Static, dynamic mechanical and thermal properties of untreated and alkali treated mulberry fiber reinforced polyester composites

Shanmugasundaram, N.; Rajendran, I.; Ramkumar, T.

doi:10.1002/pc.24890

Cited by 44 publications

(36 citation statements)

References 43 publications

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“…The alkali treatment removes the hydroxyl ions from the cell wall of cupula fibers resulted in increased rougher surface and deeper pores. This provides obtaining the mechanical properties and increasing the amount of cellulose exposed on the alkali treated fiber surface resulted in the number of possible reaction sites . The surface of the alkali treated cupula fiber added composite had coarser than compared to untreated cupula fiber as reported in some researches …”

Section: Resultsmentioning

confidence: 86%

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: 86%

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

2019

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“…All the composites were brittle. This may be due to agglomeration of the sand particles and reduction in the interfacial bonding between matrix and sand [26].…”

Section: Tensile Properties Of the Compositesmentioning

confidence: 99%

Influence of Alkali Treatment and Dune Sand Content on the Properties of Date Palm Fiber Reinforced Unsaturated Polyester Hybrid Composites

Meftah¹,

Tayefi²,

Fellouh³

et al. 2020

RCMA

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The effects of alkali treatment and dune sand (DS) addition on the mechanical, morphological, thermal and water absorption behavior of date palm fiber (DPF) reinforced unsaturated polyester (UP) composites were investigated. The composites were synthesized by hand lay-up method with 10, 20, and 30 wt% of both treated and untreated date palm fiber (TDPF/DPF). Furthermore, composites having 10, 20 and 30 wt% of untreated date palm fiber and dune sand (both of them were in equal wt%) were also fabricated. Alkali treatment improved the tensile strength, tensile modulus, flexural strength and flexural modulus of the resulting composites. Scanning electron microscopy (SEM) revealed the better interfacial interaction of treated date palm fibers/UP composites. Thermogravimetric analysis (TGA) showed that thermal stability, and degradation temperature of treated DPF composites were best over the untreated DPF composites. Water absorption test indicated the decreasing of hydrophilic character of the filler after treatment with sodium hydroxide (NaOH). Overall analysis represented that satisfactorily improved physical properties of UP for various engineered and hi-tech applications were obtained with 10 wt% fillers loading (5 wt% date palm fiber and 5 wt% dune sand particles).

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“…Libo Yan et al [ 16 ] also reported that 5% alkali treatment makes the coir fiber surface clear, rough, and also improves the strength of the polymer composites. Shanmugasundaram et al [ 33 ] studied the effect of alkali treatment (5%, 10%, 15%) on the physical, thermal, mechanical, and chemical properties of Areca palm leaf stalk fiber and they concluded that alkali treatment removes the hemicellulose and waxy substances from the fibers whereas the 5% alkali‐treated fibers showed improvement in the mechanical properties of the polymer composites. Among different types of surface treatments, NaOH treatment was most commonly used for enhancing the compatibility of natural fibers with the matrix.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, ballistic impact, and water absorption behavior of luffa/graphene reinforced epoxy composites

KG¹,

Kalaichelvan

2020

Polymer Composites

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The mechanical, ballistic, and moisture intake properties of luffa fiber reinforced with graphene-modified epoxy composites were experimentally investigated. The nanofiller graphene particles were modified with a matrix using the mechanical stirring process. The filler (graphene) of size 20 nm is modified with the matrix of different weight percentages 0, 1, 2, 3, and 4. The samples for various testings were prepared with different compositions using a hand layup technique followed by compression molding. The results show that tensile, impact, and flexural strength were enhanced with the modification of the filler graphene up to 2 wt%. The ballistic impact results show that energy absorption increases with nanofiller modification. Minimum water intake behavior is observed for the composite samples incorporated with fillers. Failure mechanisms were studied on tensile tested specimens using a scanning electron microscopy. The morphological images showed defects like interfacial behavior, fiber pull out, voids, and internal cracks on the tested specimens. K E Y W O R D S ballistic impact behavior, composite material, graphene, Luffa cylindrica, mechanical properties 1 | INTRODUCTION Owing to their ecofriendly character, low cost, and availability, natural fibers created interest among researchers for producing sustainable polymer composites. [1] As the world is focusing on reducing the effect of greenhouse gasses in the atmosphere, the demand for using natural fibers as reinforcements increased. [2,3] Inorganic fibers like carbon, aramid, and glass fibers have good attractive properties that make them ideal for use as reinforcements in polymer composites. [4] Nevertheless, synthetic fibers suffer from nonbiodegradability, high cost, and hazardous gasses during disposal, which made researchers find new alternative materials. [5] Hence, they tried to use natural fibers as alternative materials to overcome the problems of using synthetic fibers. [4,6] Natural fibers like sisal, [7] banana, [8-11] jute, [12-14] coir, [15,16] luffa, [17,18] hemp [19] and flax, [9,20] and so forth are most commonly used as reinforcements in polymer composites and those materials were used in various interior applications such as furniture, acoustics, vibration isolation, packaging, automobile industries, aeronautical, and marine sectors. [21,22] Their hydrophilic nature reduced compatibility, reinforcing effect, and stress transfer with polymer matrices made the natural fiber composites fit for use in light load and interior applications. The properties and quality of composites depend on the degree of compatibility between the matrix and natural fiber. [23-25] To enhance the bonding between the matrix and fibers researchers used different methods, one of which is surface treatments. Generally, surface treatments like alkali, [3,6,26-28] silane, [29,30] benzoylation treatment, [6,31] and so forth are used for treating the fiber surface. Tolera A. Negawo et al [32] studied the influence of alkali

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Static, dynamic mechanical and thermal properties of untreated and alkali treated mulberry fiber reinforced polyester composites

Cited by 44 publications

References 43 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

Influence of Alkali Treatment and Dune Sand Content on the Properties of Date Palm Fiber Reinforced Unsaturated Polyester Hybrid Composites

Mechanical, ballistic impact, and water absorption behavior of luffa/graphene reinforced epoxy composites

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