2016 Volume 42 Issue 2 Pages 68-75
A ternary component coating comprising a blend of water, glycerol (GL) and poly(vinyl alcohol) (PVA) was prepared, and activity curves and drying rate curves of the coating were measured for different blend ratios of GL and PVA. The coating was found to behave as a pseudo-binary component coating. A set of equations for the drying model of the pseudo-binary component coating was derived from an extended Maxwell–Stefan equation of the ternary component coating, assuming the polymer to be a chain of the same diffusion segment and the Maxwell–Stefan binary diffusivity between PVA and GL to be zero. A series of computer simulations based on the drying model was performed in which molecular mass of the diffusion segment was set 1.0–2.0 times that of the structural segment of PVA. The simulated result showed good agreement with the experimental one, in which drying is controlled by Fick-type diffusion.
