Densely Packed Polymer/Boron Nitride Composite for Superior Anisotropic Thermal Conductivity
Densely Packed Polymer/Boron Nitride Composite for Superior Anisotropic Thermal Conductivity
复制标题
致密聚合物/氮化硼复合材料具有卓越的各向异性导热性
DOI：
10.1002/pc.24615
复制
发表时间：
2018-06-01
影响因子：
5.2
通讯作者：
Chen, Liangyao
中科院分区：
文献类型：
--
作者：
Zhu, Zhijia;Wang, Pengxiang;Chen, Liangyao
高导热性能的电绝缘复合材料在电子设备的热管理中是非常需要的。在这项研究中，致密填充的氮化硼（BN）复合材料与树脂基体的环氧树脂，聚甲基丙烯酸甲酯，丙烯酸共聚物基粘结剂通过溶剂介导的混合和压缩成型方法制备。溶剂介导的混合有助于均匀分散;压缩成型去除了过量的树脂并导致具有高填料含量的BN薄片对齐。所得复合材料表现出优异的上级面内热导率k//高达21.3 W/mK和显著的各向异性导热性能。在实验中，导热系数与试样的密度ρ呈正相关。提出了导热系数k=kρ的表达式，并从数学上证明了导热系数与试样密度dk（ρ）/dρ > 0的关系。展示了BN复合材料在LED热管理中的应用。使用环氧树脂/BN散热器来有效地冷却0.3-W LED。冷却效果接近铝板散热器。Polym.比较器：2017.© 2017塑料工程师协会
High heat conduction performance of electrical insulating composite is highly desired in thermal management of electronics. In this study, densely packed boron nitride (BN) composites with resin matrices of epoxy, polymethyl methacrylate, and an acrylic copolymer based binder were prepared through a solvent mediated mixing and compression molding method. The solvent mediated mixing assisted homogeneous dispersion; the compression molding removed excessive resin and led to alignment of BN flakes with high filler content. The resulted composites exhibited superior in-plane thermal conductivity k// up to 21.3 W/mK and pronounced anisotropic heat conduction properties. The thermal conductivity was positively correlated with density ρ of a specimen in experimental. A presentation of thermal conductivity k=kρ was proposed, and the dependence of thermal conductivity on specimen density dk(ρ)/dρ > 0 was proven mathematically. The application of BN composite in LED thermal management was demonstrated. An epoxy/BN heat spreader was used to efficiently cool down a 0.3-W LED. The cooling effect was close to that with Al board heat spreader. POLYM. COMPOS., 2017. © 2017 Society of Plastics Engineers