Mechanical Properties of Coconut Fibers Reinforced Polyester Composites

Mulinari, Daniella Regina; Baptista, Carlos Antônio Reis Pereira; Souza, José Vitor C.; Voorwald, Herman Jacobus Cornelis

doi:10.1016/j.proeng.2011.04.343

Cited by 116 publications

(56 citation statements)

References 9 publications

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“…The crystallinity index (I C ) of the fibers was calculated according to the Segal empirical method as follows [19]: Figure 1a shows the untreated coconut fiber. The coconut fiber surface is rather smooth [10,13]. This indicates that the fiber surface is still filled with impurities or other elements.…”

Section: Methodsmentioning

confidence: 98%

“…Figure 1b-d shows large grain crystallizations whereas in Figure 1e shows small grains merge with each other so it looks sturdy. Alkali treatment makes the roughness of fiber surface very different from the untreated fiber surface [8,10,13]. Increased surface roughness of coconut fiber as the effect of increasing the amount of cellulose exposed [8].…”

Section: Methodsmentioning

confidence: 99%

“…Study on alkali treatment of the coconut fiber has been done by many researches [9,10,11,12]. There was a decrease in the fatigue life for a large stress composite reinforced with coconut fiber treated with sodium hydroxide [13].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, modification of the fiber surface treatment is considered to increase the strength of natural fiber Composite [13,14]. Surface treatment using stearic acid and potassium permanganate other than NaOH provide a better performance than the untreated fibers [14].…”

Section: Introductionmentioning

confidence: 99%

“…However, in this study chemical treatment for coconut fiber was done in three steps, namely first step was NaOH treatment, the second step was KMnO 4 treatment and the third step was H 2 O 2 treatment, with varying concentrations. Moreover, after each step of treatmen, the fiber was immediately dried in an oven without washed with distilled water [13]. The objective of this research is to study the effect of chemical treatment on coconut fiber surface morphology.…”

Section: Introductionmentioning

confidence: 99%

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The morphology of coconut fiber surface under chemical treatment

et al. 2015

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The objective of this study was to determine the effect of chemical treatment on the coconut fiber surface morphology. This study is divided into three stages, preparation of materials, treatment and testing of coconut fiber. The first treatment is coconut fiber soaked in a solution of NaOH for 3 hours with concentration, respectively 5%, 10%, 15%, and 20%. The second treatment is coconut fiber soaked in KMnO 4 solution with a concentration of 0.25%, 0.5%, 0.75%, and 1% for 3 hours. The third treatment is coconut fiber is soaked in H 2 O 2 solution with a concentration of 5%, 10%, 15%, and 20% for 3 hours. At each treatment the fiber is dried in an oven at a temperature of 90 o C for 5 hours. Coconut fibers that had been the first, second, and third treated, sorted out for chemical composition, single fiber tensile and SEM testing. Tensile strength of single coconut fiber was tested following ASTM 3379-02 by using a tensile testing LR10K Plus 10 kN Universal Materials Testing Machine. The fiber surface morphology was examined using electron microscopy Vega3 Tescan Scanning Electron Microscope (SEM) at 5kV voltage, and X-ray diffraction, 30 kV, 15 mA, at scan speed 2.000 deg./min . The result shows that the highest tensile strength of the fiber obtained in the first treatment namely N4. In general the mechanical strength of the fiber decrease slightly however, the fiber surface morphology becomes rough. NaOH treatments cause crystallization on the surface of the fiber. Crystallinity index was decreased with increasing concentration of NaOH. The second treatment caused the trench grooves on the surface of the fiber that can improve bonding between fiber and matrix.

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The morphology of coconut fiber surface under chemical treatment

et al. 2015

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Lignocellulosic Polymer Composites: Processing, Characterization and Properties

Sipião

Reis

Paiva

et al. 2014

Lignocellulosic Polymer Composites

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Natural fi bers-reinforced polymer matrixes provide more alternatives in the materials market due to their unique advantages. Poor fi ber-matrix interfacial adhesion may aff ect the physical and mechanical properties of the resulting composites due to the surface incompatibility between hydrophilic natural fi bers and non-polar polymers. Th e results presented in this chapter focus on the properties of palm and pineapple fi bers in terms of their physical and chemical structure, mechanical properties and processing behavior. Th e fi nal properties of these fi bers with thermoplastics matrixes are also presented, paying particular attention to the use of physical and chemical treatments for the improvement of fi ber-matrix interaction .

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