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에폭시/마이크로실리카/나노실리카 혼합 콤포지트의 열적, 전기적 특성
강근배,권순석,박재준,Kang, Geun-Bae,Kwon, Soon-Seok,Park, Jae-Jun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
The epoxy/micro-and nano-mixed silica composites(EMNC) systems were prepared and the AC insulation breakdown strength was evaluated. Glass transition temperature (Tg) and crosslink density were also measured by dynamic mechanical analyzer(DMA) in order to correlate them with the electrical and mechanical properties, and the effect of silane coupling agent on the electrical properties was also studied. Electrical properties and crosslink density of epoxy/micro-silica composite were noticeably improved by addition of nano-silica and silane coupling agent, and the highest breakdown strength was obtained by addition of 0.5~5 phr of nano-silica and 2.5 phr of silane coupling agent, and the highest tensile and flexural strength were obtained by addition of 2.5 phr of nano-silica.
이재영,박재준,김재설,신성식,윤찬영,정종훈,김영우,강근배 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.2
The cure kinetics of a neat epoxy system and epoxy/silica composite were investigated by DSC analysis. Acycloaliphatic type epoxy resin was diglycidyl 1,2-cyclohexanedicarboxylate and curing agent was anhydride type. To estimate kinetic parameters, the Kissinger equation was used. The activation energy of the neat epoxy system was88.9 kJ/mol and pre-exponential factor was 2.64×1012 min-1, while the activation energy and pre-exponential factor forepoxy/silica composite were 97.4 kJ/mol and 9.21×1012 min-1, respectively. These values showed that the silica particleshave effects on the cure kinetics of the neat epoxy matrix.
박재준,김재설,윤찬영,신성식,이재영,정종훈,김영우,강근배 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.2
Mechanical and electrical properties of epoxy/silica microcomposites were investigated. The cycloaliphatic- typeepoxy resin was diglycidyl 1,2-cyclohexanedicarboxylate and the curing agent was of an anhydride type. To measurethe glass transition temperature (Tg), dynamic differential scanning calorimetry (DSC) analysis was carried out, andtensile and flexural tests were performed using a universal testing machine (UTM). Electrical breakdown strength, themost important property for electrical insulation materials, and insulation breakdown strength were also tested. Themicrocomposite with 60 wt% microsilica showed maximum values in mechanical and electrical properties.