期刊
EUROPEAN POLYMER JOURNAL
卷 167, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2022.111075
关键词
Flame retardancy; Nanohybrids; Phosphazene; Mechanical enhancement; Epoxy resins
资金
- National Natural Science Foundation of China [52003063, 52122302, 51563004]
- Foundation of Guilin University of Technology [GUTQDJJ2018088]
- Guangxi Provin-cial Foundation, China [AD19110106]
- Natural Science Foundation of Guangxi Province [2021GXNSFBA196070]
- Young Elite Scientists Sponsorship Program by CAST
- Fundamental Research Funds for the central Universities
A novel nanohybrid has been designed to enhance the flame retardancy and mechanical strength of epoxy resin at a low filler loading. By combining mesoporous SiO2 with organophosphorus compounds on the surface of graphene oxide, an interpenetrating network structure is formed, leading to improved properties of the composite material.
We design a novel hetero-structured nanohybrid that can significantly improve flame retardancy and mechanical strength of epoxy resin (EP) at an ultralow filler loading. In this nanohybrid (SPGP), mesoporous SiO2 combined with organophosphorus compounds are grafted onto the surface of graphene oxide relying on the interface adhesion of polydopamine. As a result, the molecular chains of EP can be introduced into the channels of mesoporous SiO2 to form an interpenetrating network structure, thus leading to great dispersion of SPGP. In the case of introducing only 1 wt% SPGP, the impact strength of the composite is greatly increased by ~100%, while the flame retardancy of the material is significantly improved with a high limiting oxygen index of 28%, low heat release, low CO production rate and smoke suppression. Furthermore, the mechanism analysis confirms that mesoporous SiO2, organophosphorus units, and graphene oxide in SPGP can synergistically promote the formation of the denser P-Si-containing hybrid char layer to enhance the barrier effect during combustion, thus suppressing fire hazards of EP. This work provides a new strategy for the design and manufacture of nanohybrids with high flame retardancy, mechanical reinforcement and low toxicity for polymers.
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