Carrier Dyeing of Polyester Fibre Part III – The Role of Water in Solvent Dyeing

Abstract

E E 0.4--0 > W % 0.3f 9, 0.2 0 V n I ) The role of water as an auxiliary in solvent dyeing of polyester fibre has been studied. The addition of water results in a lowering of the glass transition temperature, an increase in the diffusion coefficient and reductions in the energy of activation of diffusion and the entropy of activation of diffusion. The increase in the diffusion coefficient is smaller at higher temperatures and varies from dye to dye, being related to the energy of activation of diffusion. These effects are similar to those reported previously for carriers in the aqueous dyeing ofpolyester fibre and demonstrate that the role of water in solvent dyeing is similar to that of a carrier in aqueous dyeing. 0.1

The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes: Part 2. Analysis of conventional models of dye adsorption

“…As to the likely mechanism by which trichlorobenzene and benzoic acid exerted their impressive promotional effects upon the diffusivity of the six dyes disperse dyes depicted in Figure 47, of the various theories that have been proposed to explain the manner by which dyeing accelerants promote disperse dye uptake on polyester fibres at $95 -100 C (see the literature 20,21,249,[251][252][253] and the references in Burkinshaw 20 and Peters 21 ), it is generally accepted that the typically small molecular size, low solubility, organic compounds act as fibre plasticisers. 153,233,244,248,249,251,252,260,266,267 However, as discussed in Section 8.3.2, evidence suggests that carrier-induced increased dye solubility may augment such carrier-induced plasticisation.…”