The Tcc of pure PCRPET differs significantly from that of the
active packaging, indicating that the addition of KS induces changes
in the crystalline structure of PCRPET. The solid potassium sorbate
acts as a nucleating agent promoting crystallization. Table 1 shows
no significant difference between DHc
between the samples conaining 2.5 and 4.0 wt.% K S. This is most probably due to the
addictive agglomeration of sorbates at the higher concentration
corroborated by SEM images (Fig. 3 ), which does not result in a
higher level of nucleation.