THERMAL CONDUCTIVITY ENHANCEMENT OF POLYMERS VIA STRUCTURE TAILORING
THERMAL CONDUCTIVITY ENHANCEMENT OF POLYMERS VIA STRUCTURE TAILORING
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DOI：
10.1615/jenhheattransf.2020034592
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发表时间：
2020
影响因子：
2.3
通讯作者：
Shen Xu;Jing Liu;Xinwei Wang
中科院分区：
文献类型：
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作者：
Shen Xu;Jing Liu;Xinwei Wang
申旭a，刘静，王新伟a a，上海工程科学大学机械与汽车工程学院，上海201620，中国b深圳理工大学新材料与新能源学院，深圳518118，中国c爱荷华州立大学机械工程系，Ames，Iowa 50011，美国抽象聚合物以其低的导热系数而闻名。然而，与传统的高导热材料相比，高导热聚合物具有密度低、成本低、柔韧性好、耐环境性能好等优点，在当今的工业中受到越来越多的需求。填充高导热纳米填料的复合材料会增加导热系数(K)，但可以明显地注意到，随着这一过程的进行，复合材料的力学性能会恶化。相反，提高聚合物本身的本征导热系数更为重要。本文从结晶度、微晶取向、晶体大小、分子链在非晶区的排列等几个方面综述了聚合物的内在结构调整对K增加的机理。对增加/改善这四个因素的结构剪裁方法进行了批判性的回顾和讨论。对低维结构定制聚合物的精确热表征方法进行了综述。瞬变电热(TET)和脉冲激光辅助加热
Shen Xu a, , Jing Liu , and Xinwei Wang c a School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China b College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, P.R. China c Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA Abstract Polymers are usually known for its low thermal conductivity. However, high thermal conductive polymers are in growing demand in industry nowadays for their low density, low cost, flexibility, and good environmental resistance compared with conventional substances of high thermal conductivity. Composites filled with high thermal conductivity nanofillers will increase the thermal conductivity (k) but it is clearly noticed that the mechanical properties will deteriorate along with this process. Instead, increasing the intrinsic thermal conductivity of polymers themselves is more important. This review focuses on the mechanism of increasing k from perspectives of polymer intrinsic structure tailoring: crystallinity, orientation of crystallites, crystalline grain size, and the alignment of molecular chain in amorphous region. Structure tailoring methods of increasing/improving those four factors are critically reviewed and discussed. Accurate thermal characterization methods are critically reviewed for those structure-tailored polymers in low dimensions. The transient electro-thermal (TET) and pulsed laser-assisted thermal