Green nanocomposites based on thermoplastic starch and steam exploded cellulose nanofibrils from wheat straw

Kaushik, Anupama; Singh, Mandeep; Verma, Gaurav

doi:10.1016/j.carbpol.2010.04.063

Cited by 449 publications

(215 citation statements)

References 32 publications

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“…This result indicated that the nanofibers extracted from rice hulls had increased the thermal stability. Our results were similar to those of Abraham et al, 17 who produced nanofibrillated cellulose from banana, pineapple leaf and jute fibers using alkaline treatment followed by steam explosion and acid hydrolysis. Paschoal et al, 16 also reported that nanofibers extracted from oat hulls possessed a higher thermal stability than the raw material.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 91%

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Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

et al. 2016

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Rice hull is a residue from agro-industry that can be used to produce nanocellulose. We produced nanocellulose from rice hulls through bleaching (with a 5% NaOH solution followed by a peracetic acid solution) and acid hydrolysis at a mild temperature (45ºC) followed by ultrasonication. We investigated the microstructure, crystallinity and thermal stability of these materials and studied their effects on the properties of starch films. After bleaching, the compact structure around the cellulosic fibers was removed, and the lignin content of the residue decreased from 7.22 to 4.22%. The obtained nanocellulose presented a higher crystallinity (up 70%), higher thermal stability than the raw material and lignin contents below 0.35%. The nanocellulose formed interconnected webs of tiny fibers (< 100 nm in diameter), which decreased the opacity, water vapor permeability and improved the mechanical properties when added as reinforcement in the starch films.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 91%

“…Cellulose nanofibrils are used as a reinforcing material in starch films to improve their mechanical and barrier properties 17,18 . However, their effect depends on the cellulose source and extraction method 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

et al. 2016

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“…This thermal transition peak was shifted to higher temperatures, and at the same time, its intensity was enhanced as the biofiber content was increased. This shift toward higher temperatures can be related to the decreasing mobility of the polymer chain, as a consequence of interaction between fiber and matrix [39]. Reinforcement with long keratin biofibers has also a strong influence on the T g of ChS-LB composites, as can be appreciated in Figure 17.…”

Section: Dynamical Mechanical Analysismentioning

confidence: 86%

“…The presence of keratin reinforcement in all cases shows an increase in T g value, the hydrophobic behavior of keratin fibers [17] produces a decrease in moisture content, thereby reducing the internal friction. Thermal transitions of thermoplastic starch depend on the plasticizer content, the humidity conditions as well as the composition of starch and chitosan [39]. In the same sense chitosan-starch reinforced with keratin biofibers depends on similar parameters.…”

Section: Dynamical Mechanical Analysismentioning

confidence: 99%

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

et al. 2014

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Abstract:The performance as reinforcement of a fibrillar protein such as feather keratin fiber over a biopolymeric matrix composed of polysaccharides was evaluated in this paper. Three different kinds of keratin reinforcement were used: short and long biofibers and rachis particles. These were added separately at 5, 10, 15 and 20 wt% to the chitosan-starch matrix and the composites were processed by a casting/solvent evaporation method. The morphological characteristics, mechanical and thermal properties of the matrix and composites were studied by scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry and dynamic mechanical analysis. The thermal results indicated that the addition of keratin enhanced the thermal stability of the composites compared to pure matrix. This was corroborated with dynamic mechanical analysis as the results revealed that the storage modulus of the composites increased with respect to the pure matrix. The morphology, evaluated by scanning electron microscopy, indicated a uniform dispersion of keratin in the chitosan-starch matrix as a result of good compatibility between these biopolymers, also corroborated by FTIR. These results demonstrate that chicken feathers can be useful to obtain novel keratin reinforcements and develop new green composites providing better properties, than the original biopolymer matrix.

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“…e permeability reduction is strongly related to the reduction in the coefficient of diffusion provided by the presence of micro/nanofibrils [32], which leads to improvement of the barrier to water vapor.…”

Section: Characteristics Of Different Film Formulationsmentioning

confidence: 99%

Chitosan/Cellulose Nanofibril Nanocomposite and Its Effect on Quality of Coated Strawberries

Resende

Gonçalves²,

Reis

et al. 2018

Journal of Food Quality

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e aim of this study was to develop a chitosan/cellulose nano bril (CNF) nanocomposite and evaluate its e ect on strawberry's postharvest quality after coating. From the results of color, thickness, and scanning electron microscopy (SEM) and permeability to water vapor analyses, the best lm formulation for coating strawberries was determined. ree coating formulations were prepared: 1% chitosan, 1% chitosan + 3% CNF, and 1% chitosan + 5% CNF. e strawberries were immersed in the lmogenic solutions and kept under cold storage (1 ± 1°C). e color of the lm was not a ected by increased concentration of cellulose nano brils; however, the thickness and water vapor permeability were a ected by the CNF addition. e coating with the highest CNF concentration performed better in reducing fruit mass and rmness loss. e color was positively in uenced by the addition of the coating, regardless of formulation, as well as soluble solid content, PG enzymatic activity, and the fruit appearance. e pH and titratable acidity showed no signi cant di erence among treatments. It was observed that the vitamin C, phenolic compounds, and anthocyanin content, as well as the PAL activity and the antioxidant activity (except for % protection), were a ected by chitosan coating, however not by the addition of CNFs.

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Green nanocomposites based on thermoplastic starch and steam exploded cellulose nanofibrils from wheat straw

Cited by 449 publications

References 32 publications

Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

Chitosan/Cellulose Nanofibril Nanocomposite and Its Effect on Quality of Coated Strawberries

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