PVA/(ligno)nanocellulose biocomposite films. Effect of residual lignin content on structural, mechanical, barrier and antioxidant properties

Espinosa, Eduardo; Bascón-Villegas, Isabel; Rosal, Antonio; Pérez‐Rodríguez, Fernando; Chinga-Carrasco, Gary; Rodríguez, Alejandro

doi:10.1016/j.ijbiomac.2019.08.262

Cited by 115 publications

(100 citation statements)

References 59 publications

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“…The presence of hydroxyl groups in cellulosic fibers, and even some aromatic hydroxyls from lignin in the case of unbleached fibers, glimpse a good interface between polymer matrix and reinforcement. In fact, in the case of unbleached fibers or nanofibers, this interaction between aromatic hydroxyl groups present in lignin has been previously reported for polyolefin-based composites in the presence of maleated coupling agents or even with PVA matrices [3,41,42]. PVA has been widely used for the preparation of natural fiber reinforced composites, containing micro and nanostructured fibers, as well as lignocellulose [39].…”

Section: Introductionmentioning

confidence: 77%

“…In addition, the improvement was quantified in 46.7% in almost all cases, while this improvement was achieved with a 2.25 wt % load of CNF in the present work, being significantly improved at higher dosages. However, in that case, the selected CNF contained lignin, which might hinder the interaction with PVA [42]. Liu et al (2013) also reported a significant improvement on tensile strength due to the incorporation of CNF, obtaining a relative improvement of 19.8% for a 3 wt % CNF dosage.…”

Section: Macromechanical Evaluation Of the Compositesmentioning

confidence: 95%

“…Liu et al (2013) developed PVA-based nanocomposites that were reinforced with CNF by means of solution casting method, obtaining mechanical properties enhancement significantly low while taking the reinforcing potential and intrinsic properties of CNF into account [45]. More recently, Espinosa et al (2019) showed the effect of incorporating lignin-containing CNF into PVA matrices, obtaining a significant enhancement of the tensile strength. However, the authors adopted a solvent casting strategy as in many other works, thus limiting the industrial viability of such nanocomposites [42].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, Espinosa et al (2019) showed the effect of incorporating lignin-containing CNF into PVA matrices, obtaining a significant enhancement of the tensile strength. However, the authors adopted a solvent casting strategy as in many other works, thus limiting the industrial viability of such nanocomposites [42]. Indeed, the interesting properties of CNF against common cellulosic fibers should allow for the addition of low amount of CNF with important effects and improvements on the final properties of the nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the dispersion and orientation, it must be considered that it will mainly depend on the compounding and processing strategy. Thus, it is expected that, in the abovementioned works, the distribution of the reinforcement was appropriate, but CNF or CNC were randomly oriented, leading to completely isotropic structures [42,44,54]. On the other side, there are those materials processed by means of conventional techniques, such as extrusion and/or injection molding.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

et al. 2020

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The present work aims to combine the unique properties of cellulose nanofibers (CNF) with polyvinyl alcohol (PVA) to obtain high-performance nanocomposites. CNF were obtained by means of TEMPO-mediated ((2,2,6,6-Tetramethylpiperidin-1-yl)oxyl) oxidation, incorporated into the PVA matrix by means of compounding in a single-screw co-rotating internal mixer and then processed by means of injection molding. It was found that CNF were able to improve the tensile strength of PVA in 85% when 4.50 wt % of CNF were added. In addition, the incorporation of a 2.25 wt % of CNF enhanced the tensile strength to the same level that when 40 wt % of microsized fibers (stone groundwood pulp, SGW) were incorporated, which indicated that CNF possessed significantly higher intrinsic mechanical properties than microsized fibers. SGW was selected as reference for microsized fibers due to their extended use in wood plastic composites. Finally, a micromechanical analysis was performed, obtaining coupling factors near to 0.2, indicating good interphase between CNF and PVA. Overall, it was found that the use of CNF is clearly advantageous to the use of common cellulosic fibers if superior mechanical properties are desired, but there are still some limitations that are related to processing that restrict the reinforcement content at low contents.

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Section: Introductionmentioning

confidence: 77%

Section: Macromechanical Evaluation Of the Compositesmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

et al. 2020

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Surface and Interface Engineering for Nanocellulosic Advanced Materials

et al. 2020

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How do trees support their upright massive bodies? The support comes from the incredibly strong and stiff, and highly crystalline nanoscale fibrils of extended cellulose chains, called cellulose nanofibers. Cellulose nanofibers and their crystalline parts—cellulose nanocrystals, collectively nanocelluloses, are therefore the recent hot materials to incorporate in man‐made sustainable, environmentally sound, and mechanically strong materials. Nanocelluloses are generally obtained through a top‐down process, during or after which the original surface chemistry and interface interactions can be dramatically changed. Therefore, surface and interface engineering are extremely important when nanocellulosic materials with a bottom‐up process are fabricated. Herein, the main focus is on promising chemical modification and nonmodification approaches, aiming to prospect this hot topic from novel aspects, including nanocellulose‐, chemistry‐, and process‐oriented surface and interface engineering for advanced nanocellulosic materials. The reinforcement of nanocelluloses in some functional materials, such as structural materials, films, filaments, aerogels, and foams, is discussed, relating to tailored surface and/or interface engineering. Although some of the nanocellulosic products have already reached the industrial arena, it is hoped that more and more nanocellulose‐based products will become available in everyday life in the next few years.

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Effect of methyl orange as the modifier on the mechanical, thermal, and thermo‐mechanical properties of clay/epoxy composites

Baştürk

2021

J of Applied Polymer Sci

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In this study, bentonite clay/epoxy composites were simply and successfully produced via conventional casting method for 0.5, 1, and 2 wt% filler content.Previously modified clay (surfactant and silane agent applied) was treated with methyl orange (MO) and its effects on composites were investigated in terms of crystallographic, thermal, thermo-mechanical, morphologic, and topographic aspects as well as quasi-static characteristics. According to XRD graphs, MO presence led to the increase of interlayer distance and resulted in partial intercalation for modified clay (MC) based mixture, while an opposite case was seen in neat clay (NC) blend. The 2 wt% MO/MC loaded composite achieved the highest tensile modulus, flexural stiffness, and hardness values among all samples-increase of 14%, 40%, and 3%, respectively. Same composite system exhibited improved results for both glass transition temperature (~7%") and storage modulus (~35%"), in spite of insufficient thermal characteristics. Irregular particles/tactoids were present in the fracture images, which probably promoted the stress concentration and caused the reduction of strength parameter for all composites. Furthermore, independent of clay type (MC or NC) whole structures showed similar surface roughness values but different topographic textures in terms of surface profiles.

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PVA/(ligno)nanocellulose biocomposite films. Effect of residual lignin content on structural, mechanical, barrier and antioxidant properties

Cited by 115 publications

References 59 publications

Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

Surface and Interface Engineering for Nanocellulosic Advanced Materials

Effect of methyl orange as the modifier on the mechanical, thermal, and thermo‐mechanical properties of clay/epoxy composites

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