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- Title
Enhancement of fire safety in epoxy resin composites through incorporation of microencapsulated diatomite.
- Authors
Jin Wang; Xiaoyue Shen; Mengwei Jiang; Fang Zhou; Yupeng Zhang
- Abstract
Diatomite (DIA) particles are commonly employed as flame-retardant additives for polymers, yet their intrinsic inefficiency requires substantial quantities for optimal efficacy. To address this issue, we proposed a novel approach involving the microencapsulation of DIA with polyethylene glycol phosphate (PEGP) to enhance the flame retardancy of epoxy resin (EP). Characterization of the prepared DIA@PEGP utilized scanning electron microscopy with energy-dispersive x-ray spectrometry and Fourier transform infrared spectroscopy. The resulting EP composite, DIA@PEGP-4/EP, achieved a limiting oxygen index of 33.2% and achieved a V-0 level in vertical combustion tests. Compared to EP, DIA@PEGP-4/EP demonstrated significantly improved fire performance, with 38.6%, 47.8%, 25.0%, 41.3%, and 60.4% reduction in peak heat release rate, total heat release, peak smoke production rate, total smoke production, and CO yield. Furthermore, the highest FPI value of 0.080 m2·s/kW for DIA@PEGP-1/EP and the lowest FGI value of 8.734 kW/m2·s for DIA@PEGP-4/EP, indicate that the incorporation of DIA@PEGP into EP enhances its fire safety. The flame retardancy mechanism of DIA@PEGP-4 involves the formation of a phosphorus-containing aromatic carbon layer during EP char formation, capturing radicals in the gas phase during combustion.
- Subjects
FIRE prevention; DIATOMACEOUS earth; EPOXY resins; HEAT release rates; FIREPROOFING; COMBUSTION gases; SMOKE; ENTHALPY
- Publication
Journal of Applied Polymer Science, 2024, Vol 141, Issue 14, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.55196