Mechanical Properties, Water Absorption, and Chemical Resistance of Napier Grass Fiber Strand–Reinforced Epoxy Resin Composites

Kommula, Venkata P.; Reddy, K. Obi; Shukla, Mukul; Marwala, Tshilidzi; Rajulu, A. Varada

doi:10.1080/1023666x.2014.954186

Cited by 36 publications

(25 citation statements)

References 23 publications

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“…Epoxy resins are the most important thermosetting resins, used widely in industry, which exhibits low shrinkage, good mechanical and thermal properties, and excellent adhesion to a variety of substrate materials . The major drawback of the cured epoxy systems is its brittle nature, exhibiting poor resistance to impact and crack propagation .…”

Section: Introductionmentioning

confidence: 99%

Unsaturated polyester-toughened epoxy composites: Effect of sisal fiber on thermal and dynamic mechanical properties

Paluvai

Mohanty

Nayak

2015

J Vinyl Addit Technol

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In the present study, the mechanical and thermal properties of sisal fiber-reinforced unsaturated polyester (UP)-toughened epoxy composites were investigated. The sisal fibers were chemically treated with alkali (NaOH) and silane solutions in order to improve the interfacial interaction between fibers and matrix. The chemical composition of resins and fibers was identified by using Fourier-transform infrared spectroscopy. The UP-toughened epoxy blends were obtained by mixing UP (5, 10, and 15 wt%) into the epoxy resin. The fiber-reinforced composites were prepared by incorporating sisal fibers (10, 20, and 30 wt%) within the optimized UP-toughened epoxy blend. Scanning electron microscopy was used to analyze the morphological changes of the fibers and the adhesion between the fibers and the UP-toughened epoxy system. The results showed that the tensile and flexural strength of (alkalisilane)-treated fiber (30 wt%) -reinforced composites increased by 83% and 55%, respectively, as compared with that of UP-toughened epoxy blend. Moreover, thermogravimetric analysis revealed that the (alkali-silane)-treated fiber and its composite exhibited higher thermal stability than the untreated and alkali-treated fiber systems. An increase in storage modulus and glass transition temperature was observed for the UP-toughened epoxy matrix on reinforcement with treated fibers. The water uptake behavior of both alkali and alkali-silanetreated fiber-reinforced composites is found to be less as compared with the untreated fiber-reinforced composite. J. VINYL ADDIT. TECHNOL., 00:000-000, 2015.

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Section: Introductionmentioning

confidence: 99%

Unsaturated polyester-toughened epoxy composites: Effect of sisal fiber on thermal and dynamic mechanical properties

Paluvai

Mohanty

Nayak

2015

J Vinyl Addit Technol

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“…It was evident that increase in fiber content increased the TS, TM and TST for both RPC and APC composites and the values are highest at 20% fiber content similar results were observed in the literature works. [ 18,33 ] When compared with the RPC composites, the APC composites recorded 15% increase in TS, 11% increase in TM and 2·74% increase in TST at 20% fiber content. At 20 wt%, facilitation of fibers as stress transfer agents in the polymer matrix is attributed to the improvement in tensile properties of the composite.…”

Section: Resultsmentioning

confidence: 99%

“…The importance of mathematical tools to predict the tensile properties of NFC composite was also discussed. Kommula et al [ 18 ] studied the influence of alkali treatment on a bunch of properties of the composite and concluded that improvement in the interfacial adhesion and mechanical properties were the results of the chemical modification. SEM, FTIR, X‐ray analyses, and TGA confirmed the decrease of hemicellulose content and disappearance of few chemical bonds.…”

Section: Introductionmentioning

confidence: 99%

A study on mechanical, structural, morphological, and thermal properties of raw and alkali treated Cordia dichotoma‐polyester composite

Reddy

et al. 2020

Polymer Composites

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Currently, natural fibers used as reinforcement with polymer composite materials is trending among many researchers, due to their significant properties like low density, light weight and biodegradability. One of such fibers is Cordia dichotoma, which are cheap and available in abundance. The Cordia dichotoma ffibers were extracted from its bark using water‐retting process. These unidirectional fibers were reinforced in a polyester matrix, and mechanical properties such as tensile and flexural properties of the resulting composite were determined experimentally. The Cordia dichotoma fibers were alkali treated with 5% NaOH solution to enhance bonding with matrix and the effect of this treatment on properties of the composite were explored. It was observed that 5% NaOH treatment gives considerable improvement in mechanical properties of the composite. FTIR spectroscopy was used to identify the functional groups and chemical compositions of the raw and alkali treated fiber composites. SEM analysis was carried out and resulting images revealed the existence of impurities on the surface of the raw fiber in the composite. Removal of the impurities with alkali treatment of fibers made the surface of the fibers rough and lead to improving the mechanical properties. Further, thermal stability (degradation temperature and weight loss) of raw and alkali treated fiber reinforced composites was studied using TGA.

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“…The results clearly show that the addition of bio-filler has created reinforcing effect which is responsible for the increase in tensile strength. It can be realized that tensile strength (from 24 MPa to 35.56 MPa) and modulus (from 1200 MPa to 1960 MPa) gradually increased with increasing PSP weight content from 5 % to 15 % and alkali treatment with the concentrations from 2, 5 and 7 % than pure epoxy as per literature [17]. It was observed by many researchers that the Young's modulus increases with increase in filler loading [18][19][20][21][22].…”

Section: Tensile Strength Measurementmentioning

confidence: 92%

Mechanical and thermal properties of epoxy composites reinforced with waste peanut shell powder as a bio-filler

et al. 2015

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Bio-filled polymer composites are gradually replacing plastics to achieve the aim of environmental sustainability. Present study has been carried out to prepare the composites made by reinforcing waste peanut shell powder (PSP) as a natural filler into epoxy resin matrix. The natural filler extracted by manual process was subjected to alkali treatment with the concentrations of 2, 5 and 7 w/v%. The composites fabricated by varying the weight fractions of filler in the range of 5 to 15 wt%. The effects of bio-filler content of the composites on tensile and thermal properties were evaluated by Fourier transmission infrared spectroscopy (FTIR), universal testing machine, scanning electron microscope (SEM) and thermal gravimetric analysis (TGA). The studies reveal that the tensile strength and tensile modulus increased with the increasing of bio-filler content. The highest mechanical properties of 7 % alkali treated PSP loaded Epoxy composite were achieved at biofiller mass content of 15 wt.%. The morphology of the composites shows better bonding between the filler and resin, thus leading to improvement of the mechanical properties. The TGA results revealed that the polymer composites showed thermal resistance on increasing NaOH concentration and filler content.

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Mechanical Properties, Water Absorption, and Chemical Resistance of Napier Grass Fiber Strand–Reinforced Epoxy Resin Composites

Cited by 36 publications

References 23 publications

Unsaturated polyester-toughened epoxy composites: Effect of sisal fiber on thermal and dynamic mechanical properties

Unsaturated polyester-toughened epoxy composites: Effect of sisal fiber on thermal and dynamic mechanical properties

A study on mechanical, structural, morphological, and thermal properties of raw and alkali treated Cordia dichotoma‐polyester composite

Mechanical and thermal properties of epoxy composites reinforced with waste peanut shell powder as a bio-filler

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