Layered double hydroxides composites, thermal

Manzi-Nshuti, C., Wang, D., Hossenlopp, J. M., and Wilkie, C. A. Aluminum-containing layered double hydroxides The thermal, mechanical, and fire properties of (nano)composites of poly(methyl methacrylate), J. Mater. Chem. (2008), 18, 3091-3102. 

B. Ramaraj and K.-R. Yoon, Thermal and physicomechanical properties of ethylene-vinyl acetate copolymer and layered double hydroxide composites. Journal of Applied Polymer Science, 108 (2008), 4090-95. 

The hydroxycarbonate precursors showed dif action patterns consistent with the layered double hydroxide structure proposed for hydrotalcite-like compounds, i.e., brucite-like sheets formed by OH groups and cations (Mg and AP ) in octahedral coordination. Water molecules and charge-compensating COs anions are located in the interlayers. The hydrotalcite-like precursor composition is [Mg,, .Al,(0H)2] (C03), . mH20 with r = Al/(A1+Mg) the stoichiometric hydrotalcite compound, Mg6Al2(0H)i6C03.4H20, is obtained for r = 0.25. Upon thermal decomposition at 673 K, the hydroxycarbonate precursors lose... 

Catalyst synthesis perhaps represents the most promising application of layered double hydroxides [24,46]. The thermal decomposition of LDH carbonates, for example, afford mixed metal oxides that often cannot be prepared by other methods. Several catalytic compositions for organic synthesis [47], methanol synthesis [48] and Fischer-Tropsdi synthesis, for example, [49]... 

C. Manzi-Nshuti, P. Songtipya, E. Manias, M. D. Jimenez-Gasco, J. M. Hossenlopp, and C. A. Wilkie, Polymer nanocomposites using zinc aluminum and magnesium aluminum oleate layered double hydroxides Effects of the polymeric compatibilizer and of composition on the thermal and Are properties of PP/LDH nanocomposites. Polymer Degradation and Stability, 94 (2009), 2042-54. 

A study is reported on the use of layered double hydroxides (LDH) with the hydrotalcite-type structure as fillers of composites and nanocponposites in a polyethylene matrix. The properties of the LDH are first described, as well as then-preparation procedures. Then the most common methods to prepare the composites and nanocomposites are described and discussed and finally the properties of these compounds, which define their apphcations in different fields (e. g., mechanical, thermal, electric, chemical, etc. properties) are discussed. 

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