Radical polymerization of fluoroalkyl 2-fluoroalkoxy methacrylate to new type of fluorine containing polymer

Summary Fluoroalkyl 2-fluoroalkoxymethylacrylates as 1,1-disubstituted ethylenic monomers were synthesized from methyl 2-hydroxymethylacrylate as a starting compound. These monomers readily polymerized to high molecular weight despite considerable steric hindrance expected. Electron withdrawing character of the fluoroalkyl groups rendered these monomers as much stronger electron accepting monomers than methyl methacrylate in copolymerization. The polymers obtained were characterized by thermal stability, glass transition temperature, and contact angle of the polymer film to water.     

Effects of a silane coupling agent on the tensile adhesive strength between resin and titanium

Adhesion of a cured dental opaquer, which masks metallic appearance and color, to sandblasted Ti aided by 3‐methacryloyloxypropyltrimethoxysilane (MPTS) is investigated. The tensile bond strengths of Ti and the opaquer are 43.3 and 45.9 MPa, respectively, when MPTS dissolved in ethanol (6 wt %) and premixed with the opaquer (3 wt %) are applied to the sandblasted Ti surface. Mirror finishing alone and sandblasting alone result in the bond strengths of 1.8 and 21.3 MPa, respectively. After thermal cycling (4 and 60°C for 5000 cycles), the bond strengths of the Ti with sandblasting and the MPTS treatment remain higher than that of the Ti with sandblasting only. Sandblasting and the MPTS treatment effectively promote the adhesion of the opaquer to Ti that rapidly forms an oxide surface layer. The silane‐aided adhesion of the opaquer to the sandblasted Ni? Cr, Co? Cr, and Au? Ag? Pd alloys attain adhesive strengths of 33.2, 31.9, and 31.6 MPa, respectively. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013