Journal
POLYMER DEGRADATION AND STABILITY
Volume 187, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2021.109544
Keywords
Epoxy resin; Flame retardancy; Lower phosphorus content; Gas phase; Condensed phase
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Funding
- National Key R&D Program of China [2018YFC0809500]
- National Natural Science Foundation of China [U1633203, U1733126]
- General Program of Civil Aviation Flight University of China [J2020-111]
- Sichuan Science and Technology Program [2018GZYZF0069]
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DOPO-BAPh, synthesized through graft reaction, enhanced the flame retardancy of phosphorus/nitrogen-containing compound on epoxy resin, further improving the stability of the char layer formed after combustion, enabling the EP to achieve better flame retardant rating.
A phosphorus/nitrogen-containing compound (named DOPO-BAPh) was synthesized via the graft reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and bisphenol A bis(phthalonitrile) containing benzoxazine. The flame retardancy of DOPO-BAPh was investigated on epoxy resin (EP). The results showed that DOPO-BAPh catalyzed the curing reaction of due to the phenolic hydroxyl groups in the structure. The nitrile group in DOPO-BAPh was self-cured in EP to form cross-linked networks containing aromatic heterocycles, further enhancing the stability of the char layer formed after combustion. The introduction of DOPO-BAPh strengthened flame retardancy of the EP. With only 0.26 wt.% phosphorus of loading level, the modified EP reached an LOI value of 35.8% and obtained V-0 rating in UL-94 testing. And DOPO-BAPh exhibited char-forming ability during the decomposition. Besides, the DOPO-BAPh showed flame-retardant activity in both the gas and condensed phases. (C) 2021 Elsevier Ltd. All rights reserved.
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