Department of Coatings and Polymeric Materials, North Dakota State University, 1735 NDSU Research Park Drive, Fargo, ND 58105 USA

Glycidyl carbamate (GC) functional resins are unique systems which combine epoxy crosslinking with polyurethane performance. GC functional resins can self-crosslink at elevated temperatures or crosslink with amines at ambient temperatures. It is possible to synthesize a variety of GC functional resins, leading to the ability to tune the properties over a wide range. Hybrid sol-gel coatings contain inorganic domains covalentally attached to the matrix resin. We have explored two approaches for the synthesis of hybrid coating systems based on glycidyl carbamate resins. In the first approach, a multifunctional GC resin is reacted with an aminoalkyl silane, amine crosslinker, and tetraethylortho silicate to form a crosslinked sol-gel hybrid coating. In the second approach, a silane-modified GC resin is first synthesized which has both GC functional groups and silane functional groups. These resins are then crosslinked using a combination of an amine crosslinker and tetraethylortho silicate. With both approaches a large number of compositions have been systematically prepared, key coatings properties determined, and structure-property relationships determined. The coatings have good hardness, solvent resistance, and good adhesion to aircraft aluminum.