Abstract:

A family of biodegradable aliphatic-aromatic co-polyesters (BAAC) was prepared by polycondensation in the melt. The synthesis was carried out with the addition of a small amount of alkaline metals salts which produced the effect of a distinctly improved colour of the polyesters as registered in the L*, a*, b* system. The yellow index of the tested samples was calculated from the chromaticity coordinates X, Y, Z. The colour could have been further improved by an exposure to UV radiation. No change was observed in the average molecular mass of the tested co-polyesters as result of the exposure, while an insignificant drop occurred of the inherent viscosity.