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120o was obtained at SiO2 nanoparticle concentration (4%). WVP results revealed remarkable sharp decline in WVP of coated paper compared with uncoated one with increasing coating thickness beyond ( 4% ) SiO2 nanoparticle content attained WVP (0.0003 g Pa-1 s-1 m-1) compared with uncoated sample (0.0126 g Pa-1 s-1 m-1 ). The sorption isotherm of PS/ silica nanocomposite coated paper results have been fitted using BET model. The curves exhibited the characteristic sigmoid-shaped type II isotherm. The monolayer water content values (M0) range between 0.00005 - 0.00280 g water/g dry film. The applied PS/silica nanocomposite on mechanical properties showed enhancement in each of burst, short span, tensile strength. However, roughness and elongation decreased further than (4%) SiO2 nanoparticle content.]]>
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