Kraft lignin as filler in PLA to improve ductility and thermal properties
By Oihana Gordobil, R. Delucis, I. Egüés, J. Labidi. 2015
263 citations recorded by the source corpus.
Abstract Kraft lignin (KL) and acetylated Kraft lignin (AKL) were used as filler for the elaboration of composites with poly(lactic acid) (PLA) in different concentrations (0.5, 1, 5, 10 and 20%) by extrusion method at 200 °C. Characterization of both lignins has been performed using HPLC, FT-IR, GPC, DSC and TGA. KL presented only 0.3% of ash content and molecular weight around 2000 g/mol. The esterification increased the molecular weight and decreases the polydispersity of the lignin (AKL). Also, AKL had lower Tg and higher thermal stability than unmodified Kraft lignin. Lignin content increased the thermal stability of PLA, with the addition of both types of lignins. Contact angle was measured to assess the change in the hydrophobicity of PLA with the addition of lignins. Mechanical properties of different materials were also investigated in order to know the effect of lignin addition in PLA. Maximum strength was not severely affected at low concentrations of both lignins, but it decreased dramatically, especially in composites with 10 and 20% of KL. Elongation at break increased with the addition of low contents of AKL, at high content of both lignins the material becomes quite brittle.
Subfields: Biomaterials, Biomedical Engineering
View Paper: https://www.semanticscholar.org/paper/110c7f7c8b7b9f4c6e7d5cde5f88508a6fa66f22
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In Biomaterials
In Biomedical Engineering
Citations in the corpus
- Comparison of the Physicochemical Properties and Thermal Stability of Organosolv and Kraft Lignins from Hardwood and Softwood Biomass for Their Potential Valorization (2020, background): “Meanwhile, the signal of aromatic C–H out-of-plane deformation of S units appears at 825 cm−1 for both lignins issued from eucalyptus and at 819 cm−1 for Aleppo pine lignins [44].”