Acyl-chloride functionalized graphene oxide chemically grafted with hindered phenol and its application in anti-degradation of polypropylene

• Published in: Progress in natural science 2020-06, Vol.30 (3), p.328-336
• Main Authors: Yao, Jialu, Liu, Shixiang, Huang, Yajiang, Ren, Shijie, Lv, Yadong, Kong, Miqiu, Li, Guangxian
• Format: Article
• Language: English
• Subjects: Graphene oxide; Hindered phenols; Photo oxidation; Polypropylene; Thermal oxidation
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2020.05.010

In this study, graphene oxide (GO) nanosheets were first functionalized by the acyl-chloride reaction and then reacted with hindered phenol (HP) to obtain HP grafted GO (GO-g-HP). The GO-g-HP prepared under the optimized condition exhibited a high efficiency against both thermal and photo oxidation of isotactic polypropylene (iPP). GO-g-HP exhibited a much better anti-aging efficiency than that of HP and GO used individually or that of their physical mixture. The outstanding anti-aging effect of GO-g-HP was attributed to the excellent synergistic effect produced between the chemically bonded GO and HP, which resulted in an improved oxygen barrier property of GO and excellent utilization of the free radical scavenging capability of GO and HP. Also, thanks to the grafting of HP on GO, the physical loss of HP, which was one of the main shortcomings for traditional small molecular antioxidants, was largely suppressed. It is expected that the GO-g-HP prepared can well meet the requirement of long-term applications of polymers in some harsh service conditions. [Display omitted] •HPs were chemically grafted onto the functionalized GO surface to prepare GO-g-HP.•Effect of different reaction conditions on the grafting quantity of HP on GO was studied.•GO-g-HP could effectively suppress the thermal and photo-oxidation of iPP.•The good stabilization is explained by the synergism between GO and HP and the reduced physical loss of HP.