Influence of lignin type on the characterization of natural fiber polymer composites

Authors

DOI:

https://doi.org/10.5902/2179460X68827

Keywords:

Lignin, Natural fibers, Post-consumer packaging

Abstract

The use of recycled raw materials and renewable sources are necessary for economical, social, environmental and technological development. In this context, this work aims to study the influence of two lignin types, one derived from pine (Lig I) and the other one from eucalyptus, (Lig II) on polymer composites properties of recycled low density polyethylene (r-LDPE-Al) and Pinus Elliotti wood flour (WF), in the proportion 70% and 30% matrix/reinforcement in weight, respectively. The r-LDPE-Al is from Tetra Pak post-consumer packaging. The composites were processed by extrusion in a laboratory co-rotation twin-screw extruder. The composites obtained were evaluated through tests of melt flow index (MFI), tensile strength, Charpy impact strength, density and heat deflection temperature (HDT). The MFI results indicated that both lignin showed potential use as a flow agent for r-LDPE-AL/WF composites, with an increase of  41% and 13% for Lig I and Lig II, respectively, when compared with composite reference 0 (without lignin). Mechanical test results showed that the lignin origin influences the composites’ properties where Lig I, is derived from pine (the same source as wood flour) had the best performance, indicating a potential use as a coupling agent. The results were favorable for a more noble reuse for post-consumer packaging and the lignin by-product.

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Author Biographies

Ana Miyuki Sasamori, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS

Chemical Industrial Engineer with a postgraduate degree in Production and Services Engineering.

Pamela Galera Prestes Pires, Artecola Química, Campo Bom, RS

Master's in Materials Science and Bachelor in Chemistry

Alessandra Luiza de Lemos, Artecola Química, Campo Bom, RS

PhD in Materials Science and Technology, Master's in Engineering, in the area of ​​Materials Technology and Industrial Processes and Chemical Engineer

Ruth Marlene Campomanes Santana, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS

Chemical Engineer, with Master's and Phd at UNICAMP, Post-doctorate at PPGCEM at UFSCar. Currently is a professor at the Materials Department at the Federal University of Rio Grande do Sul, UFRGS/RS.

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Published

2022-04-04 — Updated on 2022-04-18

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How to Cite

Sasamori, A. M., Pires, P. G. P., Lemos, A. L. de, & Santana, R. M. C. (2022). Influence of lignin type on the characterization of natural fiber polymer composites. Ciência E Natura, 44, e14. https://doi.org/10.5902/2179460X68827 (Original work published April 4, 2022)

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Special Edition