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Synergistic effect of boron containing substances on flame retardancy and thermal stability of intumescent polypropylene composites
Date
2010-12-01
Author
Yılmaz, Ayşen
BAYRAMLI, ERDAL
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The synergistic effect of four different boron containing substances, zinc borate (ZnB), borophosphate (BPO4), boron silicon containing preceramic oligomer (BSi) and lanthanum borate (LaB), were studied to improve the flame retardancy of a polypropylene (PP) intumescent system composed of ammonium polyphosphate (APP) and pentaerythritol (PER). The flame retardancy of PP composites was investigated by limiting oxygen index (LOI). UL-94 standard, thermogravimetric analysis (TGA) and cone calorimeter tests. The addition of 20 wt% intumescent flame retardant (IFR) improves the flame retardancy by increasing the char formation. According to LOI and UL-94 test, boron compounds show their highest synergistic effect at I wt% loading. BPO4 containing composite shows the highest LOI (30), lowest maximum heat release rate (HRR) and lowest total heat release rate (THR) value. Although the char yield increases as the amount of boron compounds increases, the flame retarding effect decreases. Cone calorimeter and TGA data indicate that the boron compounds are likely to show their synergistic effect by reinforcing the integrity of char which improves its barrier effect rather than increasing the char yield. (C) 2010 Published by Elsevier Ltd.
Subject Keywords
Intumescent flame retardants
,
Boron compounds
,
Polypropylene
,
Cone calorimeter
URI
https://hdl.handle.net/11511/30546
Journal
POLYMER DEGRADATION AND STABILITY
DOI
https://doi.org/10.1016/j.polymdegradstab.2010.07.033
Collections
Graduate School of Natural and Applied Sciences, Article
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A. Yılmaz and E. BAYRAMLI, “Synergistic effect of boron containing substances on flame retardancy and thermal stability of intumescent polypropylene composites,”
POLYMER DEGRADATION AND STABILITY
, pp. 2584–2588, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30546.