Abstract
Hyperbranched poly(amidoamine)-grafted silicas having terminal boron trifluoride groups (Silica-PAMAM:BF3) were prepared by the treatment of terminal amino groups of the hyperbranched PAMAM-grafted silica with boron trifluoride diethyl ether complex. Silica-PAMAM:BF3 has an ability to cure epoxy rein to give a novel epoxy resin/silica nanocomposite. It was observed that after the curing by Silica-PAMAM, the absorbance of amino groups decreased. It was confirmed by AFM that PAMAM-grafted silica nanoparticles were uniformly dispersed in the cured epoxy resin matrix. The thermal stability and glass-transition temperature of the epoxy resin/silica nanocomposite were considerably higher than those using ethylenediamine (EDA) as a curing agent in the presence of untreated silica. The storage modulus of the epoxy resin/silica nanocomposite in rubbery region increased and the peak area of tanδ curve at glass-transition region decreased in comparison with epoxy resin cured by EDA in the presence of untreated silica. In addition, the glass-transition temperature increased with increasing content of Silica-PAMAM:BF3. The epoxy resin/silica nanocomposite was found to show higher adhesive strength between aluminum plates. Based on the above results, it is expected that silica nanoparticles are incorporated uniformly with chemical bonds in the continuous epoxy resin network.
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