Qin Yuyang, Peng Qingyu, Zhu Yue, Zhao Xu, Lin Zaishan, He Xiaodong, Li Yibin
Center for Composite Materials and Structures, Harbin Institute of Technology Harbin 150080 P. R. China
School of Chemistry and Materials Engineering, Changshu Institute of Technology Changshu 215500 P. R. China.
Nanoscale Adv. 2019 Nov 1;1(12):4895-4903. doi: 10.1039/c9na00444k. eCollection 2019 Dec 3.
We report that lightweight, anisotropic, mechanically flexible, and high performance thermally insulating materials are fabricated by the assembly of graphene oxide (GO) and polyimide (PI). With an appropriate ratio between GO and PI building blocks, the rGO/PI thermally insulating material exhibits hierarchically aligned microstructures with high porosity. These microstructures endow the rGO/PI nanocomposite with low mass density and super-insulating property (extremely low thermal conductivity of 0.012 W m K in the radial direction). Meanwhile, the introduction of PI enhances the mechanical strength and thermal stability of rGO foam. Our rGO/PI nanocomposites as super-insulating foams with a low thermal conductivity are highly attractive for potential thermal insulation applications in aerospace, wearable devices, and energy-efficient buildings.
我们报道了通过氧化石墨烯（GO）和聚酰亚胺（PI）的组装制备出了轻质、各向异性、机械柔性且高性能的隔热材料。在GO和PI构建单元之间具有适当比例时，还原氧化石墨烯/聚酰亚胺（rGO/PI）隔热材料呈现出具有高孔隙率的分层排列微结构。这些微结构赋予rGO/PI纳米复合材料低质量密度和超级隔热性能（径向热导率极低，为0.012 W m⁻¹ K⁻¹）。同时，PI的引入增强了rGO泡沫的机械强度和热稳定性。我们的rGO/PI纳米复合材料作为具有低导热率的超级隔热泡沫，对于航空航天、可穿戴设备和节能建筑中的潜在隔热应用极具吸引力。
