Effects of the surface treatments of lignocellulosic fibers on their debonding stress

Mani, Purusothaman; Satyanarayana, K. G.

doi:10.1163/156856190x00036

Cited by 22 publications

(13 citation statements)

References 7 publications

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“…These structures contain reactive functional groups that are capable of bonding to the reactive groups in the matrix polymer. Thus modification of natural fibers is attempted to make the fiber hydrophobic and to improve interfacial adhesion between the fiber and the matrix polymer [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71] . Chemical treatment of natural fibers has been reviewed where it reported 58 that such as de-waxing (de-fatting), de-lignifications, bleaching, acetylation, cynoethylation 72 , and chemical grafting were used for modifying the surface properties of the fibers for enhancing its performance.…”

Section: Modification Of Natural Fibersmentioning

confidence: 99%

Environment Friendly Composite Materials: Biocomposites and Green Composites

Mitra

2014

DSJ

166

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IntroductIonDevelopment of advanced polymer composite materials having superior mechanical properties opened up new horizons in the engineering field. Advantages such as corrosion resistance, electrical insulation, easy processability at relatively less energy requirement in tooling and assembly costs, higher stiffness and strength, fatigue resistance and lower weight than metals have made polymer composite widely acceptable in structural applications. The so-called advanced composites have replaced metals because of their excellent mechanical properties and low density giving them high specific strength and stiffness 1 . Such weight savings are highly desirable for applications in aerospace to transportation to reduce weight and associated fuel consumption. Another distinct advantage is their ability to be engineered to obtain required properties in different directions by appropriate fiber placing in different layers of the laminated structure.Composite properties depend on the properties of the constituent materials i.e. the fibers and resins used. The strength and stiffness of the composites are directly a function of the reinforcing fiber properties which carry most of the load and their volume content. The resin helps to maintain the relative position of the fibers within the composite and, more importantly, transfers the load from the bottom fibers to the intact fibers. As a result, fiber/resin interfacial properties are also important and have a significant effect on composite properties including toughness and transverse fracture stress. To fabricate high strength composites, all three factors namely fiber properties, resin properties as well as fiber/resin interface characteristics are critical.Currently most of the fibers and resins are derived from petroleum feed stocks and do not degrade for several decades under normal environmental conditions 2 . Composites made from thermosetting resins cannot be reprocessed or recycled, however, a small fraction of these thermosetting composites are crushed into powder used as filler or incinerated to obtain energy in the form of heat, most of them end up in land-fills at the end of their life. In anaerobic conditions, such as those in land -fills, the petroleum based composites may not degrade making that land unavailable for any other use. On the other hand, incineration produces toxic gases and requires expensive scrubbers. Both incineration and dumping in land-fills are environmentally undesirable as well as expensive. In the future, these methods of disposing of composites are expected to get even more expensive as the pollution laws all over the world get stricter and the number of land -fills decline. In addition, at the present rate of consumption, the world petroleum resources are estimated to last for the next 50 years or so 2 . Thus, there is a great interest generated in developing green composites using fully sustainable, biodegradable, environment friendly and annually renewable fibers and resins, particularly those derived from plants 3 . A variet...

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Section: Modification Of Natural Fibersmentioning

confidence: 99%

Environment Friendly Composite Materials: Biocomposites and Green Composites

Mitra

2014

DSJ

166

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“…Many researchers used typical pullout rates between 1 and 5 mm/min to pullout synthetic and natural fibres, (e.g. coconut, sisal, banana and betelnut fibres from the matrix (cement paste, polyethylene or polyester) [15][16][17][18][19][20][21]. The higher the pullout rate, the higher the probability that a fibre may break during pullout.…”

Section: Introductionmentioning

confidence: 99%

“…The crosssection of sisal fibres are assumed to be circular with diameters d ranging from 200 to 300 lm. Mani and Satyanarayana [17] found that the combined use of sodium alginate and calcium chloride effectively improved the interfacial bond strength between coconut fibres and polyester by 11%. When coconut fibres were pretreated with 5% NaOH [17], the bond strength between fibres and polyester was improved by 6.6%.…”

Section: Introductionmentioning

confidence: 99%

“…These pre-treatments can be achieved by physical and chemical modifications of fibre surfaces [5,7,[15][16][17][18][19][20][21]23,24]. An easy-to-use and cheap chemical adopted by some researchers was sodium hydroxide for treating coconut fibres [5,7,17,23]. Gu [5] treated brown coconut fibres by NaOH solution with concentrations from 2% to 10% and found that the fibre tensile strength decreased with treatment of increasing NaOH con- centration.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations on bond strength between coconut fibre and concrete

2013

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“…The combined use of sodium alginate and calcium chloride effectively improved the ultimate tensile strength of fibres by 18% (13). Sodium alginate is a weak acidic food gel while calcium chloride is almost neutral, both of them are safe to use and are environmentally friendly.…”

Section: New Cost-saving and Environmental-friendly Construction Matementioning

confidence: 99%

Use of coconut fibre reinforced concrete and coconut-fibre ropes for seismic-resistant construction

Ali¹

2016

Mater. construcc.

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Earthquake-resistant and economical housing is the most desirable need in rural areas of developing countries. These regions often suffer significant loss of life during a seismic event. To enable an efficient and cost-effective solution, a new concept of construction, i.e. a wallette of interlocking blocks with movability at the interface and rope reinforcement, is investigated. The novel interlocking block is made of coconut fibre reinforced concrete (CFRC). The reason for using coconut fibre is their highest toughness amongst natural fibres. This paper describes the in-plane behaviour of the interlocking wallette under earthquake loadings. The wallette response is measured in terms of induced acceleration, block uplift, top maximum relative displacement and rope tension. The applied earthquake loadings cannot produce any damage in the structure, i.e. blocks and/or ropes. The response of the wallette is explained in detail along with correlation of materials aspect with structural behaviour. RESUMEN: Uso de hormigón reforzado con fibras de coco para construcciones sismo resistentes.En las zonas rurales de los países en desarrollo, entre las características principales que deben reunir las viviendas es que sean tanto económicas como sismoresistentes, ya que en estas zonas la pérdida de vidas humanas debido a los terremotos es aun elevada. A fin de hallar una solución que cumple con estos requisitos de manera técnica y económicamente efectiva, se ha investigado un nuevo concepto constructivo: un murete de bloques conjugados con movilidad en el interfaz y reforzado con cuerda. Este novedoso bloque conjugable está realizado en hormigón reforzado con fibra de coco (CFRC), elegida por su alta tenacidad, la mayor de entre las fibras naturales. El artículo describe el comportamiento dentro del plano del murete conjugado frente a las cargas sísmicas. La respuesta de esta estructura se ha medido en función de la aceleración inducida, el levantamiento de los bloques, el desplazamiento relativo máximo y la tensión de las cuerdas, determinándose que ni los bloques ni las cuerdas han resultado dañados por las cargas sísmicas aplicadas. La respuesta del murete se describe en detalle, relacionando las propiedades de los materiales con su comportamiento estructural.

show abstract

Effects of the surface treatments of lignocellulosic fibers on their debonding stress

Cited by 22 publications

References 7 publications

Environment Friendly Composite Materials: Biocomposites and Green Composites

Environment Friendly Composite Materials: Biocomposites and Green Composites

Experimental investigations on bond strength between coconut fibre and concrete

Use of coconut fibre reinforced concrete and coconut-fibre ropes for seismic-resistant construction

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