期刊
POLYMER DEGRADATION AND STABILITY
卷 94, 期 11, 页码 2042-2054出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2009.07.013
关键词
Nanocomposites; Layered double hydroxides; Polypropylene; Cone calorimetry
A series of five oleate-containing layered double hydroxides with varied ratios of zinc to magnesium, i.e., with the general formula Zn2-yMgyAl(OH)(6) [CH3(CH2)(7)CH=CH(CH2)(7)COO]center dot nH(2)O, were synthesized and used to prepare nanocomposites of polypropylene (PP). The nanomaterials were characterized by elemental analysis, attenuated total reflection-infrared spectroscopy (ATR-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA), while the composites were characterized by XRD, TGA, transmission electron microscopy (TEM) and cone calorimetry. The zinc-containing LDH showed better dispersion in the polymer at the micrometer level than did the magnesium-containing LDH while both are equally well-dispersed at the nanometer level. The magnesium-containing composites led to more thermally stable systems in TGA experiments, while the zinc systems gave greater reductions in heat release rate during combustion. Dispersion was also affected by the amount of PP-g-MA which was present. More PP-g-MA gave better dispersion and a significantly reduced peak heat release rate, i.e., enhanced fire performance. (C) 2009 Elsevier Ltd. All rights reserved.
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