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DGEBA 에폭시 수지의 열전도도 향상을 위한 촉매형 경화제 2PZ-CN의 활용
여현욱(Hyeonuk Yeo) 한국고분자학회 2020 폴리머 Vol.44 No.5
본 연구는 diglycidyl ether of bisphenol A(DGEBA)계 에폭시 수지의 열전도도 향상을 위한 방안으로 에폭사이드의 음이온성 개환 중합이 가능한 촉매 물질(3-(2-phenyl-1-imidazolyl)propionitrile, 2PZ-CN)을 활용한 경화 시스템에 대한 상세한 정보를 제공한다. 먼저 2PZ-CN의 경화 시스템에 대해 동적 DSC 및 등온 DSC 측정과 분석을 통해 경화 반응의 상세에 대해 조사하였고, 경화물과 복합재료를 제조하여 열전도도를 분석하였다. DGEBA/2PZ-CN의 열전도도는 0.31 W/m·K, DGEBA/2PZ-CN/Al₂O₃(50 wt%)의 열전도도는 1.66W/m·K를 보여, 동일한 조건에서 제조된 범용 에폭시 시료 대비 약 30% 높은 열전도도를 나타냈다. This study provides detailed information on the curing system using a catalytic reagent (3-(2-phenyl-1-imidazolyl) propionitrile, 2PZ-CN), which is capable of anionic ring opening polymerization of epoxide as a way to improve thermal conductivity of diglycidyl ether of bisphenol A (DGEBA) epoxy resin. First, reaction behavior of the curing system of DGEBA/2PZ-CN was investigated through dynamic and isothermal DSC measurements, and thermal conductivity of their cured material and composite materials was investigated. The thermal conductivities of DGEBA/2PZ-CN and DGEBA/2PZ-CN/Al₂O₃(50 wt%) were 0.31W/m·K and 1.66W/m·K, respectively, which were about 30% higher values than the general epoxy specimens manufactured under the same conditions.
신운철,여현욱,권준혁,이관형 대한안전경영과학회 2016 대한안전경영과학회지 Vol.18 No.1
In this study, the current regulations to be adequate in industrial site have to be renew in order to prevent the fatal injuries by mobile cranes. Fatal injury analyses were conducted with several accident cases by the mobile cranes. For each accident, the causes of the injuries were examined and proper safety measures were proposed. This study proposed a revision of the standard guideline as an accident prevention measures through in-depth analysis of fatal accidents. First, fatality rate per 10,000 persons by the mobiles cranes was 0.57 in 2011. Second, the in-depth analysis of the mobile crane accidents showed that the main factors of the accidents were the overturn of mobile crane, the fracture of connection part between mobile crane boom and rope, the breaking of rope and the misunderstanding over the signal between a mobile crane driver and workers around a mobile crane. Third, the order of high defection of connecting parts was bucket bolt, bracket and extension parts. Fourth, since there were several cases of overturn of mobile crane by itself in the in-depth analysis of the mobile crane, the over slop-proof device was proposed as the main alternative in this study. Fifth, the revision of standards of safety factor that shall be more than 10, of connecting parts of mobile crane was proposed.