Fabricating advanced polymer composites with remarkable mechanical and thermal conductivity performances is desirable for developing advanced devices and equipment. In this study, a novel strategy to prepare anisotropic wood-based scaffolds with a naturally aligned microchannel structure from balsa wood is demonstrated. The wood microchannels were coated with polydopamine-surface-modified small graphene oxide (PGO) nanosheets via assembly. The highly aligned porous microstructures, with thin wood cell walls and large voids along the cellulose microchannels, allow polymers to enter, resulting in the fabrication of the wood–polymer nanocomposite. The tensile stiffness and strength of the resulting nanocomposite reach 8.10 GPa and 90.3 MPa with a toughness of 5.0 MJ m^–3. The thermal conductivity of the nanocomposite is improved significantly by coating a PGO layer onto the wood scaffolds. The nanocomposite exhibits not only ultrahigh thermal conductivity (in-plane about 5.5 W m^–1 K^–1 and through-plane about 2.1 W m^–1 K^–1) but also satisfactory electrical insulation (volume resistivity of about 10¹⁵ Ω·cm). Therefore, the results provide a strategy to fabricate thermal management materials with excellent mechanical properties.

中文翻译：

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用于热管理应用的高性能木材衍生复合材料

制造具有卓越机械和导热性能的先进聚合物复合材料是开发先进设备和设备的理想选择。在这项研究中，展示了一种从轻木中制备具有自然排列的微通道结构的各向异性木基支架的新策略。木材微通道通过组装涂有聚多巴胺表面改性的小氧化石墨烯 (PGO) 纳米片。高度排列的多孔微结构，具有薄木细胞壁和沿纤维素微通道的大空隙，允许聚合物进入，从而制造木材-聚合物纳米复合材料。所得纳米复合材料的拉伸刚度和强度分别达到 8.10 GPa 和 90.3 MPa，韧性为 5.0 MJ m ^–3. 通过在木质支架上涂覆 PGO 层，纳米复合材料的热导率得到显着提高。纳米复合材料不仅表现出超高的热导率（面内约 5.5 W m ^–1 K ^–1和面内约 2.1 W m ^–1 K ^–1），而且还具有令人满意的电绝缘性（体积电阻率约为 10 ¹⁵ Ω·cm ）。因此，该结果为制造具有优异机械性能的热管理材料提供了一种策略。