Thermal Stability and Decomposition Mechanism of PLA Nanocomposites with Kraft Lignin and Tannin

Polymers

Evangelia Tarani¹  Konstantinos Chrissafis¹  Klementina Pušnik Črešnar²  Lidija Fras Zemljič²  Nina Maria Ainali³  Alexandra Zamboulis³  Dimitrios N. Bikiaris³  Dimitra A. Lambropoulou⁴ 

[1] Department of Physics, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece;Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia;Laboratory of Chemistry and Technology of Polymers and Dyes, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece;Laboratory of Environmental Pollution Control, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece;

关键词: poly(lactic acid);    nanocomposites;    tannin;    lignin;    thermal degradation kinetics;    decomposition mechanism;   

DOI  :  10.3390/polym13162818

来源: DOAJ

【 摘 要 】

Packaging applications cover approximately 40% of the total plastics production, whereas food packaging possesses a high proportion within this context. Due to several environmental concerns, petroleum-based polymers have been shifted to their biobased counterparts. Poly(lactic acid) (PLA) has been proved the most dynamic biobased candidate as a substitute of the conventional polymers. Despite its numerous merits, PLA exhibits some limitations, and thus reinforcing agents are commonly investigated as fillers to ameliorate several characteristics. In the present study, two series of PLA-based nanocomposites filled with biobased kraft-lignin (KL) and tannin (T) in different contents were prepared. A melt–extrusion method was pursued for nanocomposites preparation. The thermal stability of the prepared nanocomposites was examined by Thermogravimetric Analysis, while thermal degradation kinetics was applied to deepen this process. Pyrolysis–Gas Chromatography/Mass Spectrometry was employed to provide more details of the degradation process of PLA filled with the two polyphenolic fillers. It was found that the PLA/lignin nanocomposites show better thermostability than neat PLA, while tannin filler has a small catalytic effect that can reduce the thermal stability of PLA. The calculated Eα value of PLA-T nanocomposite was lower than that of PLA-KL resulting in a substantially higher decomposition rate constant, which accelerate the thermal degradation.

【 授权许可】

Unknown