Journal
POLYMER DEGRADATION AND STABILITY
Volume 82, Issue 2, Pages 325-331Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0141-3910(03)00187-3
Keywords
intumescence; fire retardancy; polypropylene; polyamide-6; ammonium polyphosphate; cone calorimetry; talc and CaCO3
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The effects of fillers (talc and calcium carbonate) were investigated on polypropylene /ammonium polyphosphate/polyamide-6 (PP/APP/PA-6) intumescent system by using mechanical testing, LOI method, cone calorimetry and thermoanalytical techniques. Calcium carbonate and talc affect the fire protective properties of PP/APP/PA-6 system in different ways. It is shown that talc induces an increase in the Young's modulus and a decrease in the elongation at break. Calcium carbonate leads to a decrease in the elongation at break, but there is no improvement in the Young's modulus. Talc increases fire protective performance due to forming a ceramic like protective shield at the surface, whereas calcium carbonate decreases it because of a reaction with APP. Effects of talc and calcium carbonate were furthermore investigated on PP/APP/PA-6 system by measuring Rate of Heat Release (RHR), Total Heat Emitted (THE), CO/CO2 evolution and residual mass. Results are interpreted by means of decomposition, chemical reaction between components and formation of a protective shield at the surface at ignition. (C) 2003 Elsevier Ltd. All rights reserved.
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