Abstract
Polylactic acid (PLA)-based nanocomposites were prepared by twin-screw extrusion. Graphene oxide (GO) and an ionic liquid (IL) were used as additives separately and simultaneously. The characterization of the samples was carried out by means of Fourier transform infrared (FT-IR) and Raman spectroscopies, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The viscoelastic behavior was determined using dynamic mechanical analysis (DMA) and rheological measurements. IL acted as internal lubricant increasing the mobility of PLA chains in the solid and rubbery states; however, the effect was less dominant when the composites were melted. When GO and IL were included, the viscosity of the nanocomposites at high temperatures presented a quasi-Newtonian behavior and, therefore, the processability of PLA was highly improved.
Highlights
Nanocomposites Modified by Despite the increasing number of plastic appliances which are reused or recycled, massive quantities of plastic are accumulated in landfills
The results presented in this work highlight the effect of ionic liquid and Graphene oxide (GO) on PLAderivatives and may present a promising alternative for the development of biodegradable composites
We have prepared a series of Polylactic acid (PLA)-derivatives with graphene oxide, the ionic liquid [Bmpyr]PF6, or both
Summary
Nanocomposites Modified by Despite the increasing number of plastic appliances which are reused or recycled, massive quantities of plastic are accumulated in landfills. This final disposal option is causing major problems in the environment because plastics accumulate in seas and oceans. Polylactic acid (PLA) is an aliphatic polyester which is synthesized by condensation of lactic acid. This material is a bio-based thermoplastic which is biodegradable and biocompatible due to its low toxicity [5,6,7]. Different types of additives are commonly used to improve the properties of PLA [13,14,15,16]
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