Multifunctional nanocomposites based on tetraethylenepentamine-modified graphene oxide/epoxy |
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| Institution: | 1. Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;2. Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;3. Centro de Microscopia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;4. Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, Brazil;1. Institute for Sustainability and Innovation, College of Engineering and Science, Victoria University, PO Box 14428, Melbourne, 8001, Australia;2. College of Engineering and Science, Victoria University, PO Box 14428, Melbourne, 8001, Australia;1. Technische Universität Dresden, Institut für Leichtbau und Kunststofftechnik, 01062 Dresden, Germany;2. Leichtbau-Zentrum Sachsen GmbH, Marschnerstraße 39, 01307 Dresden, Germany;1. College of Engineering and Design, Hunan Normal University, Changsha, Hunan 410081, China;2. KINGFA Technology Co., Ltd, Guangzhou, Guangdong 510640, China;3. College of Mechanical and Electrical Engineering, Central South University, 410083, China |
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| Abstract: | Composites based on epoxy/graphene were investigated for thermal-mechanical performance. Initially, few-layer graphene oxide (GO) was modified with tetraethylenepentamine (GO-TEPA) in a reaction assisted by microwave radiation. GO and GO-TEPA samples were characterized for their structure and morphology. Composites containing 0.1, 0.3 and 0.5 wt.% of GO and GO-TEPA were prepared, and the effect of fillers on the morphology of cryofractured regions of epoxy matrix was observed through electron microscopy images. Dynamic mechanical thermal analysis (DMA) tests revealed increases of approximately 20 °C in glass transition. Moreover, when compared to neat polymer, composites containing 0.5 wt.% of GO-TEPA gained up to 103% in thermal conductivity (obtained by flash laser). Finally, nanoindentation analyses showed increases of 72% in Young's modulus and 143% in hardness for the same sample. The system is characterized as multifunctional nanocomposites because of the simultaneous gains in thermal and mechanical properties. The best results of the multifunctional composites were strongly associated with the chemical modification of the GO by TEPA. |
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| Keywords: | Graphene oxide Epoxy Nanocomposite Nanoindentation Flash laser |
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