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Study of the degradation of fire-retarded PP/PE copolymers using DTA/TGA coupled with FTIR

Abstract : A PP/PE copolymer was successively flame retarded using Mg(OH)2, then using brominated trimethylphenyl indane associated with Sb2O3 (Br/Sb), and finally using blends of equal weights of this last combination with Mg(OH)2 or talc-containing non-hydrated fillers. Decompositions of pure and additive-containing copolymer were studied by DTA/TGA coupled with FTIR. A good correlation exists between the maxima of Gram–Schmidt curves and the derivatives of TGA curves. The coupling of techniques shows that the incorporation of the Br/Sb flame retardant limits strong exothermic phenomena due to sample ignition. In the case of Mg(OH)2 associated with Br/Sb, the decomposition of the hydrated mineral occurs at a lower temperature than the reaction between brominated trimethylphenyl indane and Sb2O3. This delays the action of Br/Sb flame retardant towards higher temperatures, improving the thermal stability of the polymer. A good agreement is also found between DTA/TGA-FTIR conclusions and fire resistance tests carried out on standardized samples. When magnesium hydroxide is replaced by the fillers, the interest in using a pure talc, which appeared in fire resistance tests, is not strongly confirmed by DTA/TGA-FTIR. This discrepancy may be ascribed to the reduced influence of mass diffusion phenomena due to the small weight of the sample used in thermal analysis experiments.
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Submitted on : Wednesday, June 9, 2021 - 10:39:25 AM
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J.-P Gibert, J. Lopez-Cuesta, A Crespy, Anne Bergeret. Study of the degradation of fire-retarded PP/PE copolymers using DTA/TGA coupled with FTIR. Polymer Degradation and Stability, Elsevier, 2000, 67 (3), pp.437-447. ⟨10.1016/S0141-3910(99)00142-1⟩. ⟨hal-03254691⟩

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