Abstract
HEMA (2-hydroxyethyl methacrylate), EGDMA (ethylene glycol dimethacrylate; cross-linker), MMA (methyl methacrylate) and AA (acrylic acid) were copolymerized with ethyl gallate and propyl gallate as additives in the presence of AIBN (2,2'-azobisisobutyronitrile; initiator). The measurement of physical properties of the produced copolymers exhibited that refractive index, water content, visible transmittance, tensile strength, and contact angle were in the range of 1.433�1.435, 38.71�38.99%, 85.4�88.8%, 0.2468�0.2740 kgf and 49.77�36.29 o , respectively. The transmittances of the copolymers were measured to be in the range of 49.0�7.4% and 71.0�43.4% for UV-B and UV-A, respectively, indicating that the copolymers have UV-blocking effect. The produced copolymers containing ethyl gallate and propyl gallate satisfied the basic physical properties required for the fabrication of hydrogel contact lenses. The copolymers showed an increase of wettability and UV- blocking effects while having no significant change in water content compared to the gallate-free copolymers.
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