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Promising commercial reinforcement to the nanodiamond/epoxy composite by grafting ammonium ions

Journal of materials Science & technology 2018年第6期34卷 990-994页

作者： Qi Wang Guodong Wen Lingzhi Liu Bo Zhu Dangsheng Su School of materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences jiangsu gunuo new materials technology go. Ltd.

A simple, economic, efficient and eco-friendly nanodiamond （ND） modifying method to reinforce the ND]epoxy composite for the industrialization of the high-performance ND/epoxy composite is always desired. In the present work, the ND was successfully modified only using aqueous ammonia through an easy-to-operate method by replacing the hydrogen atoms in the carboxyl group with ammonium ions. Ammonia, which is the only pollutant in the process, could be recycled. The modified ND/epoxy composite showed an overwhelming advantage over the neat epoxy or the ND/epoxy composite in storage modulus in their glassy state without any degradation of tensile strength, hardness and fracture toughness.

关键词： Polymer-matrix composites Interface Mechanical properties Dynamic mechanical thermal analysis Nanodiamond/epoxy

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An effective and green H2O2/H2O/O3 oxidation method for carbon nanotube to reinforce epoxy resin

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Journal of materials Science & technology 2020年第5期40卷 24-30页

作者： Qi Wang Wen Shi Bo Zhu Dang Sheng Su School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for materials Science Shenyang 110016China jiangsu gunuo new materials technology go. Ltd.Yancheng 224051China

Facile green oxidation methods are always desired to functionalize carbon nanotubes(CNTs)in the production of advanced CNT/epoxy composites.In the present work,an optimized H2O2/H2O/O3 oxidation method was developed,and performances of the H2O2/H2O/O3 oxidized CNT in epoxy matrix were tested and compared with that of the H2O/O3 oxidized CNT and the most commonly used concentrated HNO3 oxidized CNT.The physical and chemical characteristics of the obtained oxidized CNTs were systematically characterized via transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS)and Raman.Mechanical performances of the obtained composites were explored by tensile tests,impact tests,dynamic mechanical analysis(DMA)and fracture toughness tests.It was found that the H2O2/H2O/O3 oxidized CNT exhibited all-around overwhelming advantages over the concentrated HNO3 oxidized CNT on reinforcing the epoxy matrix,while the H2O/O3 oxidized CNT only improved the material strength.Reinforcing mechanisms for the different methods oxidized CNTs were studied and compared.The optimized H2O2/H2O/O3 oxidation method makes scaled production possible,avoids environment pollutions,and holds great potentials to replace the most commonly used concentrated HNO3 oxidation method to oxidize CNT during the preparation of the advanced CNT/epoxy composite.

关键词： Green oxidation method Carbon nanotube Epoxy composite Mechanical properties Interfacial interaction

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