期刊
POLYMER DEGRADATION AND STABILITY
卷 97, 期 11, 页码 2217-2230出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2012.08.004
关键词
Polyamide 6; Flame retardancy; Aluminum phosphinate; Melamine polyphosphate; Nanocomposite; Solid state NMR
资金
- European project STREP FP-6 PredFire-Nano 'Predicting Fire Behaviour of Nanocomposites from Intrinsic Properties' [STREP 013998]
The aim of this article is to investigate the thermal decomposition in pyrolytic and oxidative conditions of a phosphorous flame retardant (combination of melamine polyphosphate and aluminum phosphinate: AlPi-MPP) alone as well as in combination with an organo-modified clay (o-MMT) and of polyamide 6 formulations containing these additives. The gases evolved during the decomposition have been analyzed using TGA-FTIR. A detailed condensed phase study has been carried out combining X-ray diffraction (XRD) analyses and Al-27, P-31 and C-13 solid-state nuclear magnetic resonance (NMR) measurements on samples heat treated at different characteristic temperatures. It is demonstrated that no reaction leading to the formation of new species between the additives or the additives and the matrix occurs. However, Lewis acid/base interactions are highlighted resulting in the catalytic decomposition of the components particularly under nitrogen. Under air, the combined action of oxygen and Lewis interactions leads to an even more catalyzed decomposition process. Mechanisms of thermal decomposition are proposed. (C) 2012 Elsevier Ltd. All rights reserved.
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