Abstract
Composite materials have been prepared with up to 50 vol % glass beads in two methacrylate resins: polymethyl methacrylate and 64% bisphenol A di(glycidyl methacrylate) — 36% triethyleneglycoldimethacrylate. These composites were immersed in water at 60° C for up to six months and the changes in weight, elastic modulus and compressive strength were followed. In the polymethyl methacrylate composites the water uptake levels off after 5 days. The strength and modulus decrease over this period due to plasticization of the resin, but then increase again. The cross-linked methacrylate composites show the same decrease but no subsequent increase. Silane treatment of the glass beads reduces the water uptake by the resin and the decrease in modulus and strength.
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