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High‐yield water‐phase exfoliated few‐defect graphene for high performance polymer nanocomposites
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2020-06-26 , DOI: 10.1002/app.49586
Peng Wang 1 , Mengxing Li 1 , Jiajia Zhang 1 , Lei Dong 2 , Hongbin Lu 1
Affiliation  

Application of graphene requires a high‐yield, low‐cost, scalable production method, but it remains highly challenging. We here report a water‐phase technique to produce few‐defect graphene nanosheets (FGS) with a high exfoliation yield (92%), based on the chemically expanded graphite with ultrahigh specific surface areas, and demonstrate the application in graphene‐polymer nanocomposites. The exfoliated FGS has low degree of oxidation and preserves good mechanical and electrical properties, revealing promising potential for improving comprehensive properties of polymer composites. When 0.5 wt% FGS was incorporated to poly(methyl methacrylate) (PMMA), the 5% weight loss temperature and storage modulus increase by 87°C and 21%, respectively, relative to the neat polymer. With increasing the content of FGS to 4.6 wt%, the glass transition temperature of the composite increases by 25°C. In addition, the composites show a percolation threshold as low as 0.25 vol% and excellent electrical conductivity (50 S/m for 2.7 vol% FGS‐PMMA composite).

中文翻译:

高性能聚合物纳米复合材料的高产水相剥落少缺陷石墨烯

石墨烯的应用需要一种高产量,低成本,可扩展的生产方法,但仍具有很高的挑战性。我们在此报告了一种水相技术,该技术以具有超高比表面积的化学膨胀石墨为基础,生产出具有高剥离率(92%)的极少缺陷的石墨烯纳米片(FGS),并展示了其在石墨烯聚合物纳米复合材料中的应用。剥落的FGS具有较低的氧化度,并保留了良好的机械和电气性能,具有改善聚合物复合材料综合性能的潜力。当将0.5重量%的FGS掺入聚(甲基丙烯酸甲酯)(PMMA)中时,相对于纯净聚合物,5%的失重温度和储能模量分别增加了87℃和21%。随着FGS含量增加到4.6 wt%,复合材料的玻璃化转变温度升高25°C。此外,该复合材料的渗透阈值低至0.25 vol%,并且具有出色的导电性(对于2.7 vol%的FGS-PMMA复合材料,其渗透率为50 S / m)。
更新日期:2020-06-26
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