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%。
The 3 D graphene-multi walled carbon nanotube/thermoplastic polyurethane(GA-MWCNTs/TPU) composites were prepared using 3 D 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 3 D 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 10 wt%, 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%.
作者
赵梁成
李斌
武思蕊
李仲明
李覃
ZHAO Liangcheng;LI Bin;WU Sirui;LI Zhongming;LI Qin(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2020年第2期242-251,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51167008)
关键词
多壁碳纳米管
氧化石墨烯
热塑性聚氨酯
导电性
热稳定性
力学性能
multi walled carbon nanotubes
graphene oxide
thermoplastic polyurethane
electrical conductivity
thermal stability
mechanical properties
