BISGMA & TEGDMA Form Polymer Matrix of Montmorillonite Nanocomposites


Preparation and characterization of light-cured methacrylate/montmorillonite nanocomposites

Veronica Mucci, Javier Perez, Claudia I Vallo


ABSTRACT

Polymer/clay nanocomposites were prepared from dimethacrylate monomers, commonly used in dental restorative resins, and an organically modified silicate (montmorillonite). The photopolymerization process was hardly affected by the presence of the silicate filler, and thus 2 mm thick samples containing 3 wt% clay were extensively cured. Transmission electron microscopy revealed that the montmorillonite platelets were either intercalated or exfoliated. Nevertheless, for all formulations, intermediate-sized aggregates of about 1 µm were present and their fraction increased as the amount of filler increased. The presence of the clay was found to have no major effect on the flexural modulus and compressive yield strength of the nanocomposites. Moreover, the water uptake of nanocomposites containing 3 wt% clay was about 10–15% higher than that of unfilled monomers. Modification of the clay surface with alternative organic cations is certainly necessary in order to achieve an optimal dispersion of the clay in the polymer matrix.

The methacrylate monomers used for the preparation of the nanocomposites were 2,2-bis[4-(2-methacryloxyethoxy)phenyl]pro-pane  (BisEMA; from Esstech, Essington, PA), triethylene glycoldimethacrylate and 1,6-bis(meth-acrylyloxy-


Article first published online: 14 OCT 2010.  DOI: 10.1002/pi.2935.  Copyright © 2010 Society of Chemical Industry

LINK:  http://onlinelibrary.wiley.com/doi/10.1002/pi.2935/full


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