Dental composites normally use a bifunctional silane coupling agent to provide the interfacial phase that holds together the organic polymer matrix with the reinforcing inorganic phase. In this study the interface was either a silane or a silane coupled with a rubber. Microbond tests were used to measure the interfacial bond strength at the fiber/matrix interface. The interface was varied by silanizing the glass fibers (～30 μm diameter, 8 cm length, MoSci) with various concentrations (1%, 5% and 10%) of either 3-methacryloxypropyltrimethoxy-silane(MPS) or glycidoxypropyltrimethoxysilane (GPS) in acetone (99.8%). Rubber [poly (butadiene/acrylonitrile), amine terminated, molecular weight = 5,500] molecules were also attached to the fiber surface via GPS molecules. The resin was comprised of a 60/40 mixture of Bis-phenol-A bis(2-hydroxypropyl)-methacrylate (BisGMA) and tri (ethylene glycol) dimethacrylate (TEG DMA). The same set of samples were soaked in 50:50 (v/v) mixtures of ethanol/distilled water for a period of one month to detect any change in the interfacial roperties.
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