K. Azuta et al., Water and oxygen permeability of silica thin films containing organic polymers coated on poly (ethylene terephtalate) substrate by the sol-gel method, J CERAM S J, 107(3), 1999, pp. 293-296
Silica thin films containing organic polymers, such as poly(vinyl alcohol),
poly(vinylpyrrolidone) or poly(vinyl acetate), were prepared on PET substr
ates by the sol-gel method. Poly(vinyl alcohol) was found to be most effect
ive to suppress the water permeability of PET substrates coated with the or
ganic-inorganic composite films among the three. Under the optimal conditio
n, the water permeability coefficient was about 40% of that of PET substrat
es. The oxygen permeability coefficient was decreased with an increase in t
he poly(vinyl alcohol) content in the composites and was about 10% of that
of PET substrates when a large amount of poly(vinyl alcohol) was included i
n the composites.