Abstract
AbstractThe mechanical performances of fiberglass reinforced plastics (FRP) are quite different when the glass fibers are treated with vinyl (VS) and methacryl (γ‐MPS) functional silane coupling agents. We have studied the structural basis for this difference on the molecular level using Fourier transform infrared spectroscopy (FT‐IR). A high‐surface‐area silica powder is used to study the coupling agent/matrix interface. Both VS and γ‐MPS can react with styrene at the interface. However, when E‐glass fiber is used as a substrate, only γ‐MPS polymerizes in the coupling agent interphase which consists of many layers of coupling agent molecules while the major portion of the VS does not polymerize in the interphase. The effect of glass surfaces, with and without a coupling agent, on the curing of the polyester resin has also been studied. Silane coupling agents participate in the curing of the polyester resin while untreated E‐glass fiber surfaces inhibit the polymerization resulting in different structures from the bulk matrix.
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