Abstract
Sulfide-containing monomer, 10-(methylthio)decyl methacrylate(MTD), was utilized for the chemical treatment of various metals to improve the adhesion of resin to them.Three agents for chemical treatments were prepared by dissolving 1mole% of MTD in either MMA, ethanol or 1, 4-dioxane.Various treatments such as(1)polishing and cleaning, (2)MTD treatment, and(3)immersion in water at 60℃ were given to the metals.The tensile adhesive strength between the treated metal and MMA-PMMA/TBBO resin was measured after 2000 times of thermal cycling in water.The contact angle of water on the metal surface was also determined after various treatments.The tensile test revealed that the chemical treatment with MTD improved adhesive strength of resin to noble metal alloys.The contact angle on the metal surface treated with MTD increased by the subsequent treatment(3)except for the Ag alloy, which indicated the desorption of MTD and the lack of long-term stability of adhesion.The adhesive strength was highly correlated to the extent of cohesive failure, but did not depend on the thickness of adhesive resin.These findings suggest that the chemical treatment with MTD is applicable to noble metal alloys to enhance adhesive strength, but that the treatment should be further modified for the long-term durability against water penetration.
