Phosphorus‐containing Salen‐Ni metal complexes enhancing the flame retardancy and smoke suppression of epoxy resin composites

ABSTRACT Two novel Salen‐DPCPs metal complexes (Salen‐DPCP‐1 and Salen‐DPCP‐2), containing both Salen‐Schiff base (Salen), phenyl phosphate structures (DPCP) and nickel component, were prepared to reduce fire hazards of epoxy resin (EP). The results showed that 5 wt % addition of Salen‐DPCP‐1 brough...

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Bibliographic Details
Published in:Journal of applied polymer science 2020-06, Vol.137 (21), p.n/a
Main Authors: Cui, Jinfeng, Zhang, Yabin, Wang, Lurong, Liu, He, Wang, Niannian, Yang, Baoping, Guo, Junhong, Tian, Li
Format: Article
Language:English
Subjects:
Composite materials
Coordination compounds
Enthalpy
Epoxy resins
Fire hazards
flame retardancy
Fourier transforms
Imines
Materials science
Morphology
Nickel
Organic chemistry
phosphorus
Photoelectrons
polymer composites
Polymer matrix composites
Polymers
Salen
Smoke
smoke suppression
Structural analysis
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Summary:ABSTRACT Two novel Salen‐DPCPs metal complexes (Salen‐DPCP‐1 and Salen‐DPCP‐2), containing both Salen‐Schiff base (Salen), phenyl phosphate structures (DPCP) and nickel component, were prepared to reduce fire hazards of epoxy resin (EP). The results showed that 5 wt % addition of Salen‐DPCP‐1 brought a higher flame‐retardant efficiency to the EP, where the V‐0 rating in UL‐94 burning test and 31.5% of limiting oxygen index (LOI) were achieved. Meanwhile, total heat release, total smoke production, and total CO yield dramatically decreased by 28.1, 23.6, and 21.4%. In addition, these results basically reappeared when Salen‐DPCP‐2 were introduced into EP to obtain Salen‐DPCP‐2/EP composites. Chemical structure and morphology characterization of the carbon residue confirmed that Salen‐DPCPs improved the catalytic charring ability and the noncombustible gas releasing ability by the Fourier transform infrared, X‐ray photoelectron spectroscopy, and Scanning electron microscopy technology. Therefore, it is an efficient strategy to develop novel Salen composites modified by flame‐retardant groups to improve the fire rating of polymers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48734.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.48734