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首页> 外文期刊>Journal of enhanced heat transfer >THERMAL CONDUCTIVITY ENHANCEMENT OF POLYMERS VIA STRUCTURE TAILORING
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THERMAL CONDUCTIVITY ENHANCEMENT OF POLYMERS VIA STRUCTURE TAILORING

机译：通过结构剪裁聚合物的热导电增强

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摘要

Polymers are usually known for their low thermal conductivity. However, the demand in industries for polymers with high thermal conductivity has increasingly grown due to 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 thermal conductivity (k); however, it has been clearly observed 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 the perspectives of polymer intrinsic structure tailoring: crystallinity, orientation of the crystallites, crystalline grain size, and alignment of the molecular chain in the amorphous region. Structure tailoring methods of increasing/improving these four factors are critically reviewed and discussed. Accurate thermal characterization methods are critically reviewed for these structure-tailored polymers in low dimensions. The transient electro-thermal and pulsed laser-assisted thermal relaxation 2 techniques provide some of the best and most accurate thermal conductivity measurements with high physics control.
机译：聚合物通常已知其低导热率。然而，由于高密度，低成本，柔韧性和良好的环境阻力，具有高导热率的聚合物的需求越来越多地生长，与高导热率的常规物质相比，具有较低的密度，低成本，柔韧性和良好的环境阻。填充有高导热纳米填充物的复合材料将增加导热系数（k）;然而，已经清楚地观察到机械性能与此过程一起恶化。相反，增加聚合物本身的内在导热率更为重要。本综述重点是从聚合物内在结构剪裁的角度增加k的机制：结晶度，微晶的取向，结晶晶粒尺寸和非晶区域中分子链的对准。结构剪裁方法增加/改善这四种因素受到严格审查和讨论。准确的热表征方法对于这些结构定制的聚合物在低尺寸下进行批评。瞬态电热和脉冲激光辅助热弛豫2技术提供了一些具有高物理控制的最佳和最精确的导热率测量。

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