Dihydroxyaluminum Carboxylate Nanoparticles With Narrow Size Distribution: Synthesis, Characterization and Use for High Optical Transparency Protective Polymeric Coatings
✍ Scribed by Hazem Khalil; Hans-Jürgen Gläsel; Luise Wennrich; Andrea Prager; Michael R. Buchmeiser
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 332 KB
- Volume
- 295
- Category
- Article
- ISSN
- 1438-7492
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✦ Synopsis
Abstract
Nano‐sized bis(dihydroxyaluminum)maleate particles (ALMAL) were prepared via a high‐temperature precipitation reaction from different Al‐alkoxides and maleic acid in different solvents. Variations in the reactants were carried out to identify the optimum reaction conditions that lead to particles <30 nm in diameter with narrow particle size distributions and without formation of a secondary amorphous phase. A disc centrifuge was used to characterize the particles in terms of particle size distribution. ALMAL‐containing, epoxy‐based nanocomposites were prepared with ALMAL‐loadings up to 30 wt.‐% and thermally cured. The cured coatings possessed excellent scratch and abrasion resistance, surface hardness and were highly transparent (T>95%). In order to study the effect of the nature of nanoparticles on the final properties of the coatings, aluminum malate (ALMALAT), and aluminum terephthalate (ALTEREPHTHAL) nanoparticles as well as the corresponding composite coatings were prepared and characterized. For comparison, surface‐modified silica nanoparticles were used to evaluate the mechanical and optical behavior of the produced nanocomposite coatings.
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