Effect of lignin acetylation on the mechanical properties of lignin-poly-lactic acid biocomposites for advanced applications

Johansson, Matilda; Skrifvars, Mikael; Kadi, Nawar; Dhakal, Hom Nath

doi:10.1016/j.indcrop.2023.117049

Cited by 10 publications

(5 citation statements)

References 39 publications

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“…As reported by Kim et al (2017) , the combination of acetylated lignin with PLA exhibited a lower water vapor transmission rate compared to unmodified lignin. Similarly, Johansson et al (2023) observed a significant delay in moisture absorbance for acetylated lignin over 28 days, and Kim et al (2023) noted the maintenance of contact angles from water droplet experiments. The acetylation reaction primarily blocks hydroxyl groups in lignin, increasing hydrophobicity and consequently reducing lignin’s interaction with water.…”

Section: Discussionmentioning

confidence: 81%

“…Simultaneously, the interaction between lignin and PLA ought to be enhanced. In such instances, chemical modification of lignin, mainly acetylation has been proposed to improve compatibility and thermal stability compared to unmodified lignin in PLA( Gordobil et al, 2014 ; Kim et al, 2017 ; Li et al, 2017 ; Park et al, 2019 ; Johansson et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

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Elucidating intermolecular forces to improve compatibility of kraft lignin in poly(lactic acid)

Esakkimuthu,

Ponnuchamy,

Sipponen

et al. 2024

Front. Chem.

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Owing to its abundant supply from renewable resources, lignin has emerged as a promising functional filler for the development of sustainable composite materials. However, achieving good interfacial compatibility between lignin and synthetic polymers, particularly poly (lactic acid) (PLA), remains a fundamental challenge. To advance the development of high-performance bio-based composites incorporating lignin and PLA, our study has scrutinized to unravel the nuances of interfacial binding interactions with the lignin and PLA composite system. Molecular level and experimental examinations were employed to decipher fundamental mechanisms governing and demonstrating the interfacial adhesion. We synthesized casted films of lignin/PLA and acetylated lignin/PLA at varying weight percentages of lignin (5%, 10%, and 20%) and comprehensively investigated their physicochemical and mechanical properties. The inclusion of acetylated lignin in the composites resulted in improved mechanical strength and Young’s modulus, while the glass transition temperature and melting point were reduced compared to neat PLA. Systematic variations in these properties revealed distinct compatibility behaviors between unmodified lignin and acetylated lignin when incorporated into PLA. Molecular dynamics (MD) simulation results elucidated that the observed changes in material properties were primarily attributed to the acetylation of lignin. Acetylated lignin exhibited lower Coulombic interaction energy and higher van der Waals forces, indicating a stronger affinity to PLA and a reduced propensity for intermolecular aggregation compared to unmodified lignin. Our findings highlight the critical role of controlling intermolecular interactions and lignin aggregation to develop PLA composites with predictable performance for new applications, such as functional packaging materials.

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Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Elucidating intermolecular forces to improve compatibility of kraft lignin in poly(lactic acid)

Esakkimuthu,

Ponnuchamy,

Sipponen

et al. 2024

Front. Chem.

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show abstract

“…2a, the absorption peaks at 1766 and 1741 cm −1 in ACAL corresponded to the side-chain carboxylate and aromatic carboxylate, respectively. 51,52 The peak at 1371 cm −1 in ACAL was attributed to acetyl. The absorption peaks of AL at 1215, 1149 and 1114 cm −1 corresponded to phenolic hydroxyl groups, and tertiary and secondary alcoholic hydroxyl groups, respectively.…”

Section: Resultsmentioning

confidence: 99%

Mechanism study of the photothermal function of lignin: the effect of electron-withdrawing groups

Lei,

Chen,

Lin

et al. 2024

Green Chem.

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“…Density of the laminates was calculated using Archimedes principle and details of the test can be found in previous study reported in the literature [ 29 , 30 ]. This study focuses on both the structural changes of jute fibres and chemical treatments on both fibres and metals to study the compatibility of them while reinforced with epoxy matrix.…”

Section: Resultsmentioning

confidence: 99%

Improved mechanical properties of environmentally friendly jute fibre reinforced metal laminate sandwich composite through enhanced interface

Haq,

Saifullah,

Habib

et al. 2024

Heliyon

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Effect of lignin acetylation on the mechanical properties of lignin-poly-lactic acid biocomposites for advanced applications

Cited by 10 publications

References 39 publications

Elucidating intermolecular forces to improve compatibility of kraft lignin in poly(lactic acid)

Elucidating intermolecular forces to improve compatibility of kraft lignin in poly(lactic acid)

Mechanism study of the photothermal function of lignin: the effect of electron-withdrawing groups

Improved mechanical properties of environmentally friendly jute fibre reinforced metal laminate sandwich composite through enhanced interface

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