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Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation & School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
Petrochemical Research Institute, PetroChina, Lanzhou 730060, China
Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18051 Rostock, Germany
Authors to whom correspondence should be addressed.
Materials 2018, 11(6), 921;
Received: 11 April 2018 / Revised: 15 May 2018 / Accepted: 23 May 2018 / Published: 30 May 2018
Graphene oxide (GO), modified with anti-aging agent p-phenylenediamine (PPD), was added into nitrile rubber (NBR) in order to improve the thermo-oxidative stability of NBR. The modification of GO and the transformation of functional groups were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, and X-ray diffraction (XRD). Mechanical performances of NBR composites before and after the thermo-oxidative aging were recorded. The results of dynamic mechanical analysis (DMA) show an increased storage modulus (G’) and a decreased value of area of tan δ peak after introducing modified GO into NBR. It indicates that filler particles show positive interaction with molecular chains. The thermo-oxidative stability of composites was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). Then, the thermo-oxidative aging kinetic parameters were obtained by the Flynn–Wall–Ozawa (FWO) equation. The results of aging tests show that the thermo-oxidative stability of rubber matrix increases obviously after introducing GO–PPD. In addition, mechanical properties (tensile strength and elongation at break) of both before and after aged NBR/GO–PPD composites were superior to that of NBR. This work provides meaningful guidance for achieving multifunction thermo-oxidative aging resistance rubber composites. View Full-Text
Keywords: graphene oxide (GO); p-phenylenediamine (PPD); nitrile rubber (NBR); thermo-oxidative stability graphene oxide (GO); p-phenylenediamine (PPD); nitrile rubber (NBR); thermo-oxidative stability
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Zhong, R.; Zhang, Z.; Zhao, H.; He, X.; Wang, X.; Zhang, R. Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide. Materials 2018, 11, 921.

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