Thermal conductivity of MWCNT/epoxy composites: The effects of length,alignment and functionalization |
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Authors: | Jin Gyu Park Qunfeng Cheng Jun Lu Jianwen Bao Shu Li Ying Tian Zhiyong Liang Chuck Zhang Ben Wang |
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Affiliation: | 1. High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA;2. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA |
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Abstract: | Carbon nanotubes (CNTs) show great promise to improve composite electrical and thermal conductivity due to their exceptional high intrinsic conductance performance. In this research, long multi-walled carbon nanotubes (long-MWCNTs) and its thin sheet of entangled nanotubes were used to make composites to achieve higher electrical and thermal conductivity. Compared to short-MWCNT sheet/epoxy composites, at room temperature, long-MWCNT samples showed improved thermal conductivity up to 55 W/mK. The temperature dependence of thermal conductivity was in agreement with κ ∝ Tn (n = 1.9–2.3) below 150 K and saturated around room temperature due to Umklapp scattering. Samples with the improved CNT degree of alignment by mechanically stretching can enhance the room temperature thermal conductivity to over 100 W/mK. However, functionalization of CNTs to improve the interfacial bonding resulted in damaging the CNT walls and decreasing the electrical and thermal conductivity of the composites. |
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