A review of bast fibres and their composites. Part 1 – Fibres as reinforcements

Summerscales, John; Dissanayake, Nilmini P. J.; Virk, Amandeep Singh; Hall, Wayne

doi:10.1016/j.compositesa.2010.06.001

Cited by 578 publications

(342 citation statements)

References 35 publications

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“…El H 2 SO 4 por su parte actúa en la hidrólisis de la hemicelulosa, oxalato de calcio y los fructoligosacáridos según lo reportado por Summerscales et al (2010). La diferencia presentada con el FACT bajo tratamiento acido-álcali con presión, se debe al efecto dual de la acción del ácido-álcali y la presión, lo cual generó una hidrólisis de la celulosa.…”

Section: Chemical Compositionunclassified

“…La señal de 1 640 cm -1 está relacionada con la absorción de agua aumentando su intensidad ligeramente en el FACT ácido-álcali sin presión, mientras que en FACT ácido-álcali con presión esta intensidad disminuyó fuertemente. Esto concuerda con On the other hand, H 2 SO 4 acts in the hydrolysis of the hemicellulose, calcium oxalate and the fructooligosaccharides according to what was reported by Summerscales et al (2010). The difference presented with the TAF under acidalkali treatment with pressure is due to the dual effect of the action of the acid-alkali and the pressure, which generates a hydrolysis of the cellulose.…”

Section: Espectroscopia Infrarroja (Ir-ft) Y Análisis Termogravimétriunclassified

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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: Chemical Compositionunclassified

Section: Espectroscopia Infrarroja (Ir-ft) Y Análisis Termogravimétriunclassified

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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“…Os compósitos fabricados com fibras alinhadas de curauá demostraram que com a elevação do nível de vácuo de 53,3 kPa para 101,3 kPa, obteve-se um ganho no limite de resistência à tração de 22,2%. Frequentemente fibras naturais reforçando compósitos de matriz polimérica apresentam fraca adesão fibra/matriz [7], necessitando de tratamento superficial que modifique a superfície da fibra, alterando principalmente sua rugosidade [8,9]. A natureza inerentemente polar e hidrofílica das fibras lignocelulósicas e as características apolares da maioria dos polímeros resultam em uma interação ineficiente na interface [10], constituindo o ancoramento mecânico como o principal mecanismo de adesão fibra/matriz em compósitos reforçados com fibras naturais.…”

Section: Tabelaunclassified

Compósitos poliméricos reforçados com fibras naturais da Amazônia fabricados por infusão

Rodrigues¹,

Souza²,

Fujiyama³

2015

Matéria (Rio J.)

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RESUMOO desenvolvimento de compósitos reforçados com fibras naturais se alia à nova lógica do desenvolvimento sustentável e potencializa a produção de materiais ambientalmente corretos. A chave para tornar economicamente viável e ambientalmente favoráveis estes novos materiais passa pela adaptação de técnicas consagradas de fabricação de compósitos às propriedades peculiares e intrínsecas das fibras naturais, como o processo de infusão, que por se tratar de um processamento em molde fechado contribui para a redução das emissões de voláteis ao meio ambiente na etapa de fabricação. Neste trabalho estudaram-se como as principais variá-veis do processo de infusão afetam as propriedades do compósito quando são utilizadas fibras naturais como reforço de uma matriz de poliéster insaturado. Produziram-se placas reforçadas com fibras de curauá, juta e palha da costa arranjadas na forma de fios alinhados ou tecido em estilo plano sob diferentes níveis de vácuo no processamento. A elevação do nível de vácuo altera a condição de compactação das fibras modificando sua porosidade, interface fibra/matriz e consequentemente as propriedades do compósito. Os compósitos foram caracterizados quanto à sua resistência à tração, módulo de elasticidade, impacto Charpy e porosidade. Os resultados mostraram que o processo de infusão possibilitou a fabricação de compósitos com até 45% de fração volumétrica de fibra, com porosidade em torno de 2% e excelente estabilidade dimensional. Verificouse ainda que, no geral, a elevação do nível de vácuo alterou significativamente as condições de compactação dos reforços, alterando, a depender da estrutura da fibra utilizada, a eficiência da interface matriz/reforço. Palavras-chave: infusão, curauá, juta, palha da costa. ABSTRACTThe development of composites reinforced with natural fibers is allied to the new logic of sustainable development and enhances the production of environmentally friendly materials. The key to making economically viable and environmentally friendly these new materials involves the adaptation of standard techniques of composites manufacturing to the peculiar and intrinsic properties of natural fibers, such as the infusion process which in function to be a closed mold processing helps reduce of volatile emission to the environment at the fabrication stage. In this work we have been studied as the primary variables of the infusion process affect the properties of the composite when natural fibers are used as reinforcing an unsaturated polyester matrix. They were produced plates reinforced with curaua fibers, jute and raffia arranged in form of aligned fibers or fabric in plain style under different vacuum levels in processing. The increase in the vacuum level changes the fiber compaction condition modifying its porosity, fiber / matrix interface and consequently composite properties. The composites were characterized for its tensile strength, elastic modulus, Charpy impact and porosity. The results showed that the infusion process enabled the manufacture of composites with up t...

