Structure and electric heating performance of graphene/epoxy composite films

Preparation and property investigation of multi-walled carbon nanotube (MWCNT)/epoxy composite films as high-performance electric heating (resistive heating) element

“…Unlike the graphene/epoxy composite films [8], the τ g values of the MWCNT/epoxy composite films were not strongly dependent on the MWCNT content within the experimental error. The average τ g value of 8.05±0.65 s for all the composite films was slightly higher than that of the graphene/epoxy [8] and graphene/ MWCNT/epoxy [9] composite films, while it was found to be lower than that of the MWCNT/ polyethylene composite reported in the literature [14]. This result demonstrates that the MWCNT/epoxy composite films in this paper exhibited a significantly rapid temperature response to the applied voltage.…”

“…The h r+c value was found to increase slightly with the MWCNT content because of the higher equilibrium temperatures at an identical voltage, which intensifies the heat exchange with the composite films and its surroundings. In addition, compared with the h r+c values for other carbon nanofiller/epoxy [8,9] and MWCNT/polyethylene [14] composites, the average h r+c value of 4.88±0.68 mW/°C for the composite films in this paper is excellent, which indicates that MWCNT/epoxy composite films exhibited excellent electric heating efficiency by applying a comparatively low electric power to reach a high equilibrium temperature. When the applied voltage was turned off at 120 s, the electric heating behaviour disappeared, and the surface temperature gradually cooled down to the ambient temperature in accordance with Newton's law of cooling.…”

“…In the case of CNT/ EP_0.05, the surface temperature remained at ambient temperature without any obvious change under a relatively low voltage of 10 V, which indicates that the electric current throughout the composite film was not enough to cause a surface temperature change. However, when applied voltages above 20 V were applied at 5 s, the surface temperature increased rapidly, reached an equilibrium temperature within ~30 s, remained at the equilibrium temperature up to 120 s, and then cooled down to ambient temperature within a brief period as the applied voltage was turned off at 120 s. Compared with the graphene/epoxy [8] and graphene/MWCNT/epoxy [9] composite films, the electric heating behaviour of the MWCNT/epoxy composite films was observed at a lower filler content, and this observation was associated with the nanostructure and dispersion state of the CNTs. For the other composite films with higher MWCNT contents of 0.07-2.0 wt%, similar electric heating behaviour was observed, and the noticeable difference was that the equilibrium temperature at an identical applied voltage was even higher with the increasing MWCNT content.…”

Photo-reduction of Graphene Oxide during Photo-polymerization of Graphene Oxide/Epoxy-Novolac Nanocomposite Coatings

“…The superior properties of GO are also reflected in polymer/GO nanocomposites. As is reported in other studies, Gr, GO or functionalized Gr have been added into various polymer matrices, resulting in remarkably reinforcing properties [5][6][7][8].…”

Characteristics of Graphene Production from Graphite using Plant Extracts

“…열전도도는 금 속인 구리보다 크고, 투명한 특성 덕분에 휘거나 비틀어도 손 상되지 않는 터치스크린, 태양전지판 등 각종 전자장치에 이 용될 수 있다 [2]. 그래핀은 다른 물질과 결합하여 기존 물질 의 강도를 늘리거나 열 및 전기전도도를 향상시킬 수 있다 [3]. 또한 최근 들어 약물전달, 암 치료, 생물학적 이미징 등 생물의약분야에 그래핀을 이용하려는 시도가 활발하다 [4].…”