Study on NO2 Barrier Properties of RTV Silicone Rubber by Incorporation of Functional Graphene Oxide

In this study, functional graphene oxide (f-GO) nanosheets were prepared to enhance the NO2 resistibility of room-temperature-vulcanized (RTV) silicone rubber. A nitrogen dioxide (NO2) accelerated aging experiment was designed to simulate the aging process of nitrogen oxide produced by corona discharge on a silicone rubber composite coating, and then electrochemical impedance spectroscopy (EIS) was used to test the process of conductive medium penetration into silicone rubber. After exposure to the same concentration (115 mg center dot L-1) of NO2 for 24 h, at an optimal filler content of 0.3 wt.%, the impedance modulus of the composite silicone rubber sample was 1.8 x 10(7) omega center dot cm(2), which is an order of magnitude higher than that of pure RTV. In addition, with an increase in filler content, the porosity of the coating decreases. When the content of the nanosheet increases to 0.3 wt.%; the porosity reaches a minimum value 0.97 x 10(-4)%, which is 1/4 of the porosity of the pure RTV coating, indicating that this composite silicone rubber sample has the best resistance to NO2 aging.

Automated summary

In this study, functional graphene oxide (f-GO) nanosheets were used to enhance the NO2 resistibility of room-temperature-vulcanized (RTV) silicone rubber. An accelerated aging experiment was conducted to simulate the aging process of nitric oxide on a silicone rubber composite coating, and the penetration of conductive medium was tested using electrochemical impedance spectroscopy (EIS). The composite silicone rubber sample with 0.3 wt.% filler content showed significantly higher impedance modulus and lower porosity compared to pure RTV, indicating superior resistance to NO2 aging.