Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 148, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2020.104485
Keywords
Flame retardancy; EP composites; Microcapsules; Phosphazene; Additives
Funding
- Natural Science Foundation of Jilin Province, China [20180101197jc]
- International Science and Technology Cooperation Programme, China [20190701001GH]
- National Natural Science Foundation of China [11602125]
- Beijing Institute of Technology Research Fund Program for Young Scholars, China
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Epoxy resin (EP) composites with improved flame retardancy were fabricated. To solve the problem of the large addition of phosphazene flame retardants, we designed a system based on phosphorus nitrogen silicon synergistic flame-retardant Si(H) microcapsules with silica as the shell and hexaphenoxycyclotriphosphazene as the core. Si(H)/EP composites were manufactured with two coupling agents to promote interactions. In cone calorimetric tests, heat and gas releases of Si(H)/EP composites were reduced, and fire hazard was minimized. Residual analysis indicated the strong rigidity and mechanical robustness. The mechanism included phosphorus quenching effect and nitrogenous diluting effect of flame inhibition effect in gas phase, and phosphorus charring effect and silicic barrier and protective effect in solid phase. This research provides an effective flame-retardant method for EP composites with a low additive content.
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