From second thermogram of each sample the
parameters: glass transition temperature (Tg), specific heat change
(ΔCp), enthalpies of melting (ΔHm) and cold crystallization (ΔHc),
temperatures of cold crystallization (Tc) and melting (Tm) were
determined. The percentage of crystallinity (χc) was calculated by
using Eq. (3), Δ ° Hm is the enthalpy of melting for 100% crystalline
PLA (93.6 J/g)