Polyethylene nanofibres with very high thermal conductivities
Polyethylene nanofibres with very high thermal conductivities
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DOI：
10.1038/nnano.2010.27
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发表时间：
2010-04-01
影响因子：
38.3
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Shen, Sheng;Henry, Asegun;Chen, Gang
本体聚合物通常被认为是热绝缘体，并且通常具有0.1 W m（-1）K-1量级的热导率（参考文献1）。然而，最近的工作（2-4）表明，聚乙烯的单个链-最简单和最广泛使用的聚合物-可以具有极高的导热性。这些聚合物的实际应用还可能需要单个链形成纤维或膜。在这里，我们报告了高质量的超拉伸聚乙烯纳米纤维的制造，直径为50-500 nm，长度可达数十毫米。发现纳米纤维的热导率高达类似于104 W m（-1）K-1，这大于约一半的纯金属的热导率。高导热性归因于聚合物链通过拉伸的重组，这提高了纤维质量朝向“理想的”单晶纤维。这种导热聚合物可能用作散热器，并可以补充传统的金属传热材料，这些材料用于太阳能热水收集器，热交换器和电子封装等应用。
Bulk polymers are generally regarded as thermal insulators, and typically have thermal conductivities on the order of 0.1 W m(-1) K-1 (ref. 1). However, recent work(2-4) suggests that individual chains of polyethylene-the simplest and most widely used polymer-can have extremely high thermal conductivity. Practical applications of these polymers may also require that the individual chains form fibres or films. Here, we report the fabrication of high-quality ultra-drawn polyethylene nanofibres with diameters of 50-500 nm and lengths up to tens of millimetres. The thermal conductivity of the nanofibres was found to be as high as similar to 104 W m(-1) K-1, which is larger than the conductivities of about half of the pure metals. The high thermal conductivity is attributed to the restructuring of the polymer chains by stretching, which improves the fibre quality toward an 'ideal' single crystalline fibre. Such thermally conductive polymers are potentially useful as heat spreaders and could supplement conventional metallic heat-transfer materials, which are used in applications such as solar hot-water collectors, heat exchangers and electronic packaging.