Highly stretched polyethylene nanofibers are demonstrated to have thermal conductivities as high as ~ 100 W/m.K along the fiber direction, which is comparable to many metals and is 3 orders of magnitude larger than the typical thermal conductivity of bulk polymers. The high thermal conductivity is attributed to the restructure of polymer chains in nanofibers by stretching, which improves the fiber quality toward the "ideal" single crystalline fibers. Our results suggest that high thermal conductivity polyethylene nanofibers may be able to serve as a cheaper alternative to conventional metal-based heat transfer materials in a wide range of applications.
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机译:高拉伸聚乙烯纳米纤维沿纤维方向的热导率高达100 W / m.K,与许多金属相当,比本体聚合物的典型热导率大3个数量级。高热导率归因于纳米纤维中聚合物链通过拉伸的重组,从而改善了朝向“理想”单晶纤维的纤维质量。我们的结果表明,高导热率的聚乙烯纳米纤维在广泛的应用领域中可以作为常规金属基传热材料的廉价替代品。
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