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Synthesis and Properties of Siloxane-Containing Hybrid Hydrogels: Optical Transmittance, Oxygen Permeability and Equilibrium Water Content

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Abstract:

Siloxane-containing hybrid hydrogels, coupled with optical transparency and moderate water content, have the advantage of a high oxygen permeability which gives rise to useful characteristics for extended wear contact lenses. To synthesize these hybrid hydrogels, free radical copolymerization of hydrophobic TRIS monomer/PDMS macromer with a hydrophilic monomer in a confined mold was studied. It proved that microphase separation of the resulting hybrid hydrogels, caused by inherent incompatibility between hydrophobic and hydrophilic monomers, could be controlled by either the hydrophobic/hydrophilic balance or molecular weight of PDMS macromer in the formulations, resulting in high optical transmittance (>90%) at 400 nm. The oxygen permeability of the hybrid hydrogels at optimized formulations was also obtained as high as 83 barrers.

Keywords: HYDROGELS; OPTICAL TRANSPARENCY; OXYGEN PERMEABILITY; SILOXANE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2984

Publication date: October 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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