Preparation of Expanded Graphite and Graphite Nanosheets for Improving Electrical Conductivity of Polyester Coating Films.

Yun Ding, Mingxia Tian, Aili Wang, Hengbo Yin
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引用次数: 3

Abstract

Expanded graphite and graphite nanosheets were facilely prepared by the thermal expansion of expandable graphite at 800 °C and sand milling of expanded graphite in water, respectively. When the expandable graphite precursor was prepared by the oxidation and intercalation of natural graphite (5 g) using KMnO₄ (6 g) as an oxidant in a concentrated sulfuric acid solution (120 mL) at room temperature (25 °C) for 8 h, the expanded graphite with a maximum volumetric rate of 317 mL g-1 was prepared after the thermal expansion of the expandable graphite precursor at 800 °C for 60 s. The oxidation extent of natural graphite with KMnO₄ is crucial for the preparation of expanded graphite. The thicknesses of graphite nanosheets decreased from 8.9 to 3.2 nm when the sand milling time of the expanded graphite in deionized water was prolonged from 6 to 24 h. The prolonging of the sand milling time not only decreased the layer number of the graphite nanosheet but also increased the d002 spacing due to the shocking and shearing forces. The addition of the expanded graphite powder and graphite nanosheets in a polyester paint efficiently improved the electrical conductivity of the resultant polyester coating films.
提高聚酯涂层电导率的膨胀石墨和石墨纳米片的制备。
在800℃下对膨胀石墨进行热膨胀,在水中对膨胀石墨进行砂磨,制备了膨胀石墨和石墨纳米片。将天然石墨(5 g)以硫酸钾(6 g)为氧化剂,在浓硫酸溶液(120 mL)中室温(25℃)氧化插层制备膨胀石墨前驱体,在800℃下热膨胀60 s,制备出体积率最大为317 mL g-1的膨胀石墨。硫酸钾氧化天然石墨的程度对膨胀石墨的制备至关重要。当去离子水磨砂时间由6 h延长至24 h时,石墨纳米片的厚度由8.9 nm减小到3.2 nm。磨砂时间的延长不仅使石墨纳米片的层数减少,而且由于冲击力和剪切力的作用,石墨纳米片的d002间距增大。在聚酯涂料中加入膨胀石墨粉和石墨纳米片,有效地提高了所得聚酯涂料薄膜的导电性。
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来源期刊
Journal of nanoscience and nanotechnology
Journal of nanoscience and nanotechnology 工程技术-材料科学:综合
自引率
0.00%
发文量
0
审稿时长
3.6 months
期刊介绍: JNN is a multidisciplinary peer-reviewed journal covering fundamental and applied research in all disciplines of science, engineering and medicine. JNN publishes all aspects of nanoscale science and technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, theory and computation, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology.
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