Characterisation of solution cast cellulose nanofibre – reinforced  poly(lactic acid)

Dongyan, Liu; Yuan, Xiaohui; Bhattacharyya, Debes; Easteal, Allan J.

doi:10.3144/expresspolymlett.2010.5

Cited by 137 publications

(87 citation statements)

References 17 publications

(16 reference statements)

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“…Chemical treatment is the most effective way to obtain a higher purity cellulose. A combination of chlorite bleaching, alkali treatment, and acid hydrolysis is the most common process used to extract cellulose from the plants (Habibi et al 2010;Liu et al 2010;Rosa et al 2010;Siqueira et al 2010;Chen et al 2012;Kargarzadeh et al 2012;Sheltami et al 2012;Zaini et al 2013). Chlorite bleaching has the function of extracting holocellulose from raw cellulose fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Acid hydrolysis is used to degrade amorphous cellulose. Many researchers have obtained cellulose from different fibers and plants, such as wood (Araki et al 1998;Beck-Candanedo et al 2005), banana (Cherian et al 2008), yarns (Liu et al 2010), coconut husk fibers (Rosa et al 2010), potato peel waste (Chen et al 2012), mengkuang leaves , bamboo (He et al 2013), and kenaf fiber Zaini et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Preparation Conditions on Cellulose from Oil Palm Empty Fruit Bunch Fiber

Ching

2014

BioRes

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The effects of chlorite bleaching on the properties of cellulose derived from oil palm empty fruit bunch (OPEFB) fiber were investigated in this work. Cellulose was extracted from oil palm empty fruit bunch fiber via chlorite bleaching, alkali treatment, and acid hydrolysis. Cellulose was extracted by varying the bleaching duration, which corresponded to 4, 8, or 12 h. Fourier transform infrared (FTIR) analysis showed that the lignin and hemicellulose were significant removed after the bleaching process, whereas no spectral differences were observed in the samples with the increase of bleaching durations. The main removal of the lignin and hemicellulose components had occurred during the bleaching process. There was only slight additional removal of lignin and hemicellulose during the further extraction process with alkali and acid hydrolysis. The peaks at 1740 cm-1 and 1246 cm-1 which represent hemicellulose and lignin, respectively, were not present in the final extracted cellulose. The cellulose yield contents did not increase with the increasing of bleaching duration from 4 h to 12 h. X-ray diffraction (XRD) analysis revealed that the crystallinity and the 200 peak of OPEFB had increased after the bleaching process. Analysis of the visible light transmittance of cellulose, after a bleaching duration of 12 h, demonstrated the highest transmittance due to the disintegration of the fibers. By increasing the bleaching duration, the temperature at 50% weight loss of OPEFB increased, suggesting that the thermal stability of cellulose had improved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Conditions on Cellulose from Oil Palm Empty Fruit Bunch Fiber

Ching

2014

BioRes

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“…Esta estabilidade está relacionada com a presença de cargas negativas (grupos sulfatos) na superfície dos NCCB, ocasionando equilíbrio eletrostático decorrente das forças de repulsão entre os nanocristais [21].…”

Section: Análise De Espalhamento Dinâmico De Luz (Dls) Dos Nccbunclassified

Nanocristais de celulose bacteriana: da obtenção, sob diferentes condições de hidrólise, à incorporação como reforço em poli(L-ácido láctico)

