Synthesis of polylactic acid by the solid-state polycondensation of oligomers. Effect of the nanosized boron filler on the final properties of the polymerстатья
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Аннотация:A method developed for producing composites based on polylactic acid (PLA) and elemental boron nanoparticles by the method of solid-state polycondensation is presented. The synthesis parameters (time, temperature, and residual pressure) were optimized to obtain PLA with desired properties. The influence of the nanosized boron filler was evaluated. When boron nanoparticles are added in an amount of 0.03 wt.%, the properties of PLA change: the degree of crystallinity increases by 20% compared to the polymer without additives and an increase in the molecular weight of the polymer up to 60 kDa is observed. The properties of the solid-state polycondensation products were studied by NMR spectroscopy, X-ray phase analysis, gel-permeation chromatography, and differential scanning calorimetry.
