Effect of Graphene Nanoplatelets on Crystallization Kinetics of Poly (lactic acid)

Crystallization behavior of nanocomposite based on graphene nanoplatelets have been considered due to its critical effect on performance of the final product. In this study, nanocomposite based on Poly(lactic acid)/graphene nanoplatelets was prepared via solution method. To improve the dispersion of graphene nanoplatelets in the matrix, functionalization using acid treatment and acylation reaction were accomplished. Characterization of functionalization reaction and grafting reaction between Poly(lactic acid) (PLA) and functionalized graphene nanoplatelets was tracked by Fourier Transform Infrared Spectroscopy, Raman, elemental analysis, Fourier transform infrared attenuated total reflection, and thermogravimetry analysis. The results showed that the reaction was successfully performed. Transmission electron microscopy results demonstrated that a relatively fine dispersion of FGNp was achieved in the PLA matrix. Non-isothermal and isothermal crystallization behavior were studied using differential scanning calorimetry. Isothermal kinetic of crystallization was studied by combination of the DSC data and theory of Avrami.