Abstract
In the previous study it was shown that poly (ethylene terephthalate) (PET) fiber treated with highly concentrated sulfuric acid had good dyeing properties for cationic dyes under normal pressure. Better results were obtained in the present study by treating PET fiber with sulfuric acid of higher concentration;
Sulfation carried out with sulfuric acid of 78% at 80°C for 40min., further improved the dyeing properties and tensile strength of the fiber. Diffusion coefficient of Malachite Green in sulfated PET fiber were also measured. Activation energy of diffusion was calculated and was compared with polyacrylonitrile fiber case.