et al. 2018

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RESUMOEste trabalho almejou produzir celulose bacteriana (CB), obter nanocristais de celulose bacteriana (NCCB), incorporar NCCB como reforço em poli(L-ácido láctico) (PLLA) e avaliar propriedades destes bionanocompósitos. Foram produzidas membranas de CB provenientes da bactéria Gluconacetobacter hansenii. A partir das membranas foram obtidos NCCB por hidrólise com ácido sulfúrico (H 2 SO 4 ), com base em 11 experimentos. Os parâmetros variados nos experimentos foram: concentração de H 2 SO 4 , temperatura e tempo. Pode-se definir critérios de obtenção de NCCB por análise termogravimétrica (TGA) e análise de espalhamento dinâmico de luz (DLS). Principais resultados indicam possibilidade de obtenção na condição de: 80% de concentração de H 2 SO 4 (m/m), 60 ºC e 60 min. Para esta condição obteve-se tamanhos adequados dos NCCB (média de 388 nm), potencial zeta adequado (-38 mV) e estabilidade térmica adequada (T onset2 = 301,9 ºC). Posteriormente, NCCB obtidos conforme critérios definidos foram incorporados ao PLLA em duas concentrações (2,5 e 5%), utilizando dois métodos (sem e com funcionalização dos NCCB). Os bionanocompósitos preparados foram caracterizados por TGA e calorimetria explanatória diferencial (DSC). Resultados das técnicas de caracterização dos bionanocompósitos foram comparados com resultados do PLLA puro. Principais resultados em relação aos métodos, revelam a importância da funcionalização dos NCCB antes de incorporá-los ao PLLA. Sobre a concentração de reforço utilizada, o aumento da estabilidade térmica foi gradual, conforme teor de reforço, sendo que para o bionanocompósito com 5% de NCCB funcionalizados o incremento foi de 10,4 ºC na T onset2 em relação ao PLLA puro. Contudo, o grau de cristalinidade diminuiu (X c do PLLA puro = 40,38% e X c do bionanocompósito com 5% de NCCB funcionalizados = 24,73%). Conclui-se que a adição de NCCB em PLLA é ambientalmente viável e promove melhoria de propriedades.Palavras-chave: bionanocompósitos, nanocristais de celulose bacteriana, poli(L-ácido láctico). ABSTRACTThis work aimed to produce bacterial cellulose, to obtain bacterial cellulose nanocrystals, to incorporate nanocrystals as a reinforcement in poly(L-lactic acid) and to evaluate the properties of these bionanocomposites. Bacterial cellulose membranes from the bacterium Gluconacetobacter hansenii were produced. From the membranes were obtained nanocrystals by hydrolysis with sulfuric acid (H 2 SO 4 ), based on 11 experiments. The parameters varied in the experiments were: concentration of H 2 SO 4 , temperature and COSTA, J.F.; GARCIA, M.C.F.; APATI, G.P., et al. revista Matéria, Suplemento , 2017. time. It is possible to define criteria for obtaining nanocrystals by thermogravimetric analysis and analysis of dynamic scattering of light. Main results indicate the possibility of obtaining in the condition of: 80% concentration of H 2 SO 4 (m/m), 60 °C and 60 min. For this condition, suitable sizes of the nanocrystals (mean 388 nm), suitable zeta potential (-38 mV) and adequate thermal stability...

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“…Mercerized flax yarns on acid treatment and neutralization with alkali yielded nanocellulose. The PLA composites with these nanofibers showed significant increase in tensile strength and modulus whereas elongation at break was decreased with fiber content [23]. Cherian & co-workers used pineapple leaf fiber (PALF) to extract nanocellulose by chemical as well as mechanical process.…”

Section: Extraction Micro-and Nanocellulosementioning

confidence: 99%

A Brief review on extraction of nanocellulose and its application

Giri

Adhikari

2012

BIBECHANA

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Cellulose is one of the most abundant renewable natural resources. With the advent of nanotechnology, the interests of cellulose scientists have diverted towards the extraction of nanocellulose from various plant sources and utilize them in technical applications. The reason behind the rapid progress in the nanocellulose chemistry and engineering lies in the promising properties of the nanocellulose and the products thereof. In fact, nanocelluloses combine the important properties of cellulose with amazing features of nanoscale materials. With the perspective of potential of cellulosic materials production in Nepal basically from agricultural wastes and uses in several applications such as in the preparation of biomaterials, this paper reviews the current knowledge in research and development of nanocelluloses in particular for biomedical applications. After the introduction to the chemical constitution and microfibrillar arrangement of nanocellulose in the cellulose bundles together with other constituents, the ways of preparation of nanocellulose and its functionalization approaches will be discussed. Finally, the application of nanocellulose for preparing biomaterials scaffolds will be introduced

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Characterisation of solution cast cellulose nanofibre – reinforced poly(lactic acid)

Cited by 137 publications

References 17 publications

Effect of Preparation Conditions on Cellulose from Oil Palm Empty Fruit Bunch Fiber

Effect of Preparation Conditions on Cellulose from Oil Palm Empty Fruit Bunch Fiber

Nanocristais de celulose bacteriana: da obtenção, sob diferentes condições de hidrólise, à incorporação como reforço em poli(L-ácido láctico)

A Brief review on extraction of nanocellulose and its application

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