New insights into thermal conductivity of uniaxially stretched high density polyethylene films
New insights into thermal conductivity of uniaxially stretched high density polyethylene films
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单轴拉伸高密度聚乙烯薄膜导热性的新见解
DOI：
10.1016/j.polymer.2018.08.078
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发表时间：
2018-10
期刊：
影响因子：
4.6
通讯作者：
Ai Lu
中科院分区：
文献类型：
--
作者：
Richao Zhang;Zhihuan Huang;Dan Sun;Dehui Ji;Meiling Zhong;Dongmian Zang;Jia-Zhuang Xu;Yizao Wan;Ai Lu
摘要聚乙烯（PE）拉伸纤维的导热性能已被广泛研究，而拉伸PE片材的导热性能仍不清楚。此外，还没有达成共识的结论，热传导机制提请PE。在这项工作中，熔融加工的PE片材在不同的拉伸比下进行单轴拉伸。通过二维广角X射线衍射（2D-WAXD）和扫描电子显微镜（SEM）测量了拉伸PE的面内和面外热导率，分析了拉伸PE的结晶结构。结果表明，拉伸PE的面内和面外热导率均随拉伸比的增加而增加。热传导性的增强归因于拉伸过程引起的连锁串晶超结构的形成。提出了一种新的模型来证明单轴拉伸PE的热导率的改善。据我们所知，这是第一次揭示了单轴拉伸半结晶PE片材的导热增强机制，沿着与相关的工艺-结构-性能关系的理解。这项工作可能会提供关键信息的设计和制造的聚合物基材料的热管理应用。
Abstract Thermal conductivity of drawn polyethylene (PE) fibers has been extensively studied, while thermal conductivity for the stretched PE sheets still remains unknown. In addition, no consensus conclusions have been reached on the thermal conduction mechanisms for drawn PE. In this work, melt processed PE sheets are subjected to uniaxial stretching under different stretch ratios. The in-plane and out-of-plane thermal conductivity of stretched PE has been measured and the crystalline structure has been analyzed through 2-dimensional wide-angle X-ray diffraction (2D-WAXD) and scanning electron microscopy (SEM). Results show that both in-plane and out-of-plane thermal conductivities of stretched PE increase with increasing stretch ratios. The enhancement of thermal conductivity has been ascribed to the formation of interlocking shish-kebab superstructures induced by the stretching process. A new model is proposed to demonstrate the thermal conductivity improvement seen for the uniaxial-stretched PE. To the best of our knowledge, it is the first time that the mechanisms of thermal conductive enhancement were revealed for uniaxially stretched semi-crystalline PE sheet along with the understanding of the associated process-structure-property relationship. This work may provide key information towards design and manufacturing of polymer-based materials for thermal management applications.
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