Hybrid nanocomposite film with enhanced moisture barrier properties
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
83
Pages
168-173
Date Issued
2018
Author(s)
Abstract
In this study, hybrid nanocomposite films were prepared by a sol-gel method. Al2O3 particles of 100 nm diameter were mixed with small SiO2 nanoparticles of 10 nm in a coating solution. After coating onto a plastic sheet, the water vapor transmittance rate (WVTR) was reduced from 12.2 to 0.15 g m−2 day−1. However, due to the particle aggregation in the Al2O3/SiO2 system, pore size of the barrier coating remained constant despite the Al2O3/SiO2 ratio. To avoid particle aggregation and to reduce the WVTR, vanadium oxide was added in the coating solution to suppress the aggregation of nanofillers via dehydroxylation. From BET analysis, the addition of vanadium oxide resulted in a smaller pore size to further inhibit water vapor penetration. The WVTR was lowered to 0.095 g m−2 day−1 at a relative humidity of 100%, corresponding to an improvement of 99.2% compared to that of the pristine PET.
SDGs
Type
journal article