Bio-Based Nanocomposites Obtained by Incorporation of Cellulose Nanocrystals Into Biodegradable Polymers Through Casting, Layer-by-Layer or Electrospinning Methods

Pereira, Fabiano Vargas; Paula, Everton Luiz de; Mesquita, João Paulo de; Lucas, Alessandra de Almeida; Mano, Valdir

doi:10.5935/0100-4042.20140141

Cited by 8 publications

(8 citation statements)

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“…The existence of nanocrystals can be proven by birefringence analysis and microscopy. According to Pereira et al [59], flow birefringence results from the alignment of nanoparticles and indicates the existence of isolated nanocrystals in the dispersion. As the cellulose nanocrystals are rigid rod-like particles, they have a strong tendency to align a vector director and increase in relation to particle size / diameter.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cellulose Nanocrystals from Different Lignocellulosic Residues to Chitosan/Glycerol Films

et al. 2019

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Interest in nanocellulose obtained from natural resources has grown, mainly due to the characteristics that these materials provide when incorporated in biodegradable films as an alternative for the improvement of the properties of nanocomposites. The main purpose of this work was to investigate the effect of the incorporation of nanocellulose obtained from different fibers (corncob, corn husk, coconut shell, and wheat bran) into the chitosan/glycerol films. The nanocellulose were obtained through acid hydrolysis. The properties of the different nanobiocomposites were comparatively evaluated, including their barrier and mechanical properties. The nanocrystals obtained for coconut shell (CS), corn husk (CH), and corncob (CC) presented a length / diameter ratio of 40.18, 40.86, and 32.19, respectively. Wheat bran (WB) was not considered an interesting source of nanocrystals, which may be justified due to the low percentage of cellulose. Significant differences were observed in the properties of the films studied. The water activity varied from 0.601 (WB Film) to 0.658 (CH Film) and the moisture content from 15.13 (CS Film) to 20.86 (WB Film). The highest values for tensile strength were presented for CC (11.43 MPa) and CS (11.38 MPa) films, and this propriety was significantly increased by nanocellulose addition. The results showed that the source of the nanocrystal determined the properties of the chitosan/glycerol films.

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Section: Resultsmentioning

confidence: 99%

Effect of Cellulose Nanocrystals from Different Lignocellulosic Residues to Chitosan/Glycerol Films

et al. 2019

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“…Cellulose nanocrystals (CNC) are renewable, biodegradable, nontoxic, and have excellent mechanical, optical, and physical properties [5][6][7]. They have been largely used to improve mechanical and barrier properties of polymer matrices [5,8,9]. However, due to nanocrystals hydrophilic nature, their dispersion in hydrophobic solvents and polymer matrices is relatively poor, which causes undesired effects, such as reduced mechanical properties of nanocomposites reinforced with CNC [6,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of morphology and dispersion stability of CNC modified with ethylene oxide derivatives on mechanical properties of PLA‐based nanocomposites

et al. 2018

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The aggregation state of cellulose nanocrystals modified with surfactants (CNC/S) in water and CNC/S powder dispersion stability in chloroform were studied and correlated with mechanical properties of nanocomposites with poly(lactic acid) (PLA). Four types of nonionic surfactants were used: PEG 300, PEG 1000, poly(ethylene glycol) monooleate, and Pluronic® L44 (PL44). The CNC/PL44 showed the smallest size of CNC aggregates dispersed in water before freeze‐drying, as determined by atomic force microscopy. The respective powder also showed the lowest decay rate of relative turbidity among CNC/S dispersions in chloroform. This, together with the improved surface coverage of CNC by PL44, verified by zeta potential (large change in the zeta potential of CNC/S dispersion in chloroform) and thermogravimetric analysis (improved thermal stability of CNC/S powder), yielded the highest tensile strength at break (TS) among PLA/CNC/S nanocomposites. Despite none of surfactants produced nanocomposites with TS higher than PLA or PLA/CNC, the aggregation state of CNC/S in water is well correlated with mechanical properties of PLA/CNC/S nanocomposites prepared by solvent casting. This correlation indicates that hornification cannot be avoided for the conditions used to prepare CNC/S powder and that there are two opposite effects in preparation of PLA/CNC/S nanocomposites. First, the effectiveness of steric barrier of nonionic surfactants against aggregation during freeze‐drying depends on complete surface coverage of CNC, together with hydration of stabilizing chain. Since hydration depends on hydrophilicity of stabilizing chain and compatibility with PLA depends on its nonpolar nature, this strategy alone seems not to be efficient to produce high‐performance nanocomposites. POLYM. COMPOS., 40:E399–E408, 2019. © 2018 Society of Plastics Engineers

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“…When incorporated in films with renewable polymeric matrixes, they produce total biodegradable composites [22] referred to as nanobiocomposites. As with any composite material, the properties of the nanobiocomposites depend on the properties of the individual components (matrix and reinforcement), the composition (volumetric fractions of the components), the morphology of each constituent phase (spatial arrangement, dimensions, and crystallinity), and the interfacial properties [23] .…”

Section: Introductionmentioning

confidence: 99%

“…Incidentally, Brazil is acknowledged as one of the largest agricultural producers in the world, contributing a large part of the millions of tons of lignocellulosic biomass produced globally from different sources [23] . The green coconut bark is an important source of natural fiber, and its utilization for the production of cellulose nanocrystals offers the benefit of reduced disposal of biomass [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

et al. 2017

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Bio-Based Nanocomposites Obtained by Incorporation of Cellulose Nanocrystals Into Biodegradable Polymers Through Casting, Layer-by-Layer or Electrospinning Methods

Cited by 8 publications

References 0 publications

Effect of Cellulose Nanocrystals from Different Lignocellulosic Residues to Chitosan/Glycerol Films

Effect of Cellulose Nanocrystals from Different Lignocellulosic Residues to Chitosan/Glycerol Films

Influence of morphology and dispersion stability of CNC modified with ethylene oxide derivatives on mechanical properties of PLA‐based nanocomposites

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

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