Effects of Hindered Phenol Organic Molecules on Enhancing Thermo-Oxidative Resistance and Damping Capacity for Nitrile Butadiene Rubber: Insights from Experiments and Molecular Simulation

Abstract

This work aims to investigate the thermo-oxidative aging and damping performances of hindered phenol filled nitrile butadiene rubber (NBR) organic hybrids by monitoring the changes in the static/dynamic mechanical properties and chemical structure under the influence of temperature. Compared with the unmodified NBR composite, hindered phenol presents remarkable effects on enhancing the thermo-oxidative stability and damping capacity of NBR materials. By combining experiment and molecular simulation results, the incorporation of polar hindered phenol improves the oxygen barrier ability of NBR composites, and its addition enhances the intermolecular interaction of these hybrids. Hindered phenol has a priority to terminate peroxy radicals due to its low chemical reaction energy. Moreover, we introduce thermodynamic analysis of hydrogen bond dissociation reaction (HBDR). The high enthalpy and low reaction equilibrium constant of HBDR result in excellent damping performance. This study is expected to help us understand the relationship between microstructures and properties for an organic-molecule-filled polymer system and to provide new insights into the development of high thermo-oxidative resistance and damping materials.

Investigation of the Compatibility and Damping Performance of Graphene Oxide Grafted Antioxidant/Nitrile-Butadiene Rubber Composite: Insights from Experiment and Molecular Simulation

“…For most rubbers, amine antioxidants are more effective in preventing long-term oxidative degradation [11]. Many researchers improve the phenomenon of rubber aging easily by adding a small molecular antioxidant, but the antioxidant tends to migrate from the rubber matrix due to their low molecular weight, thus affecting the damping effect, resulting in shortened service life and environmental pollution [12][13][14]. At present, there are two solutions: the first is to improve the molecular weight of antioxidants [15,16]; the second is to graft antioxidants to the polymer chain or filler surface [17][18][19][20][21], which is an effective method for anti-migration of antioxidants.…”

Bio-Based Polyurethane and Its Composites towards High Damping Properties

“…Composites can exploit the advantages of each component [ 34 , 35 , 36 , 37 , 38 ]. Thus, organic polar small molecules, such as hindered phenols and amines, are widely used to improve the T g and loss factor of polar substrates via the formation of hydrogen bonds between the large hydroxyl, ester, ether, and amine groups of these molecules and polar groups in the matrix [ 39 , 40 , 41 , 42 ].…”

Development of nitrile rubber/eucommia ulmoides gum composites for controllable dynamic damping and sound absorption performance

“…With the development of materials in recent decades, damping materials have become a growing research hotspot owing to the advantages of noise and vibration reduction. 4,5 Among them, rubber with its unique viscoelastic property exhibits obvious superiority in the aspect of vibration damping applications because rubber could consume noise and vibration energy as heat energy, which has been applied extensively in transportation equipment, building, aerospace and so on. 6,7…”