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KMID : 1159320220240020179
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Korean Journal of Vision Science
2022 Volume.24 No. 2 p.179 ~ p.187
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Physical Properties of Silicone Hydrogel Contact Lens with Chemical Structure of Silicone Monomers
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Jun Jin
Jeong Keun-Seung
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Abstract
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Purpose : The purpose of this research is to investigate the structure of a silicone monomer suitable for fabricating a silicone hydrogel contact lens (SH-CL) in which phase separation does not occur.
Methods : HEMA (2-hydroxyethyl methacrylate) and three silicone monomers, TRIM [3-(trimethoxysilyl)propyl methacrylate, Aldrich], TEMA [2-(trimethylsilyloxy)ethyl methacrylate, TCI], TMMA [(trimethylsilyl)methacrylate, Aldrich] were used to fabricate SH-CL in the cast mold. Physical properties such as water contents, optical transmittance using UV-VIS spectrophotomter, thermal stability through TGA analysis, and chemical properties through FT-IR were investigated.
Results : Using the same amount of silicone monomer, the optical transmittance of SH-CLs were measured to be 92% at TRIM30, 86% at TEMS, and 80% at TMMA, respectively. The water contents showed the highest at 39.3% in SH-CL using TRIM. As a result of FT-IR analysis, it was confirmed that the polymerization reaction between silicone monomer and HEMA was well performed for all three types of SH-CL, and the presence of sol-gel reaction in the TRIM30 lens was confirmed through TGA analysis.
Conclusion : The results represent that TRIM silicone monomer having polar methoxy group is suitable to be used for the preparation of SH-CL since optically transparent with capable sol-gel reaction and increased water contents.
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KEYWORD
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Copolymerization, Phase separation, SH-CL, Sol-gel reaction, Transmittance, Water contents
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