PBAT/kraft lignin blend in flexible laminated food packaging: Peeling resistance and thermal degradability

Tavares, Lara Basílio; Ito, Nathalie Minako; Salvadori, M. C.; Santos, Demétrio Jackson dos; Rosa, Derval dos Santos

doi:10.1016/j.polymertesting.2018.03.004

Cited by 107 publications

(53 citation statements)

References 41 publications

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“…The same behavior was verified for ALK-containing samples. Results are in agreements with previous works, in which lignin aggregation were verified for concentration of 20 wt% into PP 34 , or 10% into PBAT 36 .…”

Section: Scanning Electron Microscopy (Sem)supporting

confidence: 93%

Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation

et al. 2019

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Low surface energy and poor adhesion are well-known characteristics of polypropylene (PP). Surface treatments such as plasma, corona, and laser are usually applied to overcome these limitations. However, current studies highlight the incorporation of hydrophilic or amphiphilic polymers into hydrophobic low-surface-energy polymers as an alternative for increasing surface energy and thus improving adhesion. Lignin could be a promising amphiphilic polymer for use in increasing surface energy. In this work, PP/kraft lignin composites were obtained by incorporating up to 5 wt% of kraft lignin (KL) into a PP matrix. Corona treatment was applied to pristine PP and composites surfaces. Contact angle measurements and peeling tests were carried out to investigate the effects of KL incorporation and corona treatment on the surface energy and the mechanical strength of adhesion. Differential scanning calorimetry (DSC) was used to evaluate the PP's crystallinity index and recrystallization temperature and to dismiss their effects on the surface energy changes. Scanning electron microscopy (SEM) was applied to investigate the lignin dispersion. The results show that KL incorporation has potential as a method to improve the surface energy of PP, improve its poor adhesion, and enhance the effects of corona treatment.

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Section: Scanning Electron Microscopy (Sem)supporting

confidence: 93%

Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation

et al. 2019

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“…As reported by Sudhakaran et al [41], lignin may present an amphiphilic nature and promote the interaction with the polymeric matrix, in particular PBAT. The aromatic rings of lignin and PBAT can interact via hydrogen bonding, forming a π-π complex and promoting adhesion between the phases [42].…”

Section: Resultsmentioning

confidence: 99%

“…Control of the wettability, besides degradation, is essential to determine the application of a material. The increase of hydrophobicity observed for N samples is desirable for use as food packaging, due to the improved barrier property against water and gases [42].…”

Section: Resultsmentioning

confidence: 99%

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Composite films of ecofriendly lignocellulosic nanostructures in biodegradable polymeric matrix

2019

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Cellulose nanostructures (CNS) are an alternative for reinforcement of biodegradable polymers. However, the usual process applied to obtain them is environmentally harmful, generating chemical wastes, mostly in the lignin removal process. In this work, bionanocomposites reinforced with CNS were obtained using a process with lower environmental impact, viz. enzymatic hydrolysis of Pinus wood, with or without alkaline pretreatment for lignin removal. They were then incorporated into poly(butylene adipate-co-terephthalate) (PBAT) at 1%, 3%, and 5% (wt./wt.) by a solvent casting process with a nonionic surfactant as surface modification agent. The properties of the obtained composites indicated that pretreatment for lignin removal was not necessary to improve the mechanical properties. The isolated nature of the CNS led to a better distribution in the casting process and similar mechanical properties, with an increase in the Young's modulus by 16%. Addition of the surfactant helped improve the dispersion of the reinforcement but did not affect the mechanical properties. The interaction with water was affected by the addition of surfactant, which resulted in a hydrophilic composite and influenced its post-use degradation. The results of this work confirm that it is possible to produce CNS composites without excessive consumption of reagents and that their properties can be modified for use in different packaging applications.

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“…It is an amorphous, cross-linked and threedimensional phenolic polymer consisting of methoxylated phenylpropane structures [3]. Kraft lignin (KL), a derivative of native lignin, is obtained as a by-product from a pulping process at a large scale [4]. Although the annual lignin extraction in pulp operation around the world is estimated at 60 million [4], the compound is treated as a waste and burned for steam and power generation [6], and less than 2% is recovered for utilization as a chemical product [2,7].…”

Section: Introductionmentioning

confidence: 99%

Stabilization effect of kraft lignin into PBAT:Thermal analyses approach

Tavares

Rosa

2019

Matéria (Rio J.)

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Sterically hindered phenols are an important class of synthetic antioxidants for polymers, commonly incorporated to inhibit polyolefins or polyesters oxidation. However, synthetic antioxidants use is under restricted regulation due to their potential health risk and environmental impacts. Thus, great interest has been attracted to the phenol-based natural antioxidant such as lignin. This work aimed to evaluate the thermostability of kraft lignin (KL) as a natural antioxidant when incorporated into poly(butylene adipate-co-terephthalate) (PBAT) matrix. PBAT-KL films (0%, 1%, 3%, 5% and 10%, by mass) were prepared by twin-screw extrusion followed by thermo-compression. These materials were examined in detail for their effect on the thermal stability using the oxidative induction time (OIT), oxidative induction temperature (OIT emp) and thermogravimetric analysis (TG). According to the results, lignin-containing compositions have improved thermal resistance in oxidative environment, compared to neat PBAT. However, 10 wt.% lignin composition presented the lowest thermostability among lignin-containing compositions. The results showed that kraft lignin promotes the thermal stabilization of PBAT films at the optimal concentration of 1% by mass.

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PBAT/kraft lignin blend in flexible laminated food packaging: Peeling resistance and thermal degradability

Cited by 107 publications

References 41 publications

Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation

Improvement of Polypropylene Adhesion by Kraft Lignin Incorporation

Composite films of ecofriendly lignocellulosic nanostructures in biodegradable polymeric matrix

Stabilization effect of kraft lignin into PBAT:Thermal analyses approach

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