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Synergistic flame‐retardant effect and mechanisms of boron/phosphorus compounds on epoxy resins
Author(s) -
Tang Shuo,
Qian Lijun,
Qiu Yong,
Dong Yuping
Publication year - 2018
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4174
Subject(s) - fire retardant , epoxy , materials science , boron , zinc borate , charring , thermosetting polymer , boron oxide , composite number , flammability , combustion , chemical engineering , composite material , organic chemistry , chemistry , engineering
To explore the component synergistic effect of boron/phosphorus compounds in epoxy resin (EP), 3 typical boron compounds, zinc borate (ZB), boron phosphate (BPO 4 ), and boron oxide (B 2 O 3 ), blended with phosphaphenanthrene compound TAD were incorporated into EP, respectively. All 3 boron/phosphorus compound systems inhibited heat release and increased residue yields and exerted smoke suppression effect. Among 3 boron/phosphorus compound systems, B 2 O 3 /TAD system brought best flame‐retardant effect to epoxy thermosets in improving the UL94 classification of EP composites and also reducing heat release most efficiently during combustion. B 2 O 3 can interact with epoxy matrix and enhance the charring quantity and quality, resulting in obvious condensed‐phase flame‐retardant effect. The combination of condensed‐phase flame‐retardant effect from B 2 O 3 and the gaseous‐phase flame‐retardant effect from TAD effectively optimized the action distribution between gaseous and condensed phases. Therefore, B 2 O 3 /TAD system generated component synergistic flame‐retardant effect in epoxy thermosets.