Polyitaconic Acid Macromolecule Primer for Adhesive Bonding and Corrosion Control of Aluminum

摘要

When polyitaconic acid (PIA) macromolecules are applied as water-soluble primers in polyurethane (PU) adhesive/aluminum adherend joint systems, they interact preferentially with the hydrated oxide aluminum to form hydrogen bonds, and with the isocyanate groups in the adhesive to yield polymer-to-polymer chemical bonding. This chemical coupling between the adhesive and adherend acts significantly to promote interfacial adhesive bonds. The arrangement of a near monolayer of PIA intermediate film plays a key role in governing the adhesion durability of the joint system and the corrosion resistance of the aluminum upon exposure to corrosive fluids. The bond stability and the corrosion resistance are due primarily to the formation of interfacial reaction products which are less susceptible to hydrolysis. (ERA citation 12:043517)