Promotion of Adhesion Between Resin and Silica-coated Titanium by Silane Monomers and Formic Acid Catalyst

Abstract

Three bifunctional silane coupling agent monomers and their blends with a cross-linking silane were investigated as six experimental adhesion-promoters in vitro. Three organosilane monomers, 3-methacryloxypropyltrimethoxysilane, styrylethyltrimethoxysilane, and 3-(N-allylamino)propyltrimethoxysilane, were prepared as 1% (v/v) primers and also blended with a cross-linking silane, 1,2-bis-(triethoxysilyl)ethane at 0.5% (v/v), in a 95:5 solution of ethanol in deionized water. The silanes were allowed to hydrolyze using formic acid as catalyst and were applied to a substrate of silica-coated Ti. The control was a prehydrolyzed silane coupling agent that is commonly used in dentistry. An experimental unfilled bis-phenol-A-diglycidyldimethacrylate/methylmethacrylate resin was bonded by photo-polymerization as stubs to the prepared Ti. Half of the specimens were artificially aged by wet thermocycling and half were stored in dry conditions in a desiccator. Storage conditions and the type of primer silane or blend significantly affected shear bond strength values. 3-Methacryloxypropyltrimethoxysilane, alone or blended, produced significantly higher shear bond strength values than the control, both after dry storage and after thermo-cycling.

Specifics and Methods of Inhibiting the Underfilm Corrosion of Carbon Steel

“…Of the organic compounds used for these purposes, such as organotitanates, organozirconates, benzotriazoles, etc. [ 66 ], the class of organosilicon adhesion promoters, namely organosilanes (or silanes), whose chemical formula is RnSi(OR’) 4−n , is distinguished for its unique properties [ 66 , 67 , 68 , 69 , 70 , 71 ]. The specific feature of these compounds is manifested in the versatility of their promoting effect on substrates and polymers of various types.…”

“…Moreover, preliminary modification (pretreatment) of metal surfaces with organosilanes may not only improve the adhesion of the polymer coating to the metal [ 66 , 67 , 68 , 69 , 70 , 71 ], but also inhibit metal corrosion [ 67 , 68 , 69 ]. In some publications, the option to modify polymer coatings by incorporating organosilanes into their bulk is discussed.…”

Corrosion of Metals Modified with Formulations Based on Organosilanes

“…[16]. Among these, organosilicon adhesion promoters stand out for their unique properties [17][18][19][20][21]. A special feature of these compounds is manifested in the versatility of the promoting effect on substrates and polymers of various types.…”

Effect of metal ions on the anti-corrosion properties of γ-glycidoxypropyltrimethoxysilane coatings on cold-rolled iron

“…The silanol groups and hydroxyl groups form Si-O-M (M is a metal) bonds by dehydration reaction at high temperature to immobilize the SCA coating on metal surface (Bajat et al, 2010;Chen et al, 2010;Valenza et al, 2011). Meanwhile, the silanol groups undergo self-crosslinking to generate a reticular structure of the Si-O-Si bonds covering the metal surface (Chico et al, 2012;Kurayama et al, 2010;Matinlinna et al, 2010). This cross-linked coating then acts as a physical barrier between the metallic substrate and the aggressive environment of outside acid, alkali, salt and so on (Fedel et al, 2009;Li et al, 2008), by reducing the number of pathways which could induce the penetration of aggressive species.…”