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KMID : 1059520090530060749
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Journal of the Korean Chemical Society
2009 Volume.53 No. 6 p.749 ~ p.754
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Study on the Polymerization of Hydrogel Polymer Containing HEMA and Measurement Method of Oxygen Transmissibility
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Kim Tae-Hun
Sung A-Young
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Abstract
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HEMA (2-hydroxyethyl methacrylate) is a hydrophilic material which is broadly used for ophthalmologic purposes and especially in the manufacture of soft contact lenses. Also, the oxygen transmissibility (Dk/t) is a very important physical characteristic in the evaluation of a material’s adequacy to be used to produce contact lenses. This study used HEMA (2-hydroxyethyl methacrylate), MMA (methylmethacrylate), NVP (Nvinyl-pyrrolidone), the cross-linker EGDMA (ethylene glycol dimethacrylate) for copolymerization, and measured the oxygen transmissibility of the central and peripheral areas of the manufactured general and color contact lenses using the polarographic method. The measurement showed that the decreased amount of oxygen transmissibility of the central and peripheral areas of the contact lenses measured using the polarographic method range between 40.77% and 49.13%, and the oxygen transmissibility of the color contact lens showed a larger decrease due to the effects of the coloring materials.
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KEYWORD
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HEMA, Oxygen transmissibility, Ophthalmic material
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