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수분산 폴리우레탄의 물성에 미치는 Pentaerythritol Triacrylate의 첨가 효과
신용탁 ( Yong Tak Shin ),홍민기 ( Min Gi Hong ),최진주 ( Jin Joo Choi ),이원기 ( Won Ki Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), polycarbonate diol(PCD) and dimethylol propionic acid(DMPA). Subsequently, acrylic terminated prepolymers were prepared by capping the NCO groups of polyurethane prepolymers with different moles of pentaerythritol triacrylate(0~0.024 moles) as a acrylate monomer. The average particle size of the acrylic terminated polyurethane solutions was increased with increasing PETA contents. Also, the prepared coating films showed better abrasion resistance and pencil hardness than pure waterborne polyurethane.
Tetraethylorthosilicate를 사용한 수분산 폴리우레탄/실리카 Nanocomposite의 제조
신용탁 ( Yong Tak Shin ),홍민기 ( Min Gi Hong ),최진주 ( Jin Joo Choi ),이원기 ( Won Ki Lee ),이경배 ( Gyoung Bae Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.4
Pentaerythritol Triacrylate와 실란커플링제의 첨가가 수분산 폴리우레탄의 물성에 미치는 영향
신용탁 ( Yong Tak Shin ),홍민기 ( Min Gi Hong ),김병석 ( Byung Suk Kim ),이원기 ( Won Ki Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Acrylic terminated polyurethane prepolymers were synthesized by capping the NCO groups of polyurethane prepolymers, prepared from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA), with pentaerythritol triacrylate (PETA). Subsequently, silylated acrylic terminated prepolymers were prepared by capping the NCO groups of acrylic terminated polyurethane prepolymers with different types of silane coupling agents, glycidoxypropyl trimethoxysilane (GPTMS) or aminopropyl triethoxysilane (APS). The average particle size of pure waterborne polyurethane solution, measured by the dynamic light scattering method, was increased from 14.3 nm to 208.6 nm by adding PETA and APS. Also, the coating film of silylated acrylic terminated waterborne polyurethane showed better abrasion resistance and pencil hardness than that of pure waterborne polyurethane.
실란커플링제 종류 변화가 수분산 폴리우레탄의 특성에 미치는 영향
신용탁 ( Yong Tak Shin ),황지현 ( Ji Hyeon Hwang ),홍민기 ( Min Gi Hong ),최진주 ( Jin Joo Choi ),이원기 ( Won Ki Lee ),이경배 ( Gyoung Bae Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.3
NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), poly (tetramethylene glycol)(PTMG) and dimethylol propionic acid(DMPA). Subsequently, waterborne polyurethanes were prepared by capping the NCO groups of polyurethane prepolymers with different types of silane coupling agents, such as methyltsimethoxysilane(MTMS), glycidoxypropyl trimethoxysilane(GPTMS), methaeryloxypropyl trimethoxysilane(MPTMS) and aminopropyl triethoxysilane(APS). The avenge particle size of the waterborne polyurethane solutions was increased by adding silane coupling agents. Also, the coating films prepared from GPTMS, MPTMS and APS, exhibited better pencil hardness than those from pure waterbome polyurethane. On the other hand, the coating films from MTMS did not show an improved pencil hardness than those from pure waterbome polyurethane.
아크릴 단량체 종류 변화가 수분산 Polyurethane Dispersion의 물성에 미치는 영향
신용탁 ( Yong Tak Shin ),홍민기 ( Min Gi Hong ),김병석 ( Byung Suk Kim ),이원기 ( Won Ki Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), polycarbonate diol(PCD) and dimethylol propionic acid(DMPA). Subsequently, acrylic terminated polyurethanes were prepared by capping the NCO groups of polyurethane prepolymers with different types of acrylate monomers, such as 2-hydroxyethyl methacrylate(HEMA), 2-hydroxyethyl acrylate(HEA) and pentaerythritol triacrylate(PETA). The average particle sizes of the acrylic terminated polyurethane solutions were increased by capping acrylate monomers. Also, the prepared coating films showed better abrasion resistance and pencil hardness than those of pure waterborne polyurethanes. The coating film with PETA exhibited the best abrasion resistance and pencil hardness of coating films prepared with three acrylate monomers.
Colloidal Silica가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향
신용탁 ( Yong Tak Shin ),이민지 ( Min Ji Lee ),조경숙 ( Kyung Sook Cho ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and γ-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were prepared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.
Colloidal Silica를 이용한 Silylated Waterborne Polyurethane/Silica Nanocomposite의 제조
홍민기 ( Min Gi Hong ),신용탁 ( Yong Tak Shin ),최진주 ( Jin Joo Choi ),이원기 ( Won Ki Lee ),이경배 ( Gyoung Bae Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.5
장우영(Woo-Young Jang),신용탁(Yong-Tak Shin),신동일(Dong-il Shin),신동규(Dong-Kyoo Shin) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
인터넷 사용의 보편화로 사이버 공간이 날로 확장하고 있다. 테이프나 CD로 즐기던 음악을 PC 또는 전용 플레이어를 이용해 MP3파일로 듣기도 하고 ?이 영화관에 가지 않고도 인터넷으로 영화와 비디오를 감상하는 시대가 이미 열렸다. 또한 최근에는 파일형태로 공급되는 전자 북(E-book)이 등장해 종이 책 시장을 넘보고 있다. 그러나, 디지털 컨텐츠들은 쉽고 간편하게 원본과 똑같은 품질로 복제할 수 있을 뿐만 아니라 상상을 초월하는 빠른 속도로 이동이 가능하여 사용자들이 불법으로 얼마든지 이용할 수 있다. 현재 국내외에서 이러한 문제를 해결하기 위해 제안한 기술로 디지털 컨텐츠들을 보호하고 관리할 수 있도록 하는 DRM(Digital Rights Management)이라는 시스템들이 제안되어 계속적으로 개발되고 있다[1]. 디지털 컨텐츠를 보호하고 저작권을 관리하는 시스템인 DRM에는 크게 세 가지의 기본 시스템(Puvlisher Customer, DRM Server System)이 있다. 본 논문에서는 컨텐츠를 등록하고 저작권자가 그 컨텐츠를 관리하는 Publisher System을 키 알고리즘을 이용하여 설계한다.