Enhanced thermal conductivity of polyethylene/boron nitride multilayer sheets through annealing
Enhanced thermal conductivity of polyethylene/boron nitride multilayer sheets through annealing
复制标题
通过退火增强聚乙烯/氮化硼多层片材的导热性
DOI：
10.1016/j.compositesa.2017.12.031
复制
发表时间：
2018-04-01
影响因子：
8.7
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Yang, Shu-Ya;Huang, Yan-Fei;Li, Zhong-Ming
采用高密度聚乙烯(HDPE)/六方氮化硼(h-BN)复合材料和低密度聚乙烯(LDPE)层状交替排列的多层结构进行热处理，制备了具有较高导热系数的聚乙烯/六方氮化硼(PE/h-BN)复合片。多层片材的初始填充物含量相对较低，在200℃热处理后，复合层中的PE分子扩散到相邻的层中。结果表明，h-BN在复合层中的浓度随退火时间的延长而增加，形成导热通道，最终导热系数提高。当h-BN的体积分数为5.97vol.%时，退火样的平面导热系数为1.37Wm(-1)K-1，与相同h-BN含量的纯净复合材料相比，提高了180%。我们的工作表明，这种简便的方法对于开发高性能的导热产品是很有前途的。(C)2018爱思唯尔有限公司。保留所有权利。
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 degrees 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. (C) 2018 Elsevier Ltd. All rights reserved.