THE KINETICS OF DYEING - A NONISOTHERMAL APPROACH

Non-isothermal kinetics can prove to be an effective tool for investig ating exhaustion curves. Applying non-isothermal methods of analysis t o exhaustion data for disperse dyes on polyester, it was shown that th e intimate mechanism cannot be covered by a unique kinetic function, a s the mechanism seems to be composed of several stages, each with its own kinetics. As a consequence, the overall kinetics change with both temperature and heating rate. It is suggested that such an analysis sh ould be performed each time before proposing kinetic functions to fit the experimental data. Nonisothermal kinetic analysis also proves the impossibility of designing temperature-raising programmes that will en sure isoreactive dyeing for a blend of two or more dyes.