Journal
ACS BIOMATERIALS SCIENCE & ENGINEERING
Volume 2, Issue 11, Pages 2072-2079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.6b00484
Keywords
ophthalmic prosthesis; contact lens; cellulose nanocrystals; biocompatibility; poly(vinyl alcohol)
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Funding
- Wallenberg Wood Science Center
- Knut and Alice Wallenberg Foundation
- Vinnova grant [2013-04645]
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A nanocellulose-reinforced poly(vinyl alcohol) hydrogel material of exceptionally high water content for ophthalmic applications is presented (>90 wt %), which also features a hitherto unprecedented combination of optical, mechanical, viscoelastic, oxygen permeability, and biocompatibility properties. The hydrogel combines the desired softness with remarkable strain-dependent mechanical strength and thereby demonstrates hyperelastic, rubber-like mechanical properties. The observed unusual mechanical behavior is due to both high water content and the combination of relatively stiff cellulose nanowhiskers entangled in a soft polymer matrix of poly(vinyl alcohol) (PVA), thus mimicking the structural characteristics of the cornea's main constituents, i.e., water and collagen.
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