抄録
The effect of pressure on the diffusion coefficient, D, of seven disperse dyes in nylon 6 sheet has been investigated. D was measured at 90°C with the multiple membrane placed in the aqueous solutions of the dyes under pressures up to 3kbar. The values of In D decreased linearly with increasing pressure, from which the activation volume, ΔV_??_, for the diffusion was estimated to be 20.2-33.2cm3/mol for the seven dyes. The ΔV_??_ values were compared with the intrinsic volumes, Vw's, of the dyes. It was found that ΔV_??_ increases almost linearly with increasing Vw for the series of the anthraquinone and azo dyes. It was also found that ΔV_??_for the anthraquinone dye is larger than that for the azo dye if they are compared at the same Vw. These findings are in accordance with those obtained previously for poly (ethylene terephthalate).
The results obtained above were discussed in terms of ΔV_??_EH, ΔV_??_W and ΔV_??_i, where ΔV_??_EH is the volume change on the formation of the Eyring's hole, ΔV_??_W is the change in VW on the activation and ΔV_??_i is the volume change on the activation due to the _??_teraction of the penetrant dye with the surrounding swollen polymer matrix.
