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윤흥수,Yoon, Heung-Soo,Nagata, Kenji 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.6
Polar amino groups of the waste SS(silk-sericin) and hydroxyl groups of the chitosan were modified by isocyanate compound of MOI[2-(methacryloyloxy)ethyl isocyanate] and MAC(methacryloyl chloride), respectively. When the MOISS(MOI-modified silk sericin)/MACS(MAC-modified chitosan) blend system was pressed with high temper ature, vinyl groups in the MOI or MAC were polymerized and then the flexible and transparent films were obtained. By the polymerization of vinyl groups in the MOISS/MACS blend system, tensile moduli and strengths of the MOISS/MACS blend films exhibited highest level in blend ratio of MOISS/MACS=20/80. The MOISS/MACS blend films exhibited similar solubility to the distilled water $(80^{\circ}C)$ regardless of the MOISS/MACS blend ratios and also higher swell ratios to the distilled water(room temperature) as the MACS contents increased. With increasing MACS content, BOD(biochemical oxygen demand)/TOD(theoretical oxygen demand) decreased.
Diaminotetrabromophenoxycyclotriphosphazene에 의한 에폭시수지의 경화와 열적 성질
윤흥수,최경식,Yoon, Heung-Soo,Choi, Kyung-Shik 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.7
1, 1-diamino-3, 3, 5, 5-tetra-(p-bromophenoxy)cyclotriphosphazene(ABPP) was prepared from hexachlorocyclotriphosphazene and used for the curing agent of a bisphenol A type epoxy resin(EPIKOTE 828). The effect of the curing agent on the dynamic viscoelastic properties and heat resistance of the cured epoxy resins were investigated and compared with those for the epoxy resins cured with 1, 1-diamino-3, 3, 5, 5-tetraphenoxycyclotriphosphazene(APP), 1, 1-diamino-3, 3, 5, 5-tetra-(2, 2, 2-trifluoroethoxy)cyclotriphosphazene(AFEP), 1, 3, 5-trichloro-1, 3, 5-tridimethylaminocyclotriphosphazene(Cl3), 1, 1-diamino-3, 3, 5, 5-tetra-(p-chlorophenoxy) cyclotriphosphazene(ACPP), aliphatic amine and aromatic amine. The epoxy resin cured by ABPP showed the highest storage modulus and glass transition temperature on the curing condition of 19$0^{\circ}C$ for 2 hours. The epoxy resins cured with phosphazene derivatives showed superior flame proofing to those of aliphatic amine and aromatic amine. Particularly limit oxygen index of ABPP showed the highest 31.8~34.5. It is an effective curing agent for epoxy resins to enhance the storage modulus and resistance to heat.
윤흥수,류연승,Yoon, Heung-Soo,Ryu, Yeon-Seung Korea Convergence Society 2019 한국융합학회논문지 Vol.10 No.4
디젤엔진은 열효율이 높고 연비가 좋으며 CO, HC 및 $CO_2$의 배출량이 낮은 등 가솔린 엔진보다 상당한 장점이 있다. 그러나 디젤엔진은 배기가스 중에 $O_2$ 농도가 높기 때문에 NOx 저감이 어렵고, 삼원촉매를 적용하기 어렵다. Urea-SCR과 LNT는 디젤엔진에서 NOx를 연속적으로 저감하는데 활용 가능한 두 기술이다. 디자인 엔진에 Urea-SCR 시스템을 구현함으로써 2.5l 이상 엔진에서 Euro-6의 강화된 NOx 기준을 충족시킬 수 있게 되었다. 본 연구에서는 엔진 회전속도, 부하, 촉매 방식 및 $NH_3$/NOx 비율에 따른 NOx 저감 특성을 연구하여 NOx 저감을 극대화하는 조건을 제시하고자 한다. 또한 Euro-6 이상의 규제에 대응할 수 있도록 Urea-SCR에 대한 정밀한 실험 데이터를 제공하고자 한다. Diesel engines have important advantages over its gasoline counterpart including high thermal efficiency, high fuel economy and low emissions of CO, HC and $CO_2$. However, NOx reducing is more difficult on diesel engines because of the high $O_2$ concentration in the exhaust, marking general three way catalytic converter ineffective. Two method available technologies for continuous NOx reduction onboard diesel engines are Urea-SCR and LNT. The implementation of the Urea-SCR systems in design engines have made it possible for 2.5l and over engines to meet the tightened NOx emission standard of Euro-6. In this study, we investigate the characteristics of NOx reduction with respect to engine speed, load, types of catalyst and the $NH_3$/NOx ratio and present the conditions which maximize NOx reduction. Also we provide detailed experimental data on Urea-SCR which can be used for the preparation for standards beyond Euro-6.
초고분자량 PE와 고밀도 PE 블렌드의 젤 방사에 관한 연구(I) : 블렌드의 열적 성질 Thermal Properties of Blends
尹興洙,崔景植 慶一大學校 1993 論文集 Vol.9 No.1
The thermal properties of Ultra High Molecular Weight Polyethlene and High Density Polyethylene blends were studied to enhance the spinnability of UHMW PE to decrease the viscosity of UHMW PE by additioning HDPE and to enhance the spinnability of UHMW PE. Increasing the content of UHMW PE, the crystallization onset temperature and maximum crystallization temperature of the blends were linearly increased and had the same value above 90% UHMW PE content. Above 50% UHMW PE content, decreasing the content of HDPE, the width of crystallization temperature of the blends were decreased. It is concluded that the crystallization rate of blends was increased by the increase of nucleation level. From the thermal propties of UHMW PE/HDPE it is expected that the physical properties of blends can not be obtained the same level of pure UHMW PE gel above 20% HDPE content.