Tuning the Physicochemical Structure of Graphene Oxide by Thermal Reduction Temperature for Improved Stabilization Ability toward Polymer Degradation
2020
Liu, Shixiang | Yao, Jialu | Liu, Qiang | Huang, Yajiang | Kong, Miqiu | Yang, Qi | Li, Guangxian
The unique sp²-bonded structure of graphene sheets not only enables many functional applications but also endows graphene with an attractive free radical scavenging activity to prevent the thermo-oxidative degradation of polymers. In this study, the effect of thermal reduction temperature (Tᵣ) on the structural evolution and free radical scavenging capacity of thermally reduced graphene oxide (TRGO) is explored within 200–1000 °C. The completeness and size of sp² hybrid domains, which can be tailored by changing the thermal reduction temperature, are suggested to be key factors determining the free radical scavenging activity of TRGO. As the Tᵣ increases from 200 to 800 °C, the stabilization ability of TRGO against the thermo-oxidative degradation of isotactic polypropylene is enhanced gradually because of the removal of oxygen-containing functional groups and the restoration of sp² hybrid domains. However, further elevating Tᵣ to higher temperatures such as 1000 °C will lead to the formation of a large number of hole defects on the TRGO platelets, possibly because of the removal of lots of oxygen-containing functional groups and the destruction of their ordered structure.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library