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- 저자 : 이도남(Do-Nam Lee) (검색결과 4 건)
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광분해 반응에 의한 Phenylsilylene의 생성과 그 반응성에 관한 연구
이도남,신한섭,김장환,이명의,Do Nam Lee,Han Seop Shin,Chang Hwan Kim,Myong Eui Lee 대한화학회 1993 대한화학회지 Vol.37 No.8
Phenylsilylene(PhHSi:)의 광분해 전구체인, 1,1,1,3,3,3-hexamethyl-2-phenyltrisilane(2)과 2,3-dicarbomethoxy-1,4,5,6,7-pentaphenyl-7-silanorbornadiene(5)을 10%와 73%의 수율로 각각 합성하였다. 전구체 2를 254 nm의 빛을 조사시켜 광분해 실험시킨 결과 triethylsilane 존재하에서는 phenylsilylene이 Si-H 결합에 삽입된 생성물인 1,1,1-triethyl-2-phenyldisilane (6)이 44%의 수율로 얻어졌고, diphenylacetylene 존재하에서는 phenylsilylene이 삼중결합에 첨가된 후 diphenylacetylene과 [2+2] 첨가반응이 일어나 얻어진 생성물, 1-phenyl-1-silacyclopenta-2,4-diene(4)과 phenyl-silylene이 삼중결합에 첨가된 다음 곧 이합체화되어진 화합물인 1,2-diphenyl-1,2-disilacyclohexa-2,5-diene(10)이 각각 68% 와 26%의 수율로 얻어졌다. Neat 광반응에서는 생성된 phenylsilylene이 분자간 C-H 삽입반응을 하여 생성된 화합물, 1,5-dihydrosilanthren(11)과 전구체 2가 Si-H 결합에 삽입된 화합물, 1,2-diphenyltrisilane(12)이 5%와 7%의 수율로 각각 얻어졌다. 같은 조건에서 화합물 5를 triethylsilane과 methanol 존재하에서 광분해시킨 결과 phenylsilylene은 생성되지 않고 분자내 1,5-sigmatropic 자리옮김에 의한 silylenolether가 생성됨을 확인하였다. The photochemical precursors, 1,1,1,3,3,3-hexamethyl-2-phenyltrisilane(2) and 2,3-dicarbomethoxy-1,4,5,6,7-pentaphenyl-7-silanorbornadiene(5) were synthesized in the yield of 10% and 73%, respectively. Irradiation of 2 at 254 nm in the presence of triethylsilane gave 1,1,1-triethyl-2-phenyldisilane (6) in 44% yield which was the product of phenylsilylene insertion into the Si-H bond. Irradiation of 2 in the presence of diphenylacetylene gave 1-phenyl-1-silacyclopenta-2,4-diene(4) in 68% yield together with 1,2-diphenyl-1,2-disilacyclohexa-2,5-diene(26%) which were formed from [2+2] addition of the silacyclopropene to diphenylacethylene and formed from dimerization of silacyclopropene, respectively. From the neat photolysis of precursor 2,1,5-dihydrosilanthrene(11), intermolecular C-H insertion product of phenylsilylene and 1,2-diphenyltrisilane(12), Si-H insertion product of phenylsilylene to the precursor were obtained in the yield of 5% and 7%, respectively. In the same experimental condition, both photolyses of 5 in the presence of triethylsilane and methanol showed that the intramolecular 1,5-sigmatropic rearrangement of precursor 5 to give the formation of silylenolether was more favorable process than the generation of phenylsilylene.
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열교환기용 스테인레스강 열화 용접부의 고온 인장 및 피로특성
이상래(Sang-Rae Lee),이기천(Gi-Chun Lee),이도남(Do-Nam Lee),김재훈(Jae-Hoon Kim) 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.1
Purpose: This study aims to determine the most suitable material for heat exchangers by analyzing the tensile and fatigue strengths of different types of stainless steel, i.e., AISI 310S, AISI 316L, and AISI 347 after welding and aging at both room and high temperatures. Methods: Tensile and fatigue tests were performed on three types of stainless steel for heat exchangers using samples aged at 800℃ for 1000 hours and samples that were welded and aged at both room temperature and 800℃. The microstructures of the base material and aged samples were observed using an optical microscope and SEM. The fatigue tests were conducted using a stress ratio of 0.1 and a stress constant test; the fracture surface was then observed using SEM. Results: Chromium carbides tend to precipitate more in aged stainless steel samples than in the base material. It was found that AISI 316L stainless steel has the best elongation and fatigue strength at room temperature and 800℃. Conclusion: In terms of aged and welded samples, AISI 316L stainless steel has the highest elongation and endurance limit. In particular, it has the smallest amount of chromium carbide precipitation at 800℃. In conclusion, it is determined to be an excellent heat exchanger material in terms of weldability, formability, and durability.
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고소작업대 선회대 고정볼트의 하중방향에 따른 피로수명의 영향
최동훈(Dong-Hoon Choi),이도남(Do-Nam Lee),김재훈(Jae-Hoon Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The mobile elevated work platforms (MEWPs) consist of work platform, extending structure, and car, and it is a facility to move persons to working positions. MEWPs are useful but composed complex pieces of equipment, and accidents are caused by equipment defects. Among them, accidents caused by fracture of the bolts fixing the extension structure and the turntable are increasing. In this study, tensile and fatigue tests were performed on M10 high-tensile bolts according to the load direction using an ARCAN fixture. Also, S-N curves are presented with statistical testing method recommended by JSME. Evaluation of fatigue strength was performed by fatigue limit of 1×10<SUP>6</SUP> cycles and reliability assessment analyzed in accordance with survival probability at 1%, 10%, 50%, 90% and 99%.
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N-Silyl-2-Siloxazolidine의 가알콜 분해반응에 관한 연구
김장환,이도남,배동호 연세대학교 자연과학연구소 1991 學術論文集 Vol.25 No.-
2-Siloxazolidine의 유도체 중에서 질소에 trimethysilyl기가 치환된 화합물인, 2, 2-dimethy-3-trimethylsilyl-2-siloxazolidine을 알려진 방법으로 합성하여 i-propyl alcohol과 t-butyl alcohol로 가알콜 분해반응 시켜 alcohol과의 반응성을 연구하여 반응경로를 규명하고자 하였다. 2-Siloxazolidine derivative, 2,2-dimethyl-3-trimethylsilyl-2-siloxazolidine was prepared by vacuum sealed tube thermolysis and was reacted with i-propyl alcohol and t-butyl alcohol. From these studies, we would clarify the mechanism of alcoholysis.
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