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Title:Kraft lignin/tannin as a potential accelerator of antioxidant and antibacterial properties in an active thermoplastic polyester-based multifunctional material
Authors:ID Pušnik Črešnar, Klementina (Author)
ID Zamboulis, Alexandra (Author)
ID Bikiaris, Dimitrios (Author)
ID Aulova, Alexandra (Author)
ID Fras Zemljič, Lidija (Author)
Files:.pdf Kraft_Lignin_Tannin_as_a_Potentia-Cresnar-2022.pdf (3,87 MB)
MD5: C2A94CE5A61CFA85C422135DBB2E0A39
URL https://www.mdpi.com/2073-4360/14/8/1532
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:This research focuses on key priorities in the field of sustainable plastic composites that will lead to a reduction in CO2 pollution and support the EU’s goal of becoming carbon neutral by 2050. The main challenge is to develop high-performance polyphenol-reinforced thermoplastic composites, where the use of natural fillers replaces the usual chemical additives with non-toxic ones, not only to improve the final performance but also to increase the desired multifunctionalities (structural, antioxidant, and antibacterial). Therefore, poly (lactic acid) (PLA) composites based on Kraft lignin (KL) and tannin (TANN) were investigated. Two series of PLA composites, PLA-KL and PLA-TANN, which contained natural fillers (0.5%, 1.0%, and 2.5% (w/w)) were prepared by hot melt extrusion. The effects of KL and TANN on the PLA matrices were investigated, especially the surface physicochemical properties, mechanical properties, and antioxidant/antimicrobial activity. The surface physicochemical properties were evaluated by measuring the contact angle (CA), roughness, zeta potential, and nanoindentation. The results of the water contact angle showed that neither KL nor TANN caused a significant change in the wettability, but only a slight increase in the hydrophilicity of the PLA composites. The filler loading, the size of the particles with their available functional groups on the surfaces of the PLA composites, and the interaction between the filler and the PLA polymer depend on the roughness and zeta potential behavior of the PLA-KL and PLA-TANN composites and ultimately improve the surface mechanical properties. The antioxidant properties of the PLA-KL and PLA-TANN composites were determined using the DPPH (2,2′-diphenyl-1-picrylhydrazyl) test. The results show an efficient antioxidant behavior of all PLA-KL and PLA-TANN composites, which increases with the filler content. Finally, the KL- and PLA-based TANN have shown resistance to the Gram-negative bacteria, E. coli, but without a correlation trend between polyphenol filler content and structure.
Keywords:poly (lactic acid), Kraft lignin, tannin, multifunctionality of PLA composites, surface mechanical properties, antioxidant/antibacterial activity
Publication status:Published
Publication version:Version of Record
Publication date:01.04.2022
Year of publishing:2022
Number of pages:18 str.
Numbering:Letn. 14, Št. 8, št. članka 1532
PID:20.500.12556/DKUM-85902 New window
ISSN on article:2073-4360
COBISS.SI-ID:104505603 New window
DOI:10.3390/polym14081532 New window
Publication date in DKUM:18.09.2023
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Record is a part of a journal

Shortened title:Polymers
Publisher:Molecular Diversity Preservation International
COBISS.SI-ID:517951257 New window

Document is financed by a project

Funder:Other - Other funder or multiple funders
Project number:OP20.04343

Funder:ARRS - Slovenian Research Agency
Project number:P2-0118
Name:Tekstilna kemija in napredni tekstilni materiali

Funder:ARRS - Slovenian Research Agency
Project number:P2-0264
Name:Trajnostni Polimerni materiali in Tehnologije

Funder:ARRS - Slovenian Research Agency
Project number:J2-9443
Name:Reološko obnašanje in mehanske lastnosti pri procesiranju polimernih sistemov z visoko koncentracijo trdnih delcev

Funder:Other - Other funder or multiple funders
Project number:2020-00792


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Keywords:večnamenskost PLA kompozitov, tanin, površinske mehanske lastnosti, antioksidativno/antibakterijsko delovanje


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