Preparation and Characterization of Polylactic Acid Diol/Graphene Composites
The polylactic acid diols were synthesized by ring-opening polymerization of biodegradable propylene glycol esters with 1,4-butanediol chain transfer agent in the presence of stannous octanoate catalyst.Poly(lactic acid)diol/graphene oxide(PLA-OH/GO)composites were prepared by melt blending using the prepared polylactic acid diols and graphene oxide materials.These materials were tested by Fourier transform infrared spectroscopy,nuclear magnetic resonance,gel permeation chromatography,thermogravimetric analysis,and differential scanning calorimetry.Fourier transform infrared spectroscopy and nuclear magnetic resonance results show that the polymer structures are compatible with the designed molecular structures.The gel permeation chromatography results show that the molecular weights of the polymers have a certain polydispersity with polydispersity indexes of about 1.3.The thermal property results show that the polymer glass transition temperatures are lower than room temperature,which makes the polylactic acid diols have a wider range of applications at lower temperatures.The initial thermal decomposition temperatures of polylactic acid diols are about 250℃,which is sufficient for polymer synthesis and processing techniques.
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