A calorimetric
characterization of these samples revealed a crystallinity degree of
about 30%, which is the maximum reachable for the chosen polymer
[15]. These samples will be referred to as crystalline PLA. A
third sample was prepared by milling the crystalline PLA to
a characteristic dimension of 0.2 mm, so that the effect of geometry
could be assessed. This sample will be referred to as “crystalline
PLA e milled”.