Zhong Rui, Zhang Zhao, Zhao Hongguo, He Xianru, Wang Xin, Zhang Rui
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.
Materials (Basel). 2018 May 30;11(6):921. doi: 10.3390/ma11060921.
Graphene oxide (GO), modified with anti-aging agent -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.
将用抗老化剂 - 对苯二胺（PPD）改性的氧化石墨烯（GO）添加到丁腈橡胶（NBR）中，以提高NBR的热氧化稳定性。通过傅里叶变换红外光谱（FTIR）、拉曼光谱和X射线衍射（XRD）对GO的改性和官能团的转变进行了表征。记录了热氧化老化前后NBR复合材料的力学性能。动态力学分析（DMA）结果表明，将改性GO引入NBR后，储能模量（G'）增加，tan δ峰面积值减小。这表明填料颗粒与分子链表现出正相互作用。通过热重分析（TG）和差示扫描量热法（DSC）研究了复合材料的热氧化稳定性。然后，通过Flynn-Wall-Ozawa（FWO）方程获得热氧化老化动力学参数。老化试验结果表明，引入GO-PPD后橡胶基体的热氧化稳定性明显提高。此外，老化前后的NBR/GO-PPD复合材料的力学性能（拉伸强度和断裂伸长率）均优于NBR。这项工作为实现多功能抗热氧化老化橡胶复合材料提供了有意义的指导。
