Abstract
Lignins are promising alternative raw materials for biocomposites due to their renewability, low cost and abundance. In this work, the use of (softwood and hardwood) Kraft lignins in the development of LLDPE/lignin films for agricultural mulch applications is studied. Processable blends were obtained from unmodified softwood lignin (SW) and from hardwood lignin modified by esterification (HWE). LLDPE was pelletized with (2.5%, 5% and 10%) lignin with particle size between 38 and 75 μm and flexible films were blown extruded. Processable extrusion blends showed temperature differences lower than 20 °C between the Tg of lignin and the melting temperature of LLPDE. Films from neat LLPDE and with 2.5% of HWE and up to 5% SW exhibited statistically comparable (≅ 349%) values of ductility. Ester groups present in lignin improve weight loss of lignin-based blends after soil buried test.
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Acknowledgements
This research was financially supported by Universidad Tecnológica Nacional (Grant No. PID IPAISF0004433TC and PID IPTUNRE0004309) and CONICET (Grant. No P-UE 2016) from Argentina, and São Paulo Research Foundation—FAPESP. The authors would like to thank to Marcelo Brandolini (INTEC) and Matias Molinaro and Evelin Giampaoli (WINDSA) for the help and support during this research.
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Chiappero, L.R., Bartolomei, S.S., Estenoz, D.A. et al. Lignin-Based Polyethylene Films with Enhanced Thermal, Opacity and Biodegradability Properties for Agricultural Mulch Applications. J Polym Environ 29, 450–459 (2021). https://doi.org/10.1007/s10924-020-01886-6
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DOI: https://doi.org/10.1007/s10924-020-01886-6