Journal
CHEMOSPHERE
Volume 273, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129658
Keywords
Epoxy resin; Magnesium hydroxide; DOPO; Flame retardancy; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51863019]
- Science and Technology Program of Gansu Province [19JR2RA020]
- program for Changjiang Scholars and Innovative Research Team in University [IRT15R56]
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education
- Key Laboratory of Eco-environmental Polymer Materials of Gansu Province
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A novel organic-inorganic hybrid flame retardant, DMMH, was synthesized and incorporated into an epoxy resin, showing improved flame retardance without sacrificing mechanical properties.
In this study, a novel organic-inorganic hybrid flame retardant 10-(1,4-dicarboxylic acid magnesium salt)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DMMH) was synthesized via neutralization and addition reaction of maleic acid, magnesium hydroxide and 9,10-dihydro-9-oxa-10phosphaphenanthrene-10-oxide (DOPO), and subsequently used in an intrinsic flame retardant epoxy resin. The chemical structure and morphology of DMMH were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Further, the prepared DMMH was combined with ammonium polyphosphate (APP) to form an intumescent flame retardant system. The thermal stability and flame retardance were evaluated by thermogravimetric analysis (TG), UL-94 vertical burning test, limiting oxygen index (LOI) and cone calorimetry. It was observed that the addition of 1.7% DMMH and 5.3% APP led EP-7 to acquire UL-94 V-0 rating, with the limiting oxygen index of 26.0%. As compared with pure EP, the peak heat release rate, total heat release, smoke production rate and total smoke production of the sample was noted to decrease by 54.5%, 35.1%, 43.6% and 38.1%, respectively. In addition, the introduction of DMMH did not negatively impact the mechanical properties of the epoxy resin. (C) 2021 Elsevier Ltd. All rights reserved.
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