Natural Fibers and Their Characterization

Azwa, Z. N.; Yousif, B. F.; Manalo, Allan; Karunasena, Warna

doi:10.1201/b19062-3

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…From the literature, it can be concluded that water absorption on the natural fiber‐reinforced composites is a crucial limitation for the product application because natural fiber absorbs more water compared with synthetic fiber . The effect of this absorbed water content is to degrade the mechanical properties . Figure shows the water absorption percentages of roselle fiber‐reinforced vinyl ester with the different chemical treatments of 3%, 6%, and 9% NaOH and a silane coupling agent.…”

Section: Resultsmentioning

confidence: 99%

The effects of chemical treatment on the structural and thermal, physical, and mechanical and morphological properties of roselle fiber‐reinforced vinyl ester composites

et al. 2016

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Roselle fiber is a type of natural fiber that can potentially be used as a reinforcement material in polymer composites for different applications. This study investigated the chemical, physical, thermal, mechanical, and morphological characteristics of roselle fiberreinforced vinyl ester subjected to different fiber treatments. The roselle fiber was treated with alkalization and a silane coupling agent, and samples were prepared using the hand lay-up method. Treated roselle fiber significantly enhanced most of the properties of vinyl ester biocomposites compared with an untreated biocomposite. The results revealed that alkalization and silane treatment of the fiber changed its chemical properties. The treated fiber improved water repellence behavior of the roselle fiber-reinforced vinyl ester compared with the untreated fiber. Use of a silane coupling agent was determined as the best chemical treatment for the water absorption effect. Thermogravimetric analysis (TGA) demonstrated that alkalization-treated fiber had improved thermal stability; however, the opposite result was obtained with the silane-treated fiber. The morphological examination of treated and untreated roselle fiber-reinforced vinyl esters showed a good fiber adhesion between the treated fiber and the matrix, and less fiber pull-out from the matrix was observed. This observation provides good indication of the interfacial interlocking between the fiber and the matrix, which improved the tensile properties of the composites. In contrast, the impact results revealed that the treated fiber had a decreased impact energy compared with the untreated fiber. POLYM. COMPOS.,

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Section: Resultsmentioning

confidence: 99%

The effects of chemical treatment on the structural and thermal, physical, and mechanical and morphological properties of roselle fiber‐reinforced vinyl ester composites

et al. 2016

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“…Lignocellulosic fibers comprise of cellulosic fibrils, bonded together by the noncellulosic content such as lignin, hemicellulose, pectin, and waxes. The behavior of lignocellulosic fibers is significantly influenced by the composition of these binding constituents . However, excessive presence of these on the fiber surface restricts the formation of a good interfacial bond at the fiber–polymer interface.…”

Section: Introductionmentioning

confidence: 99%

Sisal fiber‐reinforced green composites: Effect of ecofriendly fiber treatment

Chaitanya

Singh

2017

Polymer Composites

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This research endeavor explores the effect of economical and environment‐friendly treatment of sisal fibers, prior to their incorporation into poly‐lactic acid (PLA). Biocomposites incorporating sisal fibers (30% [w:w]) treated with sodium bicarbonate (10% [w:v]) aqueous solution for varying time periods (24, 72, 120, and 168 h) were developed using extrusion‐injection molding process. Thermogravimetric analysis, morphological examination, Fourier‐transform infrared spectroscopy, and lignocellulosic composition analysis of raw and treated sisal fibers established a gradual removal of hemicellulosic content from fiber surface with increasing treatment time. Biocomposites incorporating sisal fibers treated for 72 h exhibited optimum tensile, flexural, and compressive properties. While in case of impact testing, biocomposites incorporating sisal fibers treated for 24 h exhibited maximum impact strength. The optimum results were found comparable to sodium hydroxide treated sisal fiber‐reinforced biocomposites. Hence, considering commercialization of biocomposites, sodium bicarbonate treatment offers huge potential to substitute ecologically hazardous sodium hydroxide treatment ensuring good mechanical properties. POLYM. COMPOS., 39:4310–4321, 2018. © 2017 Society of Plastics Engineers

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“…However, the differences in the final thickness gain of these uncoated composite samples are quite close in percentage, the maximum difference being approximately 1%. Higher fibrillation for 8% NaOH-treated fibres is expected due to the high acid strength that erodes the fibrils as studied by Azwa et al 21 Water accommodating within these pores may cause BPC-8 to expand faster The nature of untreated composites containing hemicellulose, lignin and wax influences its moisture absorptivity 10,26 but apparently, water residing within these components caused lower swelling. The coating has provided obvious restrain to swelling as observed on the initial curve of BPC-6C.…”

Section: Resultsmentioning

confidence: 94%

“…19,20 For bamboo fibres, 6 wt% NaOH is considered to be the optimum concentration for alkalisation as studied previously by the authors. 21 Azwa et al 21 has found that the same batch of bamboo fibres used in this study, treated at 6% NaOH resulted in highest single fibre tensile properties and matrix adhesion strength. Similar studies on other natural fibres using proximate concentration of 5% NaOH revealed comparable outcomes, with higher NaOH concentrations causing decrease in the mechanical properties.…”

Section: Introductionmentioning

confidence: 91%

Physical and mechanical properties of bamboo fibre/polyester composites subjected to moisture and hygrothermal conditions

Azwa

Yousif

2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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The widespread use of natural fibre reinforced composites is hindered by a few issues, some related to the durability of the natural fibre itself especially when exposed to certain environmental conditions. In this study, the moisture impact on the physical and mechanical behaviours of bamboo fibre/polyester composites was investigated. Composites fabricated using bamboo fibres and polyester resin were immersed in water at room temperature (25 C) for 60 days and at 80 C for 2 days. The percentage of thickness swelling and surface expansion was recorded throughout the duration of the study, until apparent physical degradation was observed on the samples. At both temperatures, untreated and treated composites had similar swelling behaviour, with 8% NaOH-treated composite showing highest swelling rate. The surface area expansion for all composites was observed to be much lower than in the thickness direction and was relatively negligible. Since the percentage of final swelling was about the same for all composites, it was also found that the composites achieved similar maximum tensile strength for both conditions, with approximately 2% increment at room temperature and 13.6% reduction at 80 C.

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Natural Fibers and Their Characterization

Cited by 4 publications

References 33 publications

The effects of chemical treatment on the structural and thermal, physical, and mechanical and morphological properties of roselle fiber‐reinforced vinyl ester composites

The effects of chemical treatment on the structural and thermal, physical, and mechanical and morphological properties of roselle fiber‐reinforced vinyl ester composites

Sisal fiber‐reinforced green composites: Effect of ecofriendly fiber treatment

Physical and mechanical properties of bamboo fibre/polyester composites subjected to moisture and hygrothermal conditions

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