The plasticisation model of dye diffusion: Part 9

Abstract Re‐evaluation using the Williams–Landel–Ferry (WLF) equation, of diffusion coefficient and standard affinity data previously reported for five different disperse dyes within/onto three different types of esterified cellulose substrate, reveals that thermally activated dye diffusion/adsorption adheres to a WLF relationship and is therefore governed by the thermally regulated structural relaxation times of the respective water‐saturated, water‐swollen, water‐plasticised cellulose acetate or cellulose triacetate macromolecule over the broad 40°C to ~ 100°C range of dyeing temperatures considered. The plasticisation model of dye diffusion appears to offer a reasonable explanation of the pronounced temperature dependency of the diffusivity of the various disperse dyes within the different types of cellulose ester substrate.