3D-printed polymer composites with acoustically assembled multidimensional filler networks for accelerated heat dissipation
3D-printed polymer composites with acoustically assembled multidimensional filler networks for accelerated heat dissipation
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DOI：
10.1016/j.compositesb.2019.106991
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发表时间：
2019-10-01
影响因子：
13.1
通讯作者：
Pan, Yayue
中科院分区：
文献类型：
--
作者：
Lu, Lu;Zhang, Zhifeng;Pan, Yayue
含有导热填料的聚合物复合材料在解决对电子设备至关重要的过热问题方面显示出巨大的希望。近年来功能性高分子复合材料的成功开发依赖于优异的填充性能和高负荷。然而，密集的填料加载导致了制造和复合材料性能的挑战。本研究报告了一种功能颗粒-聚合物复合材料设计和制造的替代方法：代替重载荷，少量填料组成高度集中的多维网络，作为聚合物基体中散热的主动路径。一种名为声场辅助投影立体光刻的新型3D打印技术实现了这种复合材料的制造。网络中局部填料的重量比为原料填料的7倍。在相同的原料下，图案复合材料的散热效率比均匀复合材料高10倍。当填充量相同时，图案复合材料的散热速度是均匀复合材料的两倍。此外，三维填充网络优于二维网络，说明更高的网络维数有利于多向传热。这种新的复合材料设计和制造方法具有较低的填充物消耗和较高的设计灵活性，克服了填充物载荷的限制。
Polymer composites containing thermally conductive fillers show great promise in solving the overheating issue which is critical for electronic devices. Recent successes in developing functional polymer composites rely on the excellent filler property and heavy loading. Yet the intensive filler loading leads to challenges in manufacturing and composite properties. This study reports an alternative method for functional particle-polymer composite design and fabrication: instead of heavy loading, a small amount of filler composes highly concentrated multidimensional network functioning as active paths for heat dissipation in the polymer matrix. A novel 3D printing technique named acoustic field-assisted projection stereolithography realizes the fabrication of such composites. The local filler weight ratio in the network is > 7 times of the feedstock filler loading. With the same feedstock, the patterned composite exhibits >10 times higher efficiency in heat dissipation, compared to the uniform composite. With the same amount of fillers embedded, the patterned composite accelerates the heat dissipation twice than the uniform composite. Moreover, 3D filler network outperforms 2D network, showing that the higher network dimension is conducive to multidirectional heat transfer. With a low filler consumption while higher design flexibility, this new composite material design and manufacturing approach overcomes restriction caused by filler loading.