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“…Pectin is a collective name for heteropolysaccarides and gives plants flexibility. Waxes consist of different types of alcohols [17,20]. Wax and oil are substances on fibre surface used to protect fibre [18].…”

Section: Compositions Of Natural Fibres and Its Effects On Degradationmentioning

confidence: 99%

A review on the degradability of polymeric composites based on natural fibres

et al. 2013

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The applications of natural fibre/polymer composites in civil engineering are mostly concentrated on non-load bearing indoor components due to its vulnerability to environmental attack. This paper evaluates the characteristics of several natural fibre composites exposed to moisture, thermal, fire, and ultraviolet degradation through an extensive literature review. The effects of chemical additives such as fibre treatments, fire retardants and UV stabilizers are also addressed. Based on the evaluation conducted, optimum fibre content provides strength in a polymer composite but it also becomes an entry point for moisture attack. Several fibre treatments are also being used to improve fibre/matrix interface, thereby increasing moisture durability. However, the treated fibres were found to behave poorly when exposed to weather. The addition of UV stabilizers and fire retardants are suggested to enhance outdoor and fire performance of natural fibre/polymer composite but compromises its strength. Therefore, from the collected data and various experimental results, it was concluded that an optimum blend ratio of chemical additives must be employed to achieve a balance between strength and durability requirements for natural fibre composites. Dear EditorI would like to submit a paper entitle of "Degradability of Polymeric Composites Based on Natural Fibres" to the materials and design. This paper address important issues related to the degradation of natural fibres in polymeric composites. I believe the paper has interest to the reader of the journal and will be beneficial for many researchers in the field of materials and design considering the degradation of polymer and bio-materials. I would like to confirm that the paper has not been sent to any journal before and not under review. I hope you can send the paper fore reviewing process. Editor: Thank you for submitting your review paper. There are no technical issues. However, there are areas of the paper that need attention as follows: 1.Include more keywords -you are allowed up to 6 keywords.The keywords have been updated and highlighted in the revised version as Keywords: natural fibres; polymer composites; civil applications; characteristics degradation; weathering. 2.Include your personal university telephone number in the contact details in the paper.In the revised version it has been included as Reference 20 is incomplete. Updated 10.Reference 37 is incomplete. Updated 11.Reference 40 is incomplete. This paper is much related to the topic and it is in press. I added the DOI: 10.1080/15440478.2012.733149 . this is accepted in the production stage 12.Reference 65 is incomplete. Removed 13.In view of the above, please check all references for accuracy and completeness. Detailed Response to Reviewers JMAD-D-12-03220R1 2All the references are cited using endnote software. This makes it easy to update and cite the references in the required format at the publication stage. 14. Remove page numbers from list of table and figure captions. Page numbers removed...

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A review of bast fibres and their composites. Part 1 – Fibres as reinforcements

Cited by 578 publications

References 35 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

Compósitos poliméricos reforçados com fibras naturais da Amazônia fabricados por infusão

A review on the degradability of polymeric composites based on natural fibres

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