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Preparation and Characterization of Silicone Hydrogel Contact Lenses Based on TRIS-HEMA

Authors :

Mahdiyeh Sedghi¹ Hakimeh Ghaleh² Sina Hajibababzadeh³

1- دانشگاه بناب 2- دانشگاه بناب 3- دانشگاه بناب

Keywords :

TRIS،HEMA،silicone hydrogel،contact lens

Abstract :

In this study, silicone-based hydrogel contact lenses were prepared via the free radical polymerization of 3-(methacryloyloxy)propyltris(trimethylsiloxy)silane (TRIS), and 2-hydroxyethylmethacrylate (HEMA) with ethylene glycol dimethacrylate (EGDMA) as the cross-linker and AIBN as the initiator, aiming to enhance the water swelling, wettability and antifouling property. By changing the compositions, the hydrophilicity of the resultant silicone hydrogel lenses can be adjusted. The properties of silicone hydrogel lenses were analyzed such as equilibrium water content, optical transparency, and contact angle. The results showed that the TRIS content in all formulations decreased the equilibrium water content, while HEMA contributed the hydrophilicity of the hydrogels. Water contact angle measurements suggested that the HEMA hydrophilic groups could rearrange on the upper surface of the TRIS containing polymer in the water environment, improving the wettability of the surface. The transmittance of hydrogels contact lenses shows that all hydrogel contact lenses exhibited light transparency in the range 96-97 %.