Nonisothermal crystallization behavior of polylactide/polyethylene glycol/graphene oxide nanosheets composite films

The nonisothermal crystallization (NIC) behavior of solution-cast polylactide (PLA)/polyethylene glycol (PEG)/graphene oxide (GO) nanosheets composite (PLA/PEG/GO) films was examined at the selected cooling rate. The crystallization temperature (T) of the PLA/PEG matrix improved with increasing the reinforcement of GO (0.5%-2% w/w) at a constant cooling rate. Various conventional crystallization models, namely, Jeziorny, Ozawa, and Mo were employed to elucidate the NIC kinetics of the PLA/PEG/GO composite films. Results showed that the Mo equation was the best model to describe the NIC of the nanocomposite films. The activation energy (E) of crystallization was estimated by Friedman's method, and the values varied from 18 to 186 kJ·mol, however, the values were not systematic with the loading concentration of GO.