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Enhanced thermal conductivity of polyethylene/boron nitride multilayer sheets through annealing
Composites Part A: Applied Science and Manufacturing ( IF 8.7 ) Pub Date : 2018-01-03 , DOI: 10.1016/j.compositesa.2017.12.031
Shu-Ya Yang , Yan-Fei Huang , Jun Lei , Lei Zhu , Zhong-Ming Li

Polyethylene/hexagonal boron nitride (PE/h-BN) composite sheets with enhanced thermal conductivity were fabricated through annealing a multilayered structure of alternating high density PE (HDPE)/h-BN composite and low density PE (LDPE) layers. Multilayer sheets possess a relatively low initial content filler, and after thermal annealing at 200 °C, the PE molecules in the composite layers diffused into neighboring layers. As a result, the h-BN concentration in the composite layers increased with the annealing time, resulting in the formation of thermal conduction pathways and enhancement of the final thermal conductivity. When the volume content of h-BN was 5.97 vol.%, the through-plane thermal conductivity of the annealed specimen was 1.37 W m−1 K−1, which showed an enhancement of ∼180% compared to the value of the neat composite with the same content of randomly dispersed h-BN. Our work suggests that this facile method is promising for the development of high-performance thermally conductive products.



中文翻译:

通过退火提高聚乙烯/氮化硼多层板的导热性

通过对交替交替的高密度PE(HDPE)/ h-BN复合材料和低密度PE(LDPE)层的多层结构进行退火,来制造具有增强的导热性的聚乙烯/六方氮化硼(PE / h-BN)复合片材。多层片材具有相对较低的初始含量填料,并且在200°C下进行热退火后,复合层中的PE分子扩散到相邻层中。结果,复合层中的h-BN浓度随着退火时间的增加而增加,导致形成热传导路径并提高最终的热导率。当h-BN的体积含量为5.97vol。%时,退火样品的贯穿面热导率为1.37 W m -1  K -1,与具有相同含量的随机分散的h-BN的纯净复合材料的值相比,显示出约180%的增强。我们的工作表明,这种简便的方法对于开发高性能导热产品很有希望。

更新日期:2018-01-03
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