Poly (tetramethylene terephthalate) (4GT)-poly (tetramethylene oxide) (PTMO) block copolymer films were either annealed at various temperatures ranging from 130-190°C or drawn at 25°C with the draw ratios ranging from 1.0-7.0. These films were dyed at 80°C with C. I. Disperse Yellow 7 (Y-7) and p-Aminoazobenzene (PAAB). The equilibrium dye sorption (
Mo) of Y-7 and PAAB by the annealed films increased with an increase in the crystallinity (
Cv).
Mo of Y-7 by the drawn films increased during drawing; similarly the
Cv values of the drawn films slightly increased with draw ratios (λ). The change in
Mo of these disperse dyes was analyzed in terms of the mosaic-block dyeing model by use of fine structural data of the block copolymer films. It was suggested that the change in
Mo with increasing
Cv depended on the dyeability of amorphous side region between the crystalline cores located parallel to the molecular axis. In the case of the drawn films, the increase in
Mo of Y-7 with λ is ascribed to the increase in the fraction of inter-fibrilar tie chains in the side region; these chains would have a strong affinity particularly to a long rodlike dye molecule such as Y-7. The increase in
Ms is probably associated with the orientation of the amorphous chain in the side region.
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