Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 155, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2020.104697
Keywords
Flame retardancy; Compatibility; Graphene; Epoxy composites; Phosphazene
Funding
- Natural Science Foundation of Jilin Province in China [20180101197jc]
- International Science and Technology Cooperation Programme of China [20190701001GH]
- National Natural Science Foundation of China [11602125]
- Beijing Institute of Technology Research Fund Program for Young Scholars in China
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To construct effective interfacial interactions between graphene-based flame retardants and epoxy resin (EP) matrixes, reactive cyclophosphazene was chemically synthesized with amino groups and grafted on graphene oxide (GO) to prepare a flame-retardant fGO nanosheets for EP nanocomposites. The obtained fGO presented good compatibility and endowed the composites with improved thermal stability and dynamic mechanical properties. With a low content of 1.0 wt.% fGO added, the EP nanocomposites exhibited distinctly lowered the peak of heat release rate, total heat release, and total smoke production by 49.0%, 21.1%, and 51.9%. Compact char residue layers and suppressed volatile products indicated the formation of protective char structures derived from fGO nanofillers. The flame-retardant mechanisms were investigated and ascribed to the effects in condensed and gas phases from phosphazene modified graphene components.
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