Polymer(Korea), Vol.37, No.1, 47-51, January, 2013
알루미나 나노섬유와 분말이 첨가된 에폭시 복합재료의 열전도도 특성 및 파괴인성에 대한 연구
A Study on Thermal Conductivity and Fracture Toughness of Alumina Nanofibers and Powders-filled Epoxy Matrix Composites
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초록
본 연구에서는 알루미나 나노섬유의 함량을 20에서 100 phr까지 달리하여 알루미나 나노섬유와 분말이 첨가된 에폭시 복합재료의 열전도도 및 파괴인성에 미치는 영향에 대해서 살펴보았다. 열전도도는 열전도도분석기로 측정하였고, 파괴인성은 임계응력세기인자(KIC) 측정을 통하여 고찰하였다. 모폴로지는 주사전자현미경(SEM)으로 관찰하였다. 실험결과, 알루미나 나노섬유의 함량이 증가함에 따라 열전도도가 향상됨을 확인할 수 있었으며, 알루미나 나노섬유의 함량이 열전도도를 결정하는 중요한 요소임을 알 수 있었다. KIC 값도 알루미나 나노섬유의 함량이 증가할수록 큰 값을 가지는 것을 확인할 수 있었으나 40 phr 이상에서는 오히려 감소하였다. 이는 과량의 알루미나 나노섬유가 에폭시 내에서 서로 뭉침으로 인하여 KIC 값을 감소시킨 것으로 판단된다.
In this work, the effect of alumina nanofibers on thermal conductivity and fracture toughness of alumina nanofibers and powder filled epoxy (EP) composites were investigated with varying alumina nanofiber content from 20 to 100 phr. Thermal conductivity was tested using a laser flash analysis (LFA). The fracture toughness of the composites were studied through the critical stress intensity factor (KIC) measurement. The mophologies were observed by scanning electron microscopy (SEM). From the results, it was found that the thermal conductivity was enhanced with increasing alumina nanofiber content, which played a key factor to determine the thermal conductivity. The KIC value was increased with increasing alumina nanofiber content, whereas the value decreased above 40 phr alumina nanofiber content. This was probably considered that the alumina nanofiber entangled each other in EP due to an excess of alumina nanofibers.
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