Abstract
In order to know the difference in the diffusion behaviour of dye molecules in porous and less porous polymer substrates, investigations were carried out by two different ways; i) Sorption rates of p-aminoazobenzene (p-AAB) on porous acrylic fibers Aqualon WM1 and less porous acrylic fibers Acryl RK1 from the aqueous solution were measured in the range of 65 to 100°C, and ii) the change of diffusion profile of p-AAB in porous and less porous polyacrylonitrile (PAN) membrane assemblies was examined at 60, 70 and 80°C as a function of diffusion time.
From the evaluation of these data, it was proved that for the porous PAN substrates, the dye molecules diffuse rapidly through pore liquid and simultaneously in the polymer matrix with slow rate, while for the less porous substrates only the slow diffusion can take place exclusively in the polymer matrix.
