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TiCl4 가수분해에 의한 titanic acid의 생성에 관한 연구
김헌,김대웅,이경희,백운필,Kim, Hern,Kim, Dae-Woong,Lee, Kyung-Hee,Baik, Woon-Phil 한국결정성장학회 1998 韓國結晶成長學會誌 Vol.8 No.2
$TiCL_4$수용액의 탈수 반응에 있어 pH의 영향에 관하여 연구하였다. KOH와 HCl을 탈수 촉진 및 탈수 지연제로 사용하여 실험한 결과 다음과 같은 결론을 얻었다. $TiCL_4$ 수용액과 KOH와의 반응계에서 중화점은 pH 7.4이었으며 중화점 이전에서는 반응 생성물로 polymetatitanic acid의 중합체인 Ti-gel이 생성되고 중화점 이상에서는 재탈수 반응에 의하여 oligomer화가 일어난다. 또한 결정성 potasium titanate는 존재하지 않는다. The effect of pH on the dehydration reaction of $TiCL_4$ solution. KOH and HC1 were used as a accelerater and retarder in dehydration. Results are follow. Neutralization point is pH 7.4 in the system of $TiCL_4$- KOH and the production which is produced at acidic side is Ti -gel of poly metatitanic acid. The production which is produced at alkalic side is aligomer and crystalline potasium titanate is not detected.
Titanic acid로부터 Anatase형 $TiO_2$의 형성에 관한 연구
김헌,김대웅,이경희,백운필,Kim, Hern,Kim, Dae-Woong,Lee, Kyung-Hee,Baik, Woon-Phil 한국결정성장학회 1999 韓國結晶成長學會誌 Vol.9 No.5
일정농도의 $TiO_2$ 수용액과 일정농도의 KOH 수용액을 반응시켜 $TiO_2$의 가수분해에 의한 Titanium Oxide의 생성 및 생성물의 열처리 조건에 따른 거동을 연구하였다. 열처리 조건은 300~1000$1000^{\circ}C$에서 각각 1시간으로 하였고 각 조건에서 얻어진 생성물의 분석은 XRD, DTA 및 FT-IR에 의하여 연구 검토되었으며 그 결과 다음과 같은 결론을 얻을 수 있었다. \circled1 $90^{\circ}C$의 온도조건에서 초기 가수분해 반응 생성물은 Anatase형 TiO2의 주 peak가 회절각도의 폭이 넓고 강도가 약하게 나타나 준결정질 물질임을 나타내고 있다. \circled2 결정질이 좋지 못한 준정질 산화티탄은 $300^{\circ}C$까지는 Anatase 결정성이 온도와 더불어 좋아지며 $700^{\circ}C$에서 rutile형 TiO2로 상전이 한다. \circled3 alkali pH 영역에서 생성된 K-O-Ti 결합을 형성한 비 결정성 물질은 potasium titanate계의 물질로써 결정화 온도는 630~$640^{\circ}C$ 부근이다. \circled4 비 결정성 K-O-Ti 결합이 공존하는 준결정성 산화티탄은 K-O-Ti 결합물질의 함량이 증가됨에 따라 Anatase로의 결정화 온도가 $300^{\circ}C$에서 50$0^{\circ}C$로 높아지며 또한 rutile형 $TiO_2$로의 상이전도 $700^{\circ}C$에서 $900^{\circ}C$로 높아진다. \circled5 $TiO_4$와 KOH를 사용한 습식법에 의한 Anatase형 $TiO_2$합성조건은 pH 3~pH 5가 가장 바람직하며 열처리 온도는 $300^{\circ}C$에서 가능하다. Synthesize of anatase type $TiO_2$ from $TiCl_4$ solution was studied. KOH was used on dehydration reaction of $TiCl_4$ solution. Products of dehydration reaction was calcined at 300, 500, 700, 900, $1000^{\circ}C$ during 1hour. Calcined products was studied by XRD, DTA, and FT-IR for effect of calcined temperature. The results are as follow. \circled1 Product pf dehydration reaction at$ 90^{\circ}C$ was semicrystalline anatase type $TiO_2$ because it has a peak vary broad and low at the position of anatase crysral XRD pattern. \circled2 Pure titanium oxide semi-crystalline products were produced at acid pH condition which convert to anatase crystal at $300^{\circ}C$ and to rutile crystal at $700^{\circ}C$. \circled3 The chemical composition of semicrystalline products which was produce at alkali pH conditions, were potasium titante. Potasium-titanate semi-crystalline products crystallized at 630~$640^{\circ}C$ \circled4 The transition temperature of potassium dopped titanium oxide semi-crystalline products was increased with the contents of potasium. \circled5 The optimum synthesise condition of anatase $TiO_2$ products from $TiCl_4$ and KOH are pH 3~5 and $300^{\circ}C$ calcination.
Caprolactone기 함유 아크릴수지와 HDI-Trimer에 의한 하이솔리드 도료의 도막물성
조혜진 ( Hye Jin Jo ),심일우 ( Il Woo Shim ),유혁재 ( Hyuk Jae You ),우종표 ( Jong Pyo Wu ),김명수 ( Myung Soo Kim ),함현식 ( Hyun Sik Hahm ),박홍수 ( Hong Soo Park ),백운필 ( Woon Phil Baik ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A High-solid coatings were prepared by blending of previosly synthesized acrylic resins and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The impact resistance, cross-hatch adhesion, 60° specular gloss, and heat resistance of the films proved to be good, and the pencil hardness and drying time proved to be slightly poor. Especially, there was a remarkable improvement in the heat resistance. This improvement may stem from the regular arrangement of ethyl groups introduced into the acrylic resin. As a result of Rigid-body pendulum visco-elasticity measurement, dynamic T_g values of cured films increased with dynamic T_g values.
다단계 유화중합을 이용한 마이크론 크기의 PMMA/PDVB 및 PS/PDVB 단분산 입자의 제조
최봉철 ( Bong Cheol Choi ),엄기범 ( Ki Beom Um ),변자훈 ( Ja Hoon Byun ),박홍수 ( Hong Soo Park ),우종표 ( Jong Pyo Wu ),백운필 ( Woon Phil Baik ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A Highly crosslinked micron-size monodispersed PMMA/PDVB and PS/PDVB particles were prepared using seeded multi-stage emulsion polymerization. PMMA and PS seed particles were synthesized by seeded multi-stage emulsion polymerization and soap-free emulsion polymerization. Then PMMA/PDVB and PS/PDVB particles were obtained using semi-batch type emulsion polymerized using divinyl benzene as a cross-linkable monomer in the presence of seed particles. PMMA particles with size of ai. 730 ㎚ and polydispersity of 1.03 were successfully prepared in this experiment. PS particles with size of ca. 1.5 ㎛ and polydispersity of 1.01 were prepared in this experiment. Highly crosslinked PS/PDVB particles with size of ca 1.3 ㎛ and polydispersity of 1.00 were obtained.
심일우 ( Il Woo Shim ),조혜진 ( Hye Jin Jo ),유혁재 ( Hyuk Jae You ),우종표 ( Jong Pyo Wu ),김명수 ( Myung Soo Kim ),함현식 ( Hyun Sik Hahm ),박홍수 ( Hong Soo Park ),백운필 ( Woon Phil Baik ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A An acid cleaning agent (AACA) for aluminum was prepared by blending of sorbitol, n-octanoic acid, MJU-100A, Tetronix T-701, PPA-23, CS-83 and phosphoric acid. With the prepared AACA, degreasing, foam height, etching and derusting tests were carried out. As a result, AACA-4 and AACA-7 showed better cleaning ability than commercial acid cleaning agents.