Recent advances in lignin antioxidant: Antioxidant mechanism, evaluation methods, influence factors and various applications

Li, Kongyan; Zhong, Wen‐Zhao; Li, Penghui; Ren, Jianpeng; Jiang, Kangjie; Wu, Wenjuan

doi:10.1016/j.ijbiomac.2023.125992

Cited by 20 publications

(4 citation statements)

References 186 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radical scavenging activity of lignin–epoxy composites was investigated using the DPPH assay method, and the results are shown in Figure 18 and Figure 19 . Lignin is a well-known radical scavenger due to the high concentration of phenolic Ohs [ 121 , 122 , 123 ] and thus has been utilized in many applications [ 36 , 122 , 124 , 125 ].…”

Section: Resultsmentioning

confidence: 99%

“…The radical scavenging activity of lignin-epoxy composites was investigated using the DPPH assay method, and the results are shown in Figures 18 and 19. Lignin is a wellknown radical scavenger due to the high concentration of phenolic OHs [121][122][123] and thus has been utilized in many applications [36,122,124,125]. Overall, the presence of lignin (KL, BMKL, and NLH) in the epoxy composites resulted in substantial scavenging activity of free radicals as compared to the pristine polymer.…”

Section: Antioxidant Properties and Solvent Resistance Of Lignin-epox...mentioning

confidence: 99%

See 1 more Smart Citation

Kraft (Nano)Lignin as Reactive Additive in Epoxy Polymer Bio-Composites

Pappa,

Cailotto,

Gigli

et al. 2024

Polymers

View full text Add to dashboard Cite

The demand for high-performance bio-based materials towards achieving more sustainable manufacturing and circular economy models is growing significantly. Kraft lignin (KL) is an abundant and highly functional aromatic/phenolic biopolymer, being the main side product of the pulp and paper industry, as well as of the more recent 2nd generation biorefineries. In this study, KL was incorporated into a glassy epoxy system based on the diglycidyl ether of bisphenol A (DGEBA) and an amine curing agent (Jeffamine D-230), being utilized as partial replacement of the curing agent and the DGEBA prepolymer or as a reactive additive. A D-230 replacement by pristine (unmodified) KL of up to 14 wt.% was achieved while KL–epoxy composites with up to 30 wt.% KL exhibited similar thermo-mechanical properties and substantially enhanced antioxidant properties compared to the neat epoxy polymer. Additionally, the effect of the KL particle size was investigated. Ball-milled kraft lignin (BMKL, 10 μm) and nano-lignin (NLH, 220 nm) were, respectively, obtained after ball milling and ultrasonication and were studied as additives in the same epoxy system. Significantly improved dispersion and thermo-mechanical properties were obtained, mainly with nano-lignin, which exhibited fully transparent lignin–epoxy composites with higher tensile strength, storage modulus and glass transition temperature, even at 30 wt.% loadings. Lastly, KL lignin was glycidylized (GKL) and utilized as a bio-based epoxy prepolymer, achieving up to 38 wt.% replacement of fossil-based DGEBA. The GKL composites exhibited improved thermo-mechanical properties and transparency. All lignins were extensively characterized using NMR, TGA, GPC, and DLS techniques to correlate and justify the epoxy polymer characterization results.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Antioxidant Properties and Solvent Resistance Of Lignin-epox...mentioning

confidence: 99%

Kraft (Nano)Lignin as Reactive Additive in Epoxy Polymer Bio-Composites

Pappa,

Cailotto,

Gigli

et al. 2024

Polymers

View full text Add to dashboard Cite

show abstract

“…These measures shield the matrix from weather-induced effects and mitigate the impact of environmental conditions [45,60]. Notably, the phenomenon was less pronounced in R-PP3x/5CHF (Figure 5), which is characterized by higher fiber content and an increased presence of lignin, which contribute to the observed antioxidant effect [61][62][63][64][65].…”

Section: Morphology Analysismentioning

confidence: 99%

Natural Aging of Reprocessed Polypropylene Composites Filled with Sustainable Corn Fibers

Matos,

Dias,

Rosa

et al. 2024

Polymers

View full text Add to dashboard Cite

Natural fiber reinforcements have the potential to enhance mechanical properties, thereby improving performance and durability in various applications. In this study, we comprehensively evaluated the impact of environmental degradation over 120 days on reprocessed polypropylene (PP) reinforced with corn husk fiber (CHF) composites. The manufactured systems underwent rigorous analysis using various techniques, including Fourier transform infrared spectroscopy, thermogravimetric analysis, optical microscopy, scanning electron microscopy, and tensile testing. These analyses revealed that climatic conditions significantly influenced (p < 0.05) the mechanical properties of all systems. Photodegradation led to surface morphological changes and chemical structures. Regardless, adding CHF filler proved a key factor, as it allowed for less susceptibility to environmental degradation than the reprocessed matrix. These findings, therefore, provide robust evidence supporting the feasibility of using CHF composites for manufacturing agricultural containers.

show abstract

“…47 Due to the free radical scavenging and UV-absorbing abilities of phenolic resins, the phenolic ring in the structure of lignin possesses various intriguing properties, including antioxidant and UV resistance. 48,49 Consequently, LCNCs have better thermal stability, antioxidant and UV resistance than CNCs. 50…”

Section: Nanocellulose and Nanocellulose Hydrogelsmentioning

confidence: 99%