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Spoliation of fluoroperm rigid gas permeable contact lens by sodium chloride: A positron annihilation study
Author(s) -
Deepa Urs M. V.,
Ranganathaiah C.
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29417
Subject(s) - contact lens , sodium , lens (geology) , contact angle , adhesion , chloride , materials science , sulfonate , polymer , chemistry , chemical engineering , polymer chemistry , composite material , optics , organic chemistry , physics , engineering
The interaction of sodium chloride with Fluoroperm92 contact lens has been investigated using several techniques. Results indicate adhesion of sodium chloride to the methacrylate and fluorine sites of the lens resulting to zones of excess salt concentration. Na + and Cl − ions appear to be pushed toward the polymer by water molecules, which favor the bulk water structures. Further inference is that lens with more free water leads to localized spots of drying resulting to sites for lipid deposition and lens spoilage. The changes in refractive index of the lens due to salt adhesion correlate well with the free volume. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009