Journal
POLYMER DEGRADATION AND STABILITY
Volume 117, Issue -, Pages 22-29Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.03.016
Keywords
Expanded graphite; Flame retardant; Mechanisms; Polymer; Epoxy resin
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Funding
- National Research Fund, Luxembourg [AFR-2953410]
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In this study, expanded graphite (EG) was investigated as flame retardant for epoxy resin based on DGEBA. Various amounts of EG (up to 50 wt%) were incorporated into the epoxy and the composites were studied using X-ray diffractometer, scanning electronic microscopy, cone calorimeter, pyrolysis-combustion flow calorimeter, thermogravimetric analysis, instrumented epiradiator and laser-flash method. Quite unexpectedly, EG leads to a significant increase in pHRR in cone calorimeter tests. Nevertheless, EG also allows delaying strongly the time-to-ignition. Such behavior was assigned mainly to the increase in thermal diffusivity which allows transferring heat faster from the surface to the bulk. (c) 2015 Elsevier Ltd. All rights reserved.
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