Preparation and properties of 3D graphene-multi walled carbon nanotube/thermoplastic polyurethane composites
-
摘要: 采用水热还原法将羧基化多壁碳纳米管（MWCNTs—COOH）接枝到氧化石墨烯（GO）上，经冷冻干燥得到三维石墨烯-多壁碳纳米管气凝胶（GA-MWCNTs），再以热塑性聚氨酯（TPU）为填充体，通过真空浸渍法制得三维石墨烯-多壁碳纳米管/热塑性聚氨酯（GA-MWCNTs/TPU）复合材料。借助FTIR、Raman、XPS、TEM、SEM，对GA-MWCNTs的化学结构、微观形貌进行表征，并通过TGA-DSC、电阻测量仪和力学试验机，分析MWCNTs—COOH质量分数对GA-MWCNTs/TPU复合材料性能的影响。结果表明：MWCNTs—COOH在GO片层间起到交联和支撑作用，形成了蜂窝状三维网络结构，其孔径约为1.2 mm；当MWCNTs—COOH质量分数（以120 mg GO为基准）为10wt%时，GA-MWCNTs/TPU复合材料的导电性、热稳定性、力学性能均得到改善，相比于GA/TPU，体积电阻率降低了63.0%、热分解温度提高了7℃、30%应变下的应力提高了8.2%。Abstract: The 3D graphene-multi walled carbon nanotube/thermoplastic polyurethane (GA-MWCNTs/TPU) composites were prepared using 3D graphene-multi walled carbon nanotubes aerogels (GA-MWCNTs) and thermoplastic polyurethane (TPU). GA-MWCNTs was prepared by hydrothermal reduction method for grafting carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) onto graphene oxide (GO) and then freeze-drying. Subsequently, the filling TPU was impregnated the GA-MWCNTs in a vacuum state to obtain the GA-MWCNTs/TPU composite. The chemical structure and microstructure of GA-MWCNTs were characterized by means of FTIR, Raman, XPS, TEM and SEM, then MWCNTs-COOH mass fraction effect on the GA-MWCNTs/TPU composite performance was analyzed by means of TGA-DSC, resistance measuring instrument and mechanical testing machine. The results demonstrate that MWCNTs-COOH can cross-linking and support the GO inter-lamellar structures, forming a honeycomb 3D network structure with a pore size of about 1.2 mm. When the mass fraction of MWCNTs-COOH (using 120 mg GO as reference) is 10wt%, the electrical conductivity, thermal stability and mechanical properties of GA-MWCNTs/TPU composite are greatly improved. Compared with the GA/TPU, the volume resistivity of GA-MWCNTs/TPU composite reduces by 63.0%, thermal decomposition temperature increases by 7℃, and the stress at 30% strain increases by 8.2%.
-
-
计量
- 文章访问数: 850
- HTML全文浏览量: 74
- PDF下载量: 205
下载:
