Crystal transition from cellulose I to cellulose II in NaOH treated Agave americana L. fibre

Oudiani, Asma El; Chaabouni, Yassine; Msahli, Slah; Sakli, Faouzi

doi:10.1016/j.carbpol.2011.06.037

Cited by 262 publications

(131 citation statements)

References 62 publications

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“…All diffraction patterns showed peaks around 2ϴ= 15, 22, 24 and 30°, indicating the structure of cellulose type I (Oudiani et al, 2011). There was a difference between the peaks and this was due to the changes in intensities which represent the crystallinity differences of the fibers.…”

Section: Crystallinity Studiesmentioning

confidence: 95%

“…The differences observed in these indexes are related to the ratio of cellulose in the fiber shown in Table 1. Oudiani et al (2011) report that those diffractograms with 2ϴ = 14° and 2ϴ = 16° peaks correspond to amorphous material such as lignin, hemicellulose, pectin, and amorphous cellulose and in percentages lower than 20% of NaOH. The peaks that were not marked were considered to be of low crystallinity cellulose, containing a lower ratio of amorphous cellulose.…”

Section: Crystallinity Studiesmentioning

confidence: 98%

“…Todos los patrones de difracción mostraron picos alrededor de 2ϴ= 15, 22, 24 y 30°, indicando la estructura de celulosa tipo I (Oudiani et al, 2011). Hubo diferencia entre los picos y esto se debió a cambios de intensidades que representan las diferencias de cristalinidad de las fibras.…”

Section: Estudios De Cristalinidadunclassified

“…Las diferencias observadas en estos índices se relacionan con la proporción de celulosa en la fibra mostrada en el Cuadro 1. Oudiani et al (2011), reporta que difractogramas con picos en 2ϴ = 14° y 2ϴ = 16° corresponden a material amorfo como lignina, hemicelulosa, pectina y celulosa amorfa y en porcentajes menores al 10% de NaOH, los picos no pronunciados se consideran celulosa de baja cristalinidad, esto es contienen menor proporción de celulosa amorfa. Tomando en consideración estos resultados el FACT ácido-álcali presenta una mayor proporción de When applying the acid-alkali treatment with and without pressure, the products of degradation become more pronounced with bigger spaces between them [ Figure 4(2) and 4(3)], which confirms the level of polymerization and crystallinity of the untreated agave when compared to the one treated with acid-alkali.…”

Section: Estudios De Cristalinidadunclassified

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Aislamiento y caracterización de celulosas obtenidas de fibras de Agave salmiana aplicando dos métodos de extracción ácido-alcali

Naranjo¹,

Alamilla‐Beltrán²,

Gutiérrez‐López³

et al. 2017

Remexca

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ResumenPara aprovechar las pencas de agaves (A. salmiana) una vez que se retiran de la piña de la planta, se obtuvieron fibras. Las hojas fueron tratadas con hidrólisis ácida (HCl) e hidrólisis alcalina (NaOH), usando presión de 1.1 kg/cm 2 (FACT ácido-álcali con presión), a 121 °C por 4 h y otro tratamiento a presión atmosférica con reflujo (FACT ácido-álcali sin presión). Se determinó el porcentaje de celulosa y lignina, así como los cambios fisicoquímicos por medio de calorimetría diferencial de barrido (DSC), termogravimetría (TG), Difracción de rayos X (DRX), Espectroscopia infrarroja (IR) y Microscopia electrónica de barrido ambiental (MEB). El mayor contenido de celulosa (79.95%) se obtuvo para el tratamiento FACT ácido-álcali sin presión, presentando también una mayor cristalinidad (50.07). La microestructura mostró que el tratamiento FACT ácido-álcali con presión mostró más espacios vacíos, esto debido a la degradación de las fibras, lo cual se asocia a una pérdida de celulosa. Ambos tratamientos afectaron la estructura y composición de las fibras de agave.Palabras clave: celulosa, fibras de agave, lignina, tratamiento ácido-base sin presión, tratamiento ácido-base con presión. AbstractFibers were obtained in order to make use of the agave leaves (A. salmiana) once the heart of the plant was removed. The leaves were treated with acid hydrolysis (HCl) and alkaline hydrolysis (NaOH), using a pressure of 1

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Section: Crystallinity Studiesmentioning

confidence: 95%

Section: Crystallinity Studiesmentioning

confidence: 98%

Section: Estudios De Cristalinidadunclassified

See 2 more Smart Citations

Aislamiento y caracterización de celulosas obtenidas de fibras de Agave salmiana aplicando dos métodos de extracción ácido-alcali

Naranjo¹,

Alamilla‐Beltrán²,

Gutiérrez‐López³

et al. 2017

Remexca

View full text Add to dashboard Cite

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“…where I002 is the maximum intensity of diffraction of the (002) lattice peak at a 2θ angle between 22° and 23° and Iam is the diffraction intensity of the amorphous material, which was taken at 2θ angle between 15° to 19° where intensity was at the minimum level [19].…”

Section: Methodsmentioning

confidence: 99%

Cellulose Micro/Nanofibres of Merbau (Intsia bijuga) Waste: Effects of Chemical Treatments on Structural and Morphology Features

Razali¹,

Aziz²,

Rahman³

2017

Asian J. Chem.

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Application of various carboxylic acids modified walnut shell waste as natural filler for epoxy‐based composites

Albaker

Kocaman

Martı

et al. 2021

J of Applied Polymer Sci

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In this study, chemically modified walnut shells (WS) were used as the filling material for synthesis of bio‐based epoxy composites and added to the matrix at varied mass ratios (10%–50%). The shells were initially treated with alkali and then modified with three different organic acids (citric acid [CA], oxalic acid [OA], and formic acid [FA]). The WS were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy (SEM)/energy‐dispersive X‐ray spectroscopy (EDX) and thermo gravimetric analyzer. The SEM and X‐ray diffraction were employed to observe the morphology of the composites. The influences of acid type and WS percentages on the mechanical, thermal and water sorption properties were investigated. The maximum tensile strength (124.8 MPa) was obtained with CA‐treated shells (CA‐WS) and followed by OA‐treated shells (OA‐WS) (117 MPa) and FA‐treated shells (FA‐WS) (96.5 MPa). Acid modification had a positive effect on Young's modulus as that of epoxy resins increased by 5.45%–50.91%. The treatment did not significantly affect hardness. The optimum amount of modified shells in the composites was found to be 20 wt%. Water sorption values changed in the range of 2.78%–3.42% for composites with 20 wt% WS and observed to increase with the filler amount in the composite. However, this trend and the slight decrease in thermal properties are not critical obstacles for the use of modified WS in the manufacture of inexpensive epoxy‐ and bio‐based eco‐friendly products.

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Crystal transition from cellulose I to cellulose II in NaOH treated Agave americana L. fibre

Cited by 262 publications

References 62 publications

Aislamiento y caracterización de celulosas obtenidas de fibras de Agave salmiana aplicando dos métodos de extracción ácido-alcali

Aislamiento y caracterización de celulosas obtenidas de fibras de Agave salmiana aplicando dos métodos de extracción ácido-alcali

Cellulose Micro/Nanofibres of Merbau (Intsia bijuga) Waste: Effects of Chemical Treatments on Structural and Morphology Features

Application of various carboxylic acids modified walnut shell waste as natural filler for epoxy‐based composites

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