A 3D-printer based on digital-light-processing (DLP) was used to build a 3D foam containing graphene nanopowder (GNP) as a thermally conductive filler. 1,6-hexanediol diacrylate (HDDA) was used as a UV-curable resin because of its low viscosity and high fidelity during printing. Foam-shaped GNP-containing HDDA was placed in a disc-shaped Teflon mold, followed by infiltration of epoxy and thermal curing. The construction of a 3D heat path was achieved by selective GNP particle distribution on the HDDA matrix. According to the GNP filler fraction of the foam-shaped composite, epoxy composite with random GNP filler distribution was also fabricated, to investigate the effect of selective to random GNP distribution and the presence of a 3D heat path on thermal conductivity enhancement. When 1.93 wt% GNP was selectively distributed, the composite exhibited about 14.6% higher thermal conductivity compared to samples with random GNP distribution. The enhanced thermal conductivity could be attributed to efficient heat transfer through the heat path constructed inside the polymer matrix.

使用基于数字光处理（DLP）的3D打印机来构建包含石墨烯纳米粉（GNP）作为导热填料的3D泡沫。1,6-己二醇二丙烯酸酯（HDDA）由于其低粘度和高保真度而被用作UV固化树脂。将含有泡沫状的GNP的HDDA放入盘状的Teflon模具中，然后渗透环氧树脂并进行热固化。通过在HDDA矩阵上进行选择性GNP粒子分配，可以构建3D热路径。根据泡沫状复合材料的GNP填料比例，还制备了具有随机GNP填料分布的环氧复合材料，以研究选择性GNP到随机GNP分布以及3D热路径的存在对导热系数增强的影响。当1.93％（重量）GNP被选择性地分配，与具有随机GNP分布的样品相比，该复合材料的导热率高出约14.6％。增强的导热率可归因于通过在聚合物基质内部构造的热路径的有效热传递。