-IR and AA spectroscopy, and catalytic activities were evaluated in terms of decomposition yield of hydrogen peroxide. Although both of them had sufficient activities for a catalytic deodorant, Fe(III)-TCMP showed better result than Cu(I)-TCMP. Percentage of deodorization of Fe(III)-TCMP was investigated by measuring the rate of oxidation of 2-mercaptoethanol, a representative index material for bad smelling compounds. The percentage was dependent on the concentration of Fe(III)-TCMP and reaction temperature. It increased as concentration and temperature increased. However, the percentage was high even at low concentration and low temperature. More than 95% of 2-mercaptoethanol could be removed within 30 minutes with 2% of Fe(III)-TCMP at 2$0^{\circ}C$.
Production of pure hydrogen from methane by low temperature plasma processing
조동련,Hae-Na Kim,Minguen Lee,Eun-Kyung Choi 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.12
Production of pure hydrogen from methane by a low temperature plasma process coupled with catalytic reaction was investigated. In low temperature plasma, methane molecules were converted to thin solid films and hydrogen. The conversion of methane and the hydrogen yield depended on the flow rate of methane and the discharge power for the low temperature plasma process. They increased as the flow rate decreased and the discharge power increased. A conversion as high as 87.4% and hydrogen yield as high as 67% could be obtained, but the purity of the hydrogen was less than 90%. The purity could be increased to 100% by coupling the low temperature plasma process with a catalytic reaction using a plasma-catalyst hybrid system.
조동련(D . L . Cho),이영득(Y . D . Lee) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.4
N/A Surface modification of silicone rubber by low temperature plasma process was investigated to improve quality of silicone EVD tube by reducing tackiness and hydrophobicity. Treatment with nonpolymer-forming plasmas and thin film deposition with polymer-forming plasmas were tried. Tackiness could significantly be reduced, especially by thin film deposition. As a result, the tube became slippery and less vulnerable to contamination in laboratory environment. Inner as well as outer surface of the tube could be changed to be hydrophilic if the plasma contained oxygen. As a result, initial hydrodynamic resistance was reduced. The surface modification did not give any bad influence on mechanical properties of the silicone tube in most cases. Rather, some properties such as Young`s modulus, ultimate tensile strength and elongation at break were improved.
프로필렌의 플라즈마 처리로 개질된 목분이 복합재료의 기계적 특성에 미치는 영향
조동련 ( Dong Lyun Cho ),하종록 ( Jong-rok Ha ),김병선 ( Byung Sun Kim ),이진우 ( Jin Woo Yi ) 한국복합재료학회 2017 Composites research Vol.30 No.2
프로필렌의 플라즈마 처리로 목분을 표면 개질하여 복합재 기지인 PP와 상용성을 가지게 하였다. 프로필렌을 플라즈마로 처리하여 증착된 소수성 박막 필름의 화학적 구조는 PP와 흡사하였다. 목분과 PP는 이축 압출기에 의해 펠렛으로 만들어 졌고 50 wt% wood powder/PP 복합재료는 사출 성형기에 의해 성형되었다. 인장강도와 굴곡 강도는 최고 7.59% and 12.43%까지 향상되었으며 파단면에 대한 SEM 관찰로 플라즈마 중합이 계면 접착력과 기계적 특성을 향상시킨 것을 볼 수 있었다. Wood powders were surface-modified by plasma-treating propylene to make them compatible with PP matrix in WPC(wood powder composite). The plasma treatment of propylene resulted in the deposition of an ultrathin hydrophobic film which had the chemical structure similar to that of polypropylene. Wood powder and polypropylene were mixed to pellets by twin screw extruder and then 50 wt% wood powder/PP composites were produced by an injection machine. Tensile strength and flexural strength were improved by 7.59% and 12.43% at the maximum respectively. SEM (Scanning Electron Microscopy) observation on the fracture surface revealed that the treatment improved the interfacial bonding and the mechanical properties of the composites.