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아크릴 단량체 종류 변화가 대전방지용 수분산 아크릴 폴리우레탄의 물성에 미치는 영향
허우영 ( Woo Young Huh ),윤동구 ( Dong Gu Yun ),송기창 ( Ki Chang Song ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.4
Waterborne polyurethane dispersion (WPUD) was prepared from polycarbonate diol (PCD), isophorone diisocyanate (IPDI) and dimethylol propionic acid (DMPA) as starting materials. Then, waterborne acrylic polyurethane dispersion (AUD) was synthesized by reacting the WPUD with different types of acrylate monomers, such as methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA) and butyl acrylate (BA). Subsequently, the AUD was mixed with multi-walled carbon nanotube (MWCNT) to yield a conductive coating solution, and the mixture was coated on the polycarbonate substrate. The pencil hardness, abrasion resistance and chemical resistance of the coating films from AUD were improved than those from WPUD, while the electrical conductivity of the coating films from AUD was decreased than that of WPUD. Also, the effect of acrylate types on the properties of coating films was investigated. The AUD obtained from HEMA showed the strongest pencil hardness, while the AUD obtained from MMA exhibited the strongest abrasion resistance, chemical resistance and electrical conductivity among several types of acrylate monomers.
균일침전법으로 제조된 란탄이 혼입된 $BaTiO_3$의 전기적 특성
허우영,류경열,김승원,이철,Huh, Woo-Young,Ryu, Kyoung-Youl,Kim, Seung-Won,Lee, Chul 한국결정성장학회 1999 韓國結晶成長學會誌 Vol.9 No.5
La가 혼입된 $BaTiO_3$를 균일침전법으로 제조하여 La의 혼입량 및 입자의 크기 변화에 따른 전기적 특성을 관찰하였다. 온도변화에 따른 저항을 측정한 결과 란탄의 농도가 0.6 mol%일 때 그리고 입자의 크기가 1.0 $\mu\textrm{m}$으로 작을 때 가장 큰 PTCR 효과를 나타내었다. 상전이온도($(T_c)$) 이상에서 온도와 1/$\varepsilon_m$(T)의 관계를 나타낸 도시에 의하면 유전상수의 변화가 Curie-weiss 법칙에 잘 다름을 알 수 있었다. 측정한 비저항과 유전상수로부터 계산한 전위장벽의 높이도 란탄의 농도가 0.6 mol%일 때 입자의 크기가 1.0$\mu\textrm{m}$으로 작을 때 가장 큰 전위장벽을 나타내었다. La-doped $BaTiO_3$ ceramics were prepared from BaTiO(C_2O_4)_2\;{\cdot}\;XH_2O(BTO)$, which was synthesized by homogeneous precipitation using dimethyl oxalate. The electrical properties of La-doped $BaTiO_3$ were investigated with variation of La-contents and particle size. It was found that a large PTCR (positive temperature coefficient of resistivity) effect was appeared in the conditions at the 0.6 mol% of La-content and at small particle size of BTO as 1.0$\mu\textrm{m}$. The plot of temperature vs. 1/$\varepsilon_m$(T) above Curie temperature $(T_c)$ was agreed with Curie-Weiss law. The potential barrier calculated from measured resistance and capacitance of specimen, also gave higher value at small particle size of BTO as 1.0 $\mu\textrm{m}$ and at La-content of 0.6 mol%.
수분산 아크릴 폴리우레탄과 탄소나노튜브의 혼합에 의한 전도성 코팅용액 제조
송기창 ( Ki Chang Song ),허우영 ( Woo Young Huh ),윤동구 ( Dong Gu Yun ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
Waterborne polyurethane dispersion (WPUD) was synthesized from polycarbonate diol (PCD), isophorone diisocyanate (IPDI) and dimethylol propionic acid (DMPA) as starting materials. Then, waterborne acrylic polyurethane dispersion (AUD) was synthesized by reacting the WPUD with an acrylate monomer, methyl methacrylate (MMA). Subsequently, the AUD was mixed with multi-walled carbon nanotube (MWCNT) to yield a conductive coating solution, and the mixture was coated on the polycarbonate substrate. With increasing the amount of MMA in the AUD, the pencil hardness, abrasion resistance and chemical resistance of the coating films were improved, but the electrical conductivity of the coating films was decreased. On the other hand, the pencil hardness, abrasion resistance and chemical resistance of coating films were decreased, but the electrical conductivity was enhanced with increasing the amount of MWCNT in the conductive coating solutions.
