EFFECT OF SOLVENT ON ACTIVATION VOLUME FOR THE DIFFUSION OF p-AMINOAZOBENZENE IN CELLULOSE DIACETATE FILM

Seta, Jiro; Takeno, Mina; Ito, Taisuke

doi:10.2115/fiber.40.6_t221

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“…15), that both the diffusion coefficient (of p-aminoazobenzene) and its pressure dependence were obtained to be nearly Consistent between the hot benzene-treated sample and the original sample as received. Further, the comparison of the X-ray diffraction photographs [20] of the above two samples showed no positive evidence for the solvent-induced crystallization on the side of the treated sample. The densities at 30 ~ after drying in vacuo at 60 ~ for 48 h were found to be 1.310 and 1.309 g/cm 3 for the hot benzene-treated and the original samples, respectively.…”

Section: Scamentioning

confidence: 87%

Effects of pressure and solvent on the diffusion of aromatic compounds through polymers

Ito

Seta

Urakawa

1987

Colloid & Polymer Sci

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Abstract:The diffusion of six azo and five anthraquinone derivatives through nylon 6, poly(ethylene terephthalate) and secondary cellulose acetate films were studied under high hydrostatic pressures of up to 3000 bar and at temperatures 80-130 ~ by analyzing the diffusion profiles yielded in a stacked multiple film, placed in the solution of the diffusant. It was found that the diffusion coefficient, D, of the diffusant decreased with increasing pressure, giving a linear relationship between In D and the pressure, the slope of which gave the activation volume for the diffusion, A V#. It was revealed zlV~increased linearly with increasing intrinsic molecular volume of the diffusant, Vw, the slopes being different between the azo and the anthraquinone derivatives. The ratio of A V~ to Vw (AV4=/Vw) ranged from 0.13 to 0.93, depending in a sensitive manner on the degree of swelling of the polymer matrix which in turn was varied by the solvent. The overall results could be explained in accordance with the formulation, Vf, local + ZIV~= Vw, where Vf, local represents the free volume contribution. It was proposed that Vw is increased by solvation when the solvent is good for the diffusant.

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Section: Scamentioning

confidence: 87%