Abstract
To improve the water resistance of the polysiloxane layer at the silica/resin interface, a mixture of 3-methacryloyloxypropyltrimethoxysilane (3-MPS) and novel silane coupling agent (MAnbF, n=5, 7, 9, 11) with a hydrophobic fluoroalkyl and a methacryloyl group, such as 3- { [1' - (perfluoro-5-methylhexyl) methyl-2' - (methacryloyloxy)] ethoxy} propyltrimethoxysilane (MA 7 bF) were used. The concentration of each silane solution was adjusted with ethanol at 2 mass%, at various weight ratios of MAnbF 10, 20, 30, 50, 70, or 100% to 3-MPS. The tensile bond strength of the resin composites and the contact angles of a resin monomer mixture (50% Bis-GMA, 50% TEGDMA) to glass plates modified with each silane were measured. MA 5 bF formed a coupling layer with high bond strength and water resistance at the silica/ resin interface at all concentrations studied and MA 7 bF, MA 9 bF and MA 11 bF formed these at concentrations within 10〜30%.