Aniline Terminated Waterborne Polyurethane과 PEDOT/PSS의 블렌딩에 의한 대전방지 코팅용액의 제조
홍민기 ( Min Gi Hong ),허우영 ( Woo Young Huh ),변태강 ( Tae Gang Byun ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Polyurethane prepolymers were prepared from poly (carbonate diol), isophrone diisocyanate and dimethylol propionic acid. Then, aniline terminated waterborne polyurethane dispersion (ATPUD) was synthesized by capping the NCO group of the prepolymer with aniline monomer. Subsequently, ATPUD and waterborne polyurethane dispersion (PUD), respectively, were blended with conducting polymer, poly (3,4-ethylenedioxythiophene)/polystyrene sulfonate [PEDOT/PSS], to yield antistatic coating solutions, and the mixture was coated on the polycarbonate substrates. At adequate addition amounts of PEDOT/PSS less than or equal to 2.5 g, the surface resistances (1.0×1011~2.5×108 Ω/ cm2) of coating films from ATPUD showed better electronic conductivities than those (5.0×1011~6.3×109 Ω/cm2) from PUD. However, at excess amount of PEDOT/PSS of 3.0 g, the surface resistance from ATPUD showed similar electronic conductivity with that from PUD.
강형태(Hyung tae Kang),정광용(Gwang ryong Chung),허우영(Woo young Huh),김성배(Seong bae Kim),조남철(Nam chul Cho) 한국상고사학회 2004 한국상고사학보 Vol.45 No.-
전북 익산 왕궁리유적에서 9점의 녹색 유리 편을 입수하였고 과학 분석을 통하여 이를 특성화하였다. 각 시료로부터 각 5종의 산화물을 분석한 결과 모두 납유리(PbO-SiO₂) 계통임을 알 수 있었는데 납의 함량은 71~74% 범위에, 실리카는 26~29% 범위이었다. 납유리의 비중은 대략 4.4~5.8 범위이며 용해온도는 670℃ 부근으로 추정되었다. 유리가 녹색을 띠는 것은 불순물로서 철과 구리 산화물에 의한 것이다. 납유리 제조에 사용한 납 원료의 산지추정을 위해 납동위원소비를 측정한 결과 경기도 부평지역 광산이 유력시된다. 또한 왕궁리유적 납유리와 인근 미륵사지 납유리를 비교한 결과 유리의 색깔, 성분조성, 비중 및 납동위원소비 등이 모두 일치한다는 것을 알 수 있었다. 이는 왕궁리와 미륵사는 납유리 제조에 필요한 원료의 입수장소 및 제조공정 기술을 함께 공유하였음을 의미한다. Characteristics of lead glass from Wanggung-ni : Nine glass pieces of Wanggung-ni were analyzed for five oxides and found that all was lead glass system(PbO-SiO2) with the range of 71~74% for PbO and 26~29% for SiO2. The concentrations of oxides such as A12O3, Fe203 and CuO were all below 0.4%. Most of lead glasses were greenish by the efficacy of iron and copper oxides and some showed yellowish-green. The gravity of lead glasses was about 4.4~5.8 and estimated melting point was near 670. Lead isotope ratios of glasses were analyzed and found quite close to a lead ore from the Bupyeong mine in Gyeonggi-do. Comparison with lead glasses of Mireuksa Temple : Lead glasses of Wanggung-ni were compared with those of Mireuksa Temple on the basis of chemical and physical data. Chemical compositions, density and melting temperature of lead glasses of Wanggung-ni were nearly similar with those of Mireuksa Temple. And lead isotope ratios of those were also according with each other. These results have shown that they hold the same raw materials and technology for glass making in common and so, maintained close relations with each other.