Facile Construction of Polypyrrole Microencapsulated Melamine-Coated Ammonium Polyphosphate to Simultaneously Reduce Flammability and Smoke Release of Epoxy Resin

A unique mono-component intumescent flame retardant, named PPy-MAPP, of which melamine-coated ammonium polyphosphate (MAPP) was microencapsulated by polypyrrole (PPy), was synthesized and carefully characterized. The obtained PPy-MAPP was applied to epoxy resin (EP) for obtaining flame-retarded EP c...

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Bibliographic Details
Published in:Polymers 2022-06, Vol.14 (12), p.2375
Main Authors: Wang, Feiyue, Liao, Jiahao, Yan, Long, Cai, Mengtao
Format: Article
Language:English
Subjects:
Additives
Carbon
Composite materials
Composition
Enthalpy
Epoxy resins
Ethanol
Fireproofing agents
Flame retardants
Flammability
Heat resistance
Mechanical properties
Mechanical tests
Melamine
Modulus of elasticity
Particle size
Polymers
Polyphosphates
Polypyrroles
Reduction
Scanning electron microscopy
Smoke
Spectrum analysis
Tensile strength
Thermal properties
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Summary:A unique mono-component intumescent flame retardant, named PPy-MAPP, of which melamine-coated ammonium polyphosphate (MAPP) was microencapsulated by polypyrrole (PPy), was synthesized and carefully characterized. The obtained PPy-MAPP was applied to epoxy resin (EP) for obtaining flame-retarded EP composites. The results show that PPy-MAPP imparts better flame retardancy and smoke suppression properties to EP compared to the same addition of MAPP. The EP composite with 15 wt% PPy-MAPP easily passes the UL94 V-0 rating and achieves an LOI value of 42.4%, accompanied by a 61.9% reduction in total heat release (THR) and a 73.9% reduction in total smoke production (TSP) when compared with pure EP. The char residue analysis shows that PPy-MAPP can promote a generation of more phosphorus-rich structures in the condensed phase that improve the integrity and intumescence of char against fire. The mechanical test indicates that PPy-MAPP has a less negative effect on the tensile strength and elastic modulus of epoxy resin due to the good compatibility between PPy-MAPP and the EP matrix, as supported by differential scanning calorimetry (DSC) analyses. In this paper, these attractive features of PPy-MAPP provide a new strategy to prepare satisfactory flame retardant and super flame retarding EP composites.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14122375