Bimetallic metal-organic frameworks and graphene oxide nano-hybrids for enhanced fire retardant epoxy composites: A novel carbonization mechanism. (November 2019)

• Record Type: Journal Article
• Authors: Zhang, Jing; Li, Zhi; Zhang, Lu; García Molleja, Javier; Wang, De-Yi
• Is Part Of: Carbon. Volume 153(2019)
• Page Start: 407
• Page End: 416
• Publication Date: 2019-11
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.07.003
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The fire retarded intumescent epoxy resin (EP) composites were fabricated with the incorporation of bimetallic metal-organic framework (MOF) and graphene oxide (GO) nano-hybrids (MOF@GO) with intumescent fire retardants (IFR). EP/0.5MOF@GO-9.5IFR composite exhibited a 41% decrease in peak heat release rate, 30% decrease in total smoke production compared to reference sample EP/10IFR. According to in-situ morphology observation and X-ray tomography result, we observed such a novel carbonization phenomenon forming an alternately loose and accumulated structure. The further carbonaceous char analysis indicated the formation of a reinforced structure with fewer pores and excellent insulated property. Temperature test revealed that the synergistic effect between MOF@GO and IFR promoted the construction of the insulated carbonaceous char, which can maintain its temperature at around 400 °C, thus providing sufficient time to build up the alternative reinforced char. Besides, the mechanical property of EP composite was also improved with a 11% increase in the tensile strength compared with that of EP/10IFR. In perspective, the observed carbonization phenomenon opens a window for understanding the mechanism for intumescent fire retardants. Graphical abstract: Image 1