Surface and thermal characterization of natural fibres treated with enzymes

George, Michael; Mussone, Paolo; Bressler, David C.

doi:10.1016/j.indcrop.2013.12.037

Cited by 141 publications

(110 citation statements)

References 42 publications

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“…Pectinase enzymes are specific, for that matter they are capable of removing pectin from ramie fibers. Unlike the chemical treatments, the efficiency of removing other impurities was insufficient .…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, other samples of ramie fibers were added to pectinase enzymes solution (10 g of pectinase enzymes per 100 mL of water) which was activated in lukewarm water (45.6°C) in acetic acidic media (4–5 pH). The application of pectinase is growing recently since pectinase is specific in their reaction nature (means of removing pectin) . In our previous work , we showed that pectinase enzymes could readily dissolve pectin from the surface of fibers and hence the fibers were kept in this solution for 3 h. Subsequently, the fibers were washed carefully with water and stored in an oven at 80°C for 2 h to deactivate the enzymes.…”

Section: Methodsmentioning

confidence: 99%

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Improved thermal and mechanical performance of ramie fibers reinforced poly(lactic acid) biocomposites via fiber surface modifications and composites thermal annealing

et al. 2018

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Ramie fibers reinforced poly(lactic acid) (PLA) biocomposites in the recent past have gained a lot of research attention for various applications due to their biodegradability, lightweight and renewable advantages. However, their low thermal stability performances and poor mechanical properties have to this date limited their industrial use. Herein, an approach to solve the two mischiefs is presented, which involved first surface modifying of ramie fibers followed by thermal annealing of the reinforced PLA biocomposites. The resultant biocomposites showed tunable mechanical and thermal resistance properties. These improved properties are ascribed to the improved interfacial bonding of the modified ramie fibers and PLA polymer, courtesy of newly introduced reactive groups onto fibers which were capable of building strong interface bonds between the polymer–fiber boundaries. More still, the thermal stability of the resultant composite is attributed to the thermal annealing condition which provided crystallized PLA molecules upon exposure to high temperatures and the steady cooling responsible for the increased degree of crystallinity in the composites as confirmed from X‐ray diffraction and differential scanning calorimetric data results. Beyond ramie fibers‐based composites reported herein, the presented methodology can also be extended to other natural plant fiber‐based composites. These modifications are capable of providing better PLA/natural fiber‐based composites for automobiles, electronics, and other related domains. POLYM. COMPOS., 39:E1867–E1879, 2018. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Improved thermal and mechanical performance of ramie fibers reinforced poly(lactic acid) biocomposites via fiber surface modifications and composites thermal annealing

et al. 2018

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“…These variations in the thermal behavior may be explained by the exposition of the three basic chemical constituents of pineapple fibers (cellulose, hemicellulose, and lignin). Lignin is the component with greatest resistance to thermal degradation, followed by cellulose and, finally, by hemicellulose, which is the least thermally stable (George et al 2014). Various studies agree that the temperature range in which hemicellulose is degraded spans from 150 °C to 350 °C; cellulose presents its maximum decomposition between 275 °C and 350 °C; and the range corresponding to lignin degradation is from 250 °C to 500 °C (Neto et al 2015).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…5a); therefore, the range of thermal degradation of cellulose (George et al 2014) was affected starting at this stage, probably due to the decrease in the amount of cellulose as colonization time progressed (Table 1). T. versicolor, from a certain point in the colonization period, aggressively degraded not only lignin and hemicellulose but cellulose as well, as its action was not selective upon lignin, thus decreasing the cellulose content and rendering the material less thermally stable (George et al 2014;Bari et al 2015). This behavior was nevertheless not so noticeable in pulp generated by P. ostreatus, for which variation of the mass at maximum decomposition was almost constant (Fig.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Biopulp from Pineapple Leaf Fiber Produced by Colonization with Two White-Rot Fungi: Trametes versicolor and Pleurotus ostreatus

et al. 2016

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Trametes versicolor and Pleurotus ostreatus were used for the biopulping from pineapple leaf fiber (PALF). PALF substrate was subjected to T. versicolor for 2 to 6 weeks and to P. ostreatus for 4 to 8 weeks. The yields, holocellulose and lignin contents, and extractives in ethanol-toluene mixture and in sodium hydroxide (NaOH) solution were evaluated. Fourier transform infrared spectroscopy (FTIR) spectra, thermogravimetric analysis (TGA), and color studies by L*a*b* systems were used for sample analysis. The results showed that the pulp yield was 55% to 70% with P. ostreatus and 35% to 50% with T. versicolor. Longer colonization periods increased the amount of holocellulose and decreased the amount of lignin and extractives in ethanol-toluene and NaOH solution. TGA showed an increase in intensity associated with cellulose, and the observed inflexion was attributed to lignin, which showed a tendency to fade. The FTIR spectrum showed high intensity between 3100 cm -1 and 3600 cm -1(cellulose) and decreased intensity at 1730 cm -1 (lignin). For both fungi, the pulp color produced an increase in L* color parameter and decreased in yellowness, while little variation was observed in redness. The most appropriate colonization period was 5 weeks for P. ostreatus and 4 weeks for T. versicolor.

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“…Natural fiber‐reinforced composites have been used for many applications, such as automotive components, aerospace parts, sporting goods, and construction industry. Natural fibers have many advantages over synthetic fibers, for instance, environmental friendliness, cost‐effectiveness, light weight, biodegradability, and acceptable mechanical properties . However, these fibers are highly hydrophilic in nature.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface modification of jute fiber on the mechanical properties and durability of jute fiber‐reinforced epoxy composites

et al. 2018

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In this article, the effect of various surface modifications on the properties and durability of jute fiber‐reinforced epoxy composites (JFRECs) was studied. Jute fiber was surface modified to improve its compatibility with the hydrophobic epoxy matrix. The surface modifications investigated include alkali treatment, silane treatment, and the combined effect of alkali and silane treatments. JFRECs were prepared by vacuum‐assisted resin infusion (VARI) process. The surface topography of the untreated and modified fibers was examined by means of scanning electron microscopy (SEM). The mechanical properties, such as flexural properties and interfacial shear strength (IFSS), and thermomechanical properties, such as dynamic mechanical analysis (DMA) of the composites of untreated and modified fibers were determined. The durability studies such as water uptake as well as the effect of moisture on the mechanical and thermomechanical properties of the untreated and combined chemically treated fiber composites were examined. It was found that the combined modification provided better mechanical and thermal properties of composites in comparison with untreated composite due to strong fiber–matrix interfacial adhesion. The rate of water absorption for chemically treated fiber composite was found to be lesser than the untreated fiber composite. There was a significant drop in the mechanical and thermomechanical properties of the composites after exposure to moisture. This could be due to the fiber degradation and de‐bonding at the interface during the immersion of the composite samples in water. POLYM. COMPOS., 39:E2519–E2528, 2018. © 2018 Society of Plastics Engineers

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Surface and thermal characterization of natural fibres treated with enzymes

Cited by 141 publications

References 42 publications

Improved thermal and mechanical performance of ramie fibers reinforced poly(lactic acid) biocomposites via fiber surface modifications and composites thermal annealing

Improved thermal and mechanical performance of ramie fibers reinforced poly(lactic acid) biocomposites via fiber surface modifications and composites thermal annealing

Biopulp from Pineapple Leaf Fiber Produced by Colonization with Two White-Rot Fungi: Trametes versicolor and Pleurotus ostreatus

Effect of surface modification of jute fiber on the mechanical properties and durability of jute fiber‐reinforced epoxy composites

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