期刊
COMPOSITES PART B-ENGINEERING
卷 129, 期 -, 页码 133-142出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2017.07.085
关键词
Nanocomposites; Graphene; Cryogenic temperature; Fracture toughness
资金
- Space Core Technology Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2013M1A3A3A02042257]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2016R1D1A1B03932101]
- Korea University of Technology and Education Post-doctoral fellowship
- National Research Foundation of Korea [31Z20130012915] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Epoxy polymers are actively used in high-end technological applications. However, a major drawback of epoxies is their brittle mechanical behavior especially at cryogenic temperatures. Here we report a novel filler (GO-PDA) of poly (p-phenylenediamine) (PDA) nano-sized particles attached to graphene oxide (GO) sheets. Chemical analysis showed the attachment of PDA particles to GO through amidation of carboxylic groups. Transmission electron microscopy showed that PDA particles are uniform and spherical of approximate to 70 nm in size. Selected area electron diffraction showed that these particles are crystalline. Mechanical properties of epoxy/GO-PDA composite are tested at 25 degrees C (RT) and 120 degrees C (CR) temperatures. Young's modulus was not remarkably affected by GO-PDA addition. However, strength, fracture strain and toughness showed improvement at relatively low GO-PDA wt%. Microstructural analysis of fractured surfaces showed that the fracture mechanism is dependent on testing temperature. GO-PDA has a very good strengthening and toughening effects for epoxy without compromising the modulus both at RT and CR . (C) 2017 Elsevier Ltd. All rights reserved.
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