Enhancement of Thermal Conductivity of Polyvinyl Alcohol Membrane Using Nano-fiber
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Enhancement of Thermal Conductivity of Polyvinyl Alcohol Membrane Using Nano-fiber Xiandong Chen1,2#, Meng An1,2#, Rulei Guo1,2, Ni Tang3,4, Zhan Peng1,2, Hao Feng1,2, Xiaobo Li1,2, Jianfeng Zang3,4,*, Nuo Yang1,2,*
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State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China 2 Nano Interface Center of Energy (NICE), School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China 3 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China 4 Innovation Institute, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China #Xiandong Chen and Meng An contributed equally to this work. *Corresponding authors: N.Y. ([email protected]) J. F. Z. ([email protected]) ABSTRACT The thermal properties of organic membranes attract much attention due to the fact that heat dissipation in electronic devices limits their functionality and reliability. Here, we enhance the thermal conductivity of polyvinyl alcohol (PVA) membrane using nano-fibers fabricated by electrospinning. Measured by the 3-Omega method, the results show that the effective thermal conductivity of the electrospinning membranes (with/without Cu nanoparticles) are as high as 0.7 W/m-K at room temperature which is as twice as the value of thermal conductivity of amorphous spin-coated PVA membrane (0.35 W/m-K). The mechanism of enhancement are that, compared with amorphous membrane, the phonon scattering is attenuated and the crystallinity is improved in the electrospinning process. Our studies bring new insights in designing new kind of membrane with high thermal conductivity. INTRODUCTION Polymers are widely used in our daily life as well as in industry such as printed circuit boards (PCBs) [1], thermal interface materials (TIMs) [2], and device bases/holders [3] owing to the advantages such as cheap cost, insulation and easy processing. However, its low thermal conductivity largely affects the capability and stability of electronic devices [4, 5]. PVA is one of the most commonly used macromolecule material in industry, amorphous PVA is regarded as heat insulator for its low thermal conductivity(~0.3 W/m-K) [6]. However, Sheng Shen [7] measured the thermal conductivity of single chain PE using SThM in 2010, the thermal conductivity is as high as 104 W/m-K, which is three magnitude higher than that of bulk PE. Others also made organic aligned nano-fiber [8] and membrane [9] with relatively high thermal conductivity. It shows that polymers have the potential to be used for heat dissipation in electric devices. Some results show that adding carbon nanotubes [10] and metallic oxide nanoparticles [11] is positive to the enhancement of thermal conductivity, do the nano-particles have positive effect on the thermal conductivity of nano-fiber membrane? In our study, we fabricated PVA spin coated membrane, electrospinning PVA n
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