Glass transition temperatures, obtained from the midpoint of the typical heat capacity change observed in the second DSC heating scans, were determined in awide range of moisture content for the three CO levels considered in this work.
In most cases reproducibility of the tests was good with variation coefficients lower than 10%. The main mechanical relaxation temperatures (T˛), on the other hand, were obtained for the different combinations of CS–CO blends analyzed, by DMTA. This temperature, which is normally associated with the mechanical manifestation of the glass
transition temperature of the material Tg, was determined from the drop in the storage modulus E, from the peaks in loss modulus E and in tan ı (see Fig. 3b).
From all these measurements, those obtained from the drop in E were, however, more reproducible in
most cases. These were taken for further discussion in this work.