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

서지정보

· 발행기관 : 한국탄소학회
· 수록지 정보 : Carbon letters / 33권 / 2호
· 저자명 : Chunhong Zhang, Zice Xu, Wenbo Sui, Junbo Zang, Yuhui Ao, Lu Wang, Lei Shang

목차

Abstract
Graphical abstract
1 Introduction
2 Experimental
2.1 Materials
2.2 Synthesis steps of ionic liquid [Dmim]Es
2.3 Preparation of ionic liquid [Dmim]EsGra epoxy composites
2.4 Characterization
3 Results and discussions
3.1 Characterization of [Dmim]EsGra
3.2 Mechanical properties of the nanocomposite material
3.3 Thermal stability of EP and nanocomposites
3.4 Flame retardancy of EP [Dmim] EsGra composites
3.5 Analysis on char residue
3.6 Flame-retardant mechanism
4 Conclusions
Acknowledgements
References

영어초록

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.

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