Journal
POLYMER DEGRADATION AND STABILITY
Volume 94, Issue 1, Pages 102-106Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2008.10.005
Keywords
Flame retardance; Cone calorimetry; LOI; Benzoxazine; Epoxy
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The combustion behaviour of phosphorus- and silicon-containing benzoxazine-epoxy systems has been studied by LOI and cone calorimetry giving clear evidence that incorporation of 3.5% P into the benzoxazine-epoxy systems resulted in flame retardation while the silicon-containing copolymer was found to have no improvement in the LOI and cone calorimeter data, with values similar to the polymers without heteroatom, thus indicating that the 3.9% silicon content has no flame retarding effect. The peak heat release rate is reduced significantly for the phosphorus-containing benzoxazine as a result of a combination of condensed-phase and gas-phase mechanisms. The incorporation of phosphorus or silicon into the modified benzoxazine-epoxy system increases the smoke hazard and the CO emissions compared to the heteroatom-free system. (C) 2008 Elsevier Ltd. All rights reserved.
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