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KMID : 1011420120170020119
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 2 p.119 ~ p.126
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Comparison of Properties of Polymer Based Glass Lenses by Chemical Etching Reaction
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Lee Jung-Hwa
Noh Hye-Ran
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Abstract
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Purpose: To study changes in coating and lens materials after chemically etched different polymer based glass
lenses in short-term and ambient condition using hydrofluoric acid.
Methods: Vinyl ester polymer (Lens A) and thiourethane polymer (Lens B), both dyed in gray 70%, were etched in hydrofluoric acid solution for 5, 10, or 15 min. The mechanical properties, degrees of damages in hard coating, anti-reflection coating, and other coatings, rates of refractive index and light transmission of both polymer types were evaluated.
Results: Rates of refractive index of both lens types were not changed significantly after chemical etching. However, anti-reflection coatings and hard coatings were removed and lens surfaces were damaged. As a results, UV light transmission of lenses increased and mechanical properties decreased. Chemical etching notably changed various properties of thiourethane polymer materials.
Conclusions: Depending on types of polymer materials, chemical reactions by hydrofluoric acid were dissimilar. Thus, various properties of les materials were altered differently.
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KEYWORD
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Glass lens materials, Polymer lens, Lens etching, Polymer corrosion, Coating corrosion
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