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Dihydroxyaluminum Carboxylate Nanoparticles With Narrow Size Distribution: Synthesis, Characterization and Use for High Optical Transparency Protective Polymeric Coatings
Author(s) -
Khalil Hazem,
Gläsel HansJürgen,
Wennrich Luise,
Prager Andrea,
Buchmeiser Michael R.
Publication year - 2010
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200900240
Subject(s) - materials science , nanocomposite , nanoparticle , particle size , composite material , chemical engineering , abrasion (mechanical) , amorphous solid , particle (ecology) , nanotechnology , organic chemistry , chemistry , engineering , oceanography , geology
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.