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

Rui Zhong,Rui Zhang,Hongguo Zhao,Xianru He,Zhao Zhang,Xin Wang

doi:10.3390/ma11060921

Abstract

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.

Highlights

The ability of an elastomeric composition to apply at elevated temperature for a long time is a paramount requirement in many fields, such as tire [1], sealing [2], viscoelastic damping materials [3], etc
The and offunctionalization of Graphene oxide (GO) are confirmed by Fourier transform infrared spectroscopy (FTIR) spectroscopy (Figure 1)
This paper has demonstrated that graphene oxide has a ridged and corrugated structure after

Summary

Introduction

The ability of an elastomeric composition to apply at elevated temperature for a long time is a paramount requirement in many fields, such as tire [1], sealing [2], viscoelastic damping materials [3], etc. NBR elastomer products usually work at an elevated temperature (up to 120 ◦ C) and high pressure, at the same time [4,5,6]. The existence of unsaturated isolated double bonds makes it easy for NBR to be decomposed by oxygen, especially under conditions of high heat and pressure [4]. For this case, many nanofillers have been applied to improve thermal stability of NBR, including silica [7], carbon nanotube [8], Fe3 O4 [9], graphene, etc. Many nanofillers have been applied to improve thermal stability of NBR, including silica [7], carbon nanotube [8], Fe3 O4 [9], graphene, etc. [10]

Methods

Results

Conclusion