ABSTRACT:The effect of temperature on the dyeing rate constant k, diffusion coefficient D, time of half-dyeing t 1/2 was evaluated for the dyeing of polyester fibers with two disperse dyes, an azo and an anthraquinone dye. Activation energies of diffusion E were calculated. The polyester dyeing equilibrium was also studied and the partition coefficient K and standard affinity ⌬°at various temperatures were determined for the anthraquinone dye. Standard enthalpy ⌬H°and standard entropy ⌬S°of dyeing were also obtained. The same equilibrium parameters were not obtained for the azo dye because of its dyeing behavior. A similar kinetic and equilibrium study was made for the pure azo and anthraquinone compounds free from the dispersing agents present in the commercial dyes and the results are discussed.
New poly[(amino)amide]s (4) deriving from 1,2,4,5-benzenetetraamine and terephthalic, isophthalic, or 2,5-furandicarboxylic acid (2ac) were indirectly prepared by detosylation of the corresponding new poly[(tosylamino)amide]s 3, which were obtained by low-temperature solution polymerization of 4,6-ditosylamino-l,3-phenylenediamine (1) with the dicarboxylic acid dichlorides 2a-c. In a subsequent step the poly[(amino)amide]s were converted by polydehydrocyclocondensation into the heat-resistant aromatic poly(imidazo[4,5-flbenzimidazole)s (5) by heating in a high vacuum. The results of elemental analysis, IR and UV spectroscopy, inherent viscosity measurements, molecular weight determination (osmometry), and thermal analysis (DSC, TG) of the prepared polymers are compared and discussed.
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