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Reactions of Trimethylsilyldiphenylphosphine with Isocyanates
한송윤,민태진,이동율,이일규,Song Yoon Han,Tae Jin Min,Dong Yul Lee,Il Kyu Lee Korean Chemical Society 1971 대한화학회지 Vol.15 No.6
Reactions of trimethylsilyldiphenylphosphine with phenylisocyanate and ethylisocyanate were studied at various temperatures for 3 days. Trimethylsilyldiphenylphosphine gave cyclic dimer, cyclic trimer and diphenylcarbodiimide from phenylisocyanate, but gave cyclic trimer, triethylisocyanurate, only from ethylisocyanate. In these reactions, it is suggested that trimethylsilyldiphenylphosphine was used to be an effective catalyst for cyclization of isocyanates.
Organosilyl 및 Organostannyl-Sulfide와 Isocyanate의 반응
한송윤,이동율,이일규,백우현,Song Yoon Hahn,Dong Yul Lee,Il Kyu Lee,Paek U Hyon 대한화학회 1973 대한화학회지 Vol.17 No.3
Trimethylsilylethylsulfide, trimethylsilylphenylsulfide, triethylstannylethylsulfide 그리고 triethylstannylphenysulfide를 10일간 여러온도에서 isocyanate와 각각 반응시켰다. 이들 Si-S와 Sn-S결합 유기금속화합물들은 phenylisocyanate의 이량체, 삼량체, diphenylcarbodiimide 및 1,3,5-triphenyl-4-phenyliminohexahydro-1,3,5-triazine-2,6-dione의 생성 촉매로 작용하였다. 반면 이 화합물들은 ethylisocyanate로부터는 삼량체인 triethylisocyanurate만을 생성하였다. Reactions of trimethylsilylethylsulfide, trimethylsilylphenylsulfide, triethylstannylethylsulfide, and triethylstannylphenylsulfide with isocyanates were studied at various temperatures for 10 days. These Si-S and Sn-S bond compounds catalyzed the production of the cyclic dimer and trimer of phenylisocyanate, diphenylcarbodiimide and 1,3,5-triphenyl-4-phenyliminohexahydro-1,3,5-triazine-2,6-dione in the reaction of phenylisocyanate. In contrast, these compounds gave only the cyclic trimer, triethylisocyanurate, from ethylisocyanate.
Triethylstannyldiphenylphosphine과 Phenylisocyanate의 반응
백우현,한송윤,이동율 동국대학교 대학원 1973 大學院硏究論集-東國大學校 大學院 Vol.3 No.-
triethylstannyldiphenylphosphine과 phenylisocyanate를 ampoule 속에서 1:10 몰비로 하여 여러 온도로 나누어 반응시켰다. 이들 반응에서 diphenylcarbodiimide 는 놀랍게도 저온 반응에서 phenylisocyanate 의 2량체인 N, N-diphenyluretidine-2,4-dione 과 함께 생성되었고, 고온 반응에서는 1,3,5-triphenyl-4-phenyliminohexahydro-1,3,5-triazine-2,6-dione 이 carbodiimide와 3량체인 triphenylisocyanurate과 함께 생성 되었다. 그러나 실은 반응에서 는 3량체만을 얻을 수 있었다. triethylstannyldiphenylphosphine은 모든 반응에서 상기 반응생성물의 생성촉매로 적용되었다. Reactions of triethylstannyldi phenylphosphine with phenylisocyanate were carried out at various temperatures in ampoules. In these reactions diphenylcarbodiimide surprisingly yielded with N,N-diphenyluretidine-2,4-dione, cyclic dimer of pheny-lisocyanate at low reaction temperature and 1,3,5-tripheny1-4-phenyliminohexahydro-1,3,5-triazine-2.6-dione with carbodiimide and cyclic trimer triphenylisocyanurate at high condition. But at room temperature, we got only phenylisocyanurate. Triethylstannyldiphenylphosphine was used a catalyst for the formation of the above compounds.
5-BROMO-2-THIOURACIL의 新合成法에 對한 硏究
李東律,韓松潤 동국대학교 대학원 1972 大學院硏究論集-東國大學校 大學院 Vol.1 No.-
A study for New Synthesis of 5-Bromo-2-Thiouracil. Diazotization of 5-amino Substituted 2-thiouracil and 6-methyl-2-thiouracil were Carried out and the Sandmeyer bromination was tried on the diazotized 5-amino-2-thiouracil. The yield of diazotized Compounds was 75∼86% of theoretical amount. Diazotized 5-amino thiouracil gave 5-Bromo thiouracil on Sandmeyer reaction with poor yield. The melting point of the product matched well with the 5-bromo uracil prepared by direct bromination of 2-thiouracil.
적층제조된 알루미늄 합금의 공정변수 및 합금조성이 상대밀도와 기계적 특성에 미치는 영향도 분석
박수원,여지윤,한송윤,최현주 한국분말재료학회 2023 한국분말재료학회지 (KPMI) Vol.30 No.3
Metal additive manufacturing (AM) has transformed conventional manufacturing processes by offering unprecedented opportunities for design innovation, reduced lead times, and cost-effective production. Aluminum alloy, a material used in metal 3D printing, is a representative lightweight structural material known for its high specific strength and corrosion resistance. Consequently, there is an increasing demand for 3D printed aluminum alloy components across industries, including aerospace, transportation, and consumer goods. To meet this demand, research on alloys and process conditions that satisfy the specific requirement of each industry is necessary. However, 3D printing processes exhibit different behaviors of alloy elements owing to rapid thermal dynamics, making it challenging to predict the microstructure and properties. In this study, we gathered published data on the relationship between alloy composition, processing conditions, and properties. Furthermore, we conducted a sensitivity analysis on the effects of the process variables on the density and hardness of aluminum alloys used in additive manufacturing.
Multi-feeder 3차원 적층제조 기반 조합실험을 활용한 알루미늄 합금탐색
박수원,송용욱,여지윤,한송윤,최현주 한국분말재료학회 2023 한국분말재료학회지 (KPMI) Vol.30 No.3
Aluminum alloys are widely utilized in diverse industries, such as automobiles, aerospace, and architecture, owing to their high specific strength and resistance to oxidation. However, to meet the increasing demands of the industry, it is necessary to design new aluminum alloys with excellent properties. Thus, a new method is required to efficiently test additively manufactured aluminum alloys with various compositions within a short period during the alloy design process. In this study, a combinatory approach using a direct energy deposition system for metal 3D printing process with a dual feeder was employed. Two types of aluminum alloy powders, namely Al6061 and Al-12Cu, were utilized for the combinatory test conducted through 3D printing. Twelve types of Al-Si-Cu-Mg alloys were manufactured during this combinatory test, and the relationship between their microstructures and properties was investigated.