shows the DSC thermograms of all nanocomposites
and of neat PLA, whereas the calorimetric parameters
are summarized in Table 2. All samples are characterized
by a marked exothermic crystallization as confirmation
of the amorphous or low crystalline starting structures.
The glass transition temperature (Tg) and the endothermic
enthalpy of relaxation (DHrel) do not show significant modifications
with nanofiller addition during the first DSC scan.
This phenomenon of enthalpic relaxation is typical for a
polymeric material in the glassy state that undergoes
physical ageing [27,40]. The samples display a similar cold
crystallization temperature (Tc), whereas the nanocomposites
show higher enthalpy of cold crystallization