Synthesis of a DOPO Derivative to Improve the Fire Safety and Mechanical Performance of Epoxy Resin

A 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) derivative is prepared. At first, an intermediate 4,4'‐((triazole)bis(azaneylylidene)bis(2,6‐dimethoxyphenol)) (SGA) is obtained from the Schiff‐base reaction between syringaldehyde (S) and 3,5‐diamino‐1,2,4‐triazole (GA). The further...

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Bibliographic Details
Published in:Macromolecular materials and engineering 2023-05, Vol.308 (5), p.n/a
Main Authors: Hua, Yifang, Sun, Jun, Jiang, Shengling, Gu, Xiaoyu, Zhang, Sheng
Format: Article
Language:English
Subjects:
Cone calorimeters
Curing agents
DOPO derivatives
epoxy resin
Epoxy resins
Fire protection
Fire safety
flame retardants
Flammability
Impact strength
Mechanical properties
Resins
Syringaldehyde
Tensile strength
toughness
Triazoles
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Summary:A 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) derivative is prepared. At first, an intermediate 4,4'‐((triazole)bis(azaneylylidene)bis(2,6‐dimethoxyphenol)) (SGA) is obtained from the Schiff‐base reaction between syringaldehyde (S) and 3,5‐diamino‐1,2,4‐triazole (GA). The further product DOPO‐SGA is then introduced into epoxy by blending to improve flame retardancy and mechanical properties. The flammability evaluation is implemented by limited oxygen index (LOI), UL‐94, and cone calorimeter tests. The presence of 3wt.% DOPO‐SGA increases the LOI to 33.2%, upgrades the UL‐94 rating to V‐0, and reduces the release of smoke and heat of epoxy. The tensile strength and impact strength are also enhanced after the introduction of DOPO‐SGA. The addition of 5% DOPO‐SGA increases the tensile strength and impact strength by 47% and 42%, respectively, compared with that of the control EP sample. It is suggested that the mechanical strengthening is ascribed to the ternary cross‐linked network among epoxy monomer, curing agent, and DOPO‐SGA. This work provides a feasible solution to obtain flame‐retardant epoxy resin with enhanced mechanical performance. A DOPO derivative (DOPO‐SGA) is fabricated via a Schiff base addition reaction of DOPO, syringaldehyde, and 3,5‐diamino‐1,2,4‐triazole. The cured epoxy resin containing DOPO‐SGA exhibits improved flame retardancy. No dripping is produced in the burning, and the sample self‐extinguished after leaving the fire. The tensile strength and impact strength of the sample containing DOPO‐SGA are higher than the control EP sample.
ISSN:1438-7492
1439-2054
DOI:10.1002/mame.202200565