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Chemists have studied improvements in the hydrophobic, smoothing and barrier properties of cellulose nanogenic fiber films through sol-gel coatings.
Cellulose nanogenic fiber monofilms on plastic carriers are coated with inorganic-organic co-property sol-gel coatings, inorganic-organic co-property consisting of inorganic Si-O-Si-based networks and ceramic (Al-O-and Zr-O-)-based groups and special organic fluorine-based chains containing official groups.
-gel coating reduces surface hydro hydrogenicity and water vapor through rate
. The water contact angle of the uncooled film is 24 degrees, indicating a high affinity between water and cellulose nanogenic fibers. All tested sol-gel coatings improve surface hydrophobicity with contact angles ranging from 54 to 102 degrees. The water vapor pass rate changes between 230 and 410g / m2 / day.
vapor pass rate is reduced
compared to uncoated films, water vapor pass rate is reduced by 77% compared to highly organic cross-linked coatings that can be cured by ultraviolet light. The oxygen permeation rate of the uncooled membrane at 50% and 80% RH is 0.7 and 107cc / m 2 / day, respectively. At high humidity, the film tends to swell, so permeability increases. Sol-gel coatings significantly improve aerobic performance, especially at 80% RH. Transfer rates vary between 0.4 to 0.5 cc / m 2 / day (50%RH) and between 51 to 86 cc / m 2 / day (80%RH).
the study has been published in the Journal of Coating Technology and Research Volume 17 (2020).
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