A review on the characterisation of natural fibres and their composites after alkali treatment and water absorption

Muthukumar, Chandrasekar; Ishak, Mohamad Ridzwan; Sapuan, S.M.; Leman, Zulkiflle

doi:10.1080/14658011.2017.1298550

Cited by 265 publications

(94 citation statements)

References 88 publications

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“…FMOE of the composites improved filling cupula fiber in r‐HDPE matrix due to increasing stiffness. In addition, the alkali treatment with NaOH leads to higher improvement on FMOE of the samples for enhancing compatibility between the filler and polymer by increasing fibrillation of the cupula fiber …”

Section: Resultsmentioning

confidence: 99%

Effect of alkali treatment on composites made from recycled polyethylene and chestnut cupula

2019

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The objective of this study is to investigate the effects of alkali treatment on the mechanical, physical properties of cupula fibers reinforced recycled high density polyethylene (r-HDPE) composites. The composites were produced with different chestnut (Castanea sativa Mill.) cupula fiber contents, up to 50%, and polyethylene-grafted maleic anhydride. The mechanical, physical, thermal, and morphological properties of the treated and untreated samples were investigated. In addition, the Fourier transform infrared spectroscopy (FTIR) was used to observe the interactions and functional groups between cupula fiber and r-HDPE in the composite samples. The alkali treatment with 5 wt% NaOH solution had an affirmative effect on the tensile and flexural properties. It was found that an increase of 20% in flexural strength values with up to 40 wt% alkali treated cupula fiber loading in polymer matrix compared to that of untreated samples. After 5 wt% NaOH treatment, the crystallinity decreased with the increase of the chestnut cupula fiber ratio. As excepted, the FTIR analysis showed that the alkali treatment resulted in removal of hemicellulose, and lignin from cupula fiber.The results revealed that the alkali treated chestnut cupula fiber can be used successfully in polymer composites as a natural fiber filler. K E Y W O R D Scomposites, FT-IR, mechanical properties, polyethylene (PE), waste

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Section: Resultsmentioning

confidence: 99%

Effect of alkali treatment on composites made from recycled polyethylene and chestnut cupula

2019

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“…The water absorption behavior of NFCs depends on various parameters such as the type of fiber and matrix, the fiber content, its length, manufacturing process, the surrounding temperature, and relative humidity. Few studies have been carried out on jute/PP composites studying the effect of fiber volume fraction on diffusion coefficient and diffusion process in salt water environment . The water diffusion phenomenon in the NFC is commonly modeled using Fick's diffusion law .…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical treatment on mechanical properties and water diffusion characteristics of jute‐polypropylene composites

et al. 2019

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This work presents the effect of chemical treatment of short jute fibers using alkali, potassium permanganate, and silane treatment on the mechanical properties of jute‐polypropylene (PP) composites. The chemically treated jute fibers were compounded at 30% weight fraction with PP granules in twin‐screw extruder, and the composite pellets were later injection molded to obtain the specimens for the study. The optimum parameters for the respective chemical treatments used in this study were followed as per the literature. The effectiveness of the chemical treatment carried out was studied using Fourier transform infrared spectroscopy and scanning electron microscopy. The mechanical characterization comprising tensile test, flexural test, impact test, and microhardness test were conducted on jute‐PP composites. In addition, the effect of chemical treatment on the water absorption kinetics of the jute‐PP composites was studied. The diffusion coefficient of the jute‐PP composite was determined using the approximate solution of Fick's model. The silane‐treated jute‐PP composites show an increase in tensile strength, tensile modulus, and flexural modulus by nearly 6%, 22%, and 20%, respectively, compared to untreated jute‐PP composite. The moisture absorption study reveals that the silane‐treated jute‐PP composite is the most effective.

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“…Recently, natural fibers such as cotton, flax, jute, sisal and hemp are also becoming more attractive than synthetic fibers because of their natural abundance, low cost, low density, good mechanical properties, nontoxicity, etc. [1,2,3,4]. For example, abaca fibers have been widely studied as a reinforcement in cement [5], polypropylene [6,7] and epoxy [8] matrices, among others.…”

Section: Introductionmentioning

confidence: 99%

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

2017

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The use of natural fibers in reinforced composites to produce eco-friendly materials is gaining more attention due to their attractive features such as low cost, low density and good mechanical properties, among others. This work thus investigates the potential of waste abaca (Manila hemp) fiber as reinforcing agent in an inorganic aluminosilicate material known as geopolymer. In this study, the waste fibers were subjected to different chemical treatments to modify the surface characteristics and to improve the adhesion with the fly ash-based geopolymer matrix. Definitive screening design of experiment was used to investigate the effect of successive chemical treatment of the fiber on its tensile strength considering the following factors: (1) NaOH pretreatment; (2) soaking time in aluminum salt solution; and (3) final pH of the slurry. The results show that the abaca fiber without alkali pretreatment, soaked for 12 h in Al2(SO4)3 solution and adjusted to pH 6 exhibited the highest tensile strength among the treated fibers. Test results confirmed that the chemical treatment removes the lignin, pectin and hemicellulose, as well as makes the surface rougher with the deposition of aluminum compounds. This improves the interfacial bonding between geopolymer matrix and the abaca fiber, while the geopolymer protects the treated fiber from thermal degradation.

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A review on the characterisation of natural fibres and their composites after alkali treatment and water absorption

Cited by 265 publications

References 88 publications

Effect of alkali treatment on composites made from recycled polyethylene and chestnut cupula

Effect of alkali treatment on composites made from recycled polyethylene and chestnut cupula

Effect of chemical treatment on mechanical properties and water diffusion characteristics of jute‐polypropylene composites

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

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