Description: NanoSonic has developed a low viscosity, UV curable epoxy technology for fast adhering of optical components to ceramic glass substrates. The aliphatic epoxy adhesive formulations have viscosities <10 Poise and the fully cured networks display glass transition temperatures higher than 70 °C using cationic photo initiation at ambient conditions. The adhesive formulation has successfully demonstrated curing inside of UV-opaque substrates via a dark cure mechanism. Dogbone specimens display tensile strength up to 36 MPa. Aluminum lapshear samples strength shows adhesive failure up to 26 MPa, while no ceramic glass lapshear failed in the bond area. CTE values for unfilled aliphatic epoxies were as low as 40 ppm °C.

Benefits: A low viscosity, UV curable adhesive system that possess high strength, high glass transition temperatures (Tg), and low coefficient of thermal expansion can be used in precise bonding of Laser Interferometer Space Antenna (LISA) and other stable structure applications, as well as encapsulants in electronics and UV-stable coatings.

UV curable epoxy based-precursors and polymers are used as adhesives, UV-stable coatings, encapsulants for electronics, inks, and paints/varnishes applications. The low CTE and dielectric properties make these materials attractive for electronics and specialty application.