Synergistic effect of novel ionic liquid/graphene complex on the flame retardancy of epoxy nanocomposites

Epoxy resin (EP) is a thermosetting resin with excellent properties, but its application is limited due to its high brittleness and poor flame retardancy. Therefore, to solve this problem, a dispersion system of imidazole-containing ionic liquid ([Dmim]Es) and graphene in epoxy resin is designed bas...

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Bibliographic Details
Published in:Carbon Letters 2023-03, Vol.33 (2), p.501-516
Main Authors: Zhang, Chunhong, Xu, Zice, Sui, Wenbo, Zang, Junbo, Ao, Yuhui, Wang, Lu, Shang, Lei
Format: Article
Language:English
Subjects:
Carbon
Chloride
Composite materials
Crosslinking
Curing
Dispersion
Epoxy resins
Flame retardants
Graphene
Imidazole
Ionic liquids
Mechanical properties
Morphology
Nanocomposites
Nanoparticles
Nanostructure
Phosphorus
Polymers
Raw materials
Sample size
Synergistic effect
Tensile properties
Thermal stability
Thermosetting resins
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Summary:Epoxy resin (EP) is a thermosetting resin with excellent properties, but its application is limited due to its high brittleness and poor flame retardancy. Therefore, to solve this problem, a dispersion system of imidazole-containing ionic liquid ([Dmim]Es) and graphene in epoxy resin is designed based on the π–π stacking effect between imidazole and graphite layers. The study on the thermal and flame-retardant properties of the composites show that the modified [Dmim]Es–graphene nanosheets improved the flame retardancy, smoke suppression and thermal stability of epoxy resin. With the addition of 5wt% [Dmim]Es and 1% Gra, the exothermic rate (HRR) and total exothermic (THR) of the composites decrease by 35% and 30.2% compared with the untreated epoxy cross-linking, respectively. The limiting oxygen index reaches 33.4%, the UL-94 test rating reaches V-0. The characterization of mechanical properties shows that the tensile properties and impact properties increased by 13% and 30%, respectively. Through SEM observation, the addition of [Dmim]Es improves the dispersion of graphene in the EP collective and changes the mechanical fracture behavior. The results show that ionic liquid [Dmim]Es-modified graphene nanosheets are well dispersed in the matrix, which not only improves the mechanical properties of epoxy resin (EP), but also has a synergistic effect on flame retardancy. This work provides novel flame-retardant and graphene dispersion methods that broaden the range of applications of epoxy resins.
ISSN:1976-4251
2233-4998
DOI:10.1007/s42823-022-00440-9