NR does not show an evident effect on the Tg of PLA, being
consistent with that on Mn shown in Fig. 5a.
The cold crystallization temperature (Tc) obtained from the
second heating scan is found to be a linear reduction with
increasing hydrolysis time (Fig. 7b). The reduction of Tc is
related to the decrease of Mn just like the decrease of Tg.
Compared to neat PLA, the Tc of each PLA/NR blend is lower for
more than 10 C, suggesting that NR affects the crystallization
of PLA.