Sisal fibril epoxy composite—a high strength electrical insulating material

Nimanpure, Subhash; Hashmi, S. A. R.; Kumar, Rajnish; Nigrawal, Archana; Bhargaw, Hari Narayan; Naik, Ajay

doi:10.1002/pc.24527

Cited by 8 publications

(13 citation statements)

References 43 publications

(46 reference statements)

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“…The mechanical, electrical, and thermal properties of the hybrid composites were studied. The following conclusions can be drawn: 1. The mechanical strength of sisal fibril/kenaf fiber hybrid polyester composites improved due to the hybridization of sisal fibrils with kenaf fibers.…”

Section: Discussionmentioning

confidence: 99%

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Mechanical, electrical, and thermal analysis of sisal fibril/kenaf fiber hybrid polyester composites

et al. 2017

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A novel hybrid composition of sisal fibrils and kenaf fibers has been introduced first time as reinforcement in composite preparation for the environmental friendly high strength electrical insulation applications. Hybrid reinforcement was increased from 10 to 40 wt% in unsaturated polyester resin. The sisal fibril used in this study was extracted from sisal fiber. Alkali treatment was employed and FTIR analysis was done to study its effect on sisal fibrils and kenaf fibers. A positive hybridization effect was observed for the composites. Hybrid composite showed 24 and 18% increase in tensile strength, 30 and 36.4% increase in flexural strength, and 196.3 and 196% increase in impact strength as compared to the composites having same loading of 40 wt% with sisal fibrils and kenaf fibers, respectively. Scanning electron microscopy of the fractured mechanical testing samples was carried out to understand the nature of fibril/fiber/matrix interface. Electrical characterization showed high electrical insulation capability of the hybrid composites. Thermal stability of hybrid composites was also found higher than sisal fibrils and kenaf fibers reinforced composites. A comparative study of properties of sisal fibril/kenaf fiber reinforced hybrid polyester composites with various single and hybrid fiber composites is done. It has been concluded that the developed novel hybrid composite has the potential to replace various existing natural and synthetic fiber composites. POLYM. COMPOS., 40:664–676, 2019. © 2017 Society of Plastics Engineers

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Section: Discussionmentioning

confidence: 99%

“…Sisal fibers are extracted from the leaves of the plant and kenaf fibers are the bast fibers. The intrinsic properties of sisal fibers, kenaf fibers, and sisal fibrils are given in Table . High cellulose content of sisal fibers impacts high tensile properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, electrical, and thermal analysis of sisal fibril/kenaf fiber hybrid polyester composites

et al. 2017

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“…Filler with larger band gap would lead to its lower conductivity under applied field, meaning smaller conductivity difference between filler and epoxy resin matrix. Epoxy matrix had high insulation and rather low conductivity 13 . In this case, weaker interface polarization (Maxwell-Wagner-Sillars polarization) 14 would be formed between filler and matrix, resulting in lower permittivity of cured composite sample.…”

Section: Resultsmentioning

confidence: 99%

High-performance ceramic/epoxy composite adhesives enabled by rational ceramic bandgaps

2020

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High over-all properties, including low dielectric loss, high breakdown strength, high mechanical shock strength, high thermal conductivity and high weight stability, are very difficult to simultaneously achieve in electrical-insulation applicable cured potting-adhesive materials. to deal with this challenge, in this work, we have designed and fabricated a series of epoxy based composite potting-adhesives filled with low-cost and high-performance inorganic micro-particles including alpha-silica, alphaalumina and alpha-Sic. combination employment of high-molecular-weight and low-molecular-weight epoxy resins as matrices has been made. Heat-induced curing or crosslink of resin matrices has been carried out. Large band gap of silica filler has endowed the cured composite with high breakdown strength and ageing breakdown strength, and meanwhile relatively high deformation trait of silica has led to high shock strength of cured composite. Silica filler has been found to be superior to other two fillers, namely, optimal over-all properties such as dielectric, breakdown, mechanical and thermal features have been obtained in silica filled cured composite. High breakdown strength of ~48 MV m −1 and shock strength of ~9950 J m −2 have been achieved in silica loaded composite. this work might open up the way for large-scale fabrication of promising epoxy-based hybrid potting-adhesives.Recently, potting adhesive materials with promising electrical, mechanical and thermal properties have triggered general attention and research interest in the field of fabricating aerospace applicable special power supplies 1 . Inorganic particles filled polymer based hybrid potting adhesives are consisting of polymer matrix, curing-agent, curing boosting agent, plasticizer, thermally conductive filler, reactive diluent and demoulding agent 2 . Plenty of epoxy resins in different trademarks have been employed as matrix materials of hybrid potting adhesives, thanks to their high Young's modulus, strong bonding force toward massive substrates, high solvent resistance and low production cost. Mixing different epoxy resins as matrices has been found to be highly helpful to achieving desirable high fluidity and high mechanical strength in composite potting adhesives, at the same time 3 . Furthermore, lots of acid-anhydride derived curing-agents such as methyl tetrahydrophthalic anhydride have been adopted in hybrid potting adhesives, attributed to rather wide temperature-applying range and favorable high electric insulation trait of cured epoxy based adhesives gained via those curing-agents 4 . By using those acid-anhydride derived curing-agents, potting adhesives have achieved several desired features such as easy perfusion process, low curing volume-shrinkage and high curing mechanical property. Besides, amine derived curing-agents have been found to result in property failure