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Abstract
We used quasi-steady shear-rheometry and oscillatory-rheometry measurements to characterise rheological behavior of 5\%-15\% (w/v)} shellac in butanol solutions. A subtle shear-thickening followed by shear-thinning behavior was observed at all shear rates. The shear-dependent moduli $G'$ and $G''$ showed the presence of linear and non-linear viscoelastic regions and were modeled using an elasto-viscoplastic Saramito model, with viscoplastic viscosity modeled using the Herschel-Bulkley model. We applied the Landau-Levich theory to predict shellac coating thickness on paper substrates, with capillary number, viscosity, velocity, strain rate and surface tension as input. The water vapor transmission rate across the coated paper was characterised by Fick's diffusion model, giving an inverse dependence on coating thickness in broad agreement with experimental data.
