研究目的
研究基于Friedel-Crafts反应通过共价修饰石墨烯纳米片增强新型聚酰亚胺纳米复合材料的制备，以提升其力学和摩擦学性能。
研究成果
将AGNS掺入PI基体显著提升了纳米复合材料的力学和摩擦学性能，在0.5 wt%的AGNS负载量下观察到最佳性能。AGNS与PI基体之间的共价键合是性能提升的关键，这表明其在耐磨材料中具有潜在应用价值。
研究不足
该研究聚焦于通过AGNS增强PI纳米复合材料，但未探讨合成工艺的可扩展性或纳米复合材料在不同环境条件下的长期稳定性。
1：实验设计与方法选择：
通过Friedel-Crafts反应和硝基还原制备胺功能化石墨烯纳米片（AGNS），随后原位聚合制备PI/AGNS纳米复合材料。
2：样品选择与数据来源：
以原始GNS为起始材料，采用多种表征技术分析所得纳米复合材料的性能。
3：实验设备与材料清单：
设备包括FTIR光谱仪、拉曼光谱仪、XPS光谱仪、TEM、TGA分析仪、万能试验机、SEM、FESEM和球盘摩擦试验机；材料包括GNS、PPA、PNBA、SnCl2、DMAc、PMDA和ODA。
4：DMAc、PMDA和ODA。 实验流程与操作步骤：
4. 实验流程与操作步骤：包括AGNS制备、DMAc分散、与ODA和PMDA聚合以及热亚胺化，最终制得PI/AGNS纳米复合薄膜。
5：数据分析方法：
分别采用拉伸测试和摩擦测试分析力学与摩擦学性能，数据处理后评估性能提升效果。
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X-ray photoelectron spectroscopy
ESCALAB 250XI
Thermo Fisher Scientific
Detected the element composition of the amino-functionalized graphene nanosheets.
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Universal testing machine
AGS-X 5 KN
Shimadzu
Assessed tensile testing of PI composite films.
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Graphene nanosheets
GNS
Tanfeng Tech. Inc.
Reinforcing filler to enhance mechanical performance and improve wear resistance of polyimide matrix.
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Polyphosphoric acid
PPA
Sinopharm Chemical reagent Co. Ltd.
Used in the preparation of AGNS.
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p-nitrobenzoic acid
PNBA
Sinopharm Chemical reagent Co. Ltd.
Used in the preparation of AGNS.
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Stannous chloride dehydrate
SnCl2
Sinopharm Chemical reagent Co. Ltd.
Used in the preparation of AGNS.
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N,N-dimethylacetamide
DMAc
Sinopharm group chemical reagent Co. Ltd.
Solvent used in the preparation of PI composite.
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Pyromellitic dianhydride
PMDA
Sinopharm group chemical reagent Co. Ltd.
Raw material for the preparation of PI composite.
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4,4-oxidianiline
ODA
Sinopharm group chemical reagent Co. Ltd.
Raw material for the preparation of PI composite.
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Fourier transform infrared spectrometer
Nicolet AVATAR360 FTIR Spectrometer
Conducted FTIR spectra at room temperature.
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Raman spectrometer
DXR laser Raman spectrometer
Determined Raman spectroscopy before and after F–C reaction and nitroreduction.
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Transmission electron microscope
JEM-2100
Examined the microstructures of the amino-functionalized graphene nanosheets.
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Thermogravimetry analyzer
Netzsch STA449C
Performed TGA analysis for the GNS, AGNS, and PI/AGNS nanocomposites films.
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Scanning electron microscopy
JSM-6700F
Characterized the morphologies of tensile fracture surfaces of nanocomposites.
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Field emission scanning electron microscope
S-4800
Observed the morphology of cross section of nanocomposite.
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Ball-on-disk machine
MS-T3001
Conducted friction tests to investigate the tribological performance in seawater and air conditions.
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GCr15-bearing steel balls
Used to generate friction in the test.
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Metalloscope
Zeiss Observer Z1 m
Examined the wear depth and width to analyze the friction behavior.
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Three-dimensional profiler
Keyence VHX-1000
Examined the wear depth and width to analyze the friction behavior.
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