The characterisation of dope dyed poly (ethylene terephthalate)

By analysing the polycondensation of ethylene glycol with dimethyl terephthalate, the influence of 1,4‐aminoanthraquinone dyestuffs on the chemical and molecular properties of dope dyed poly(ethylene terephthalate) has been determined. The results show that dope dyed poly(ethylene terephthalate) differs from the uncoloured polymer by a possession of a higher amount of ‐COOH end groups and diethylene glycol units. The shape and the position of molecular weight distribution curves determined by gel permeation chromatography are also influenced by the soluble dyestuffs used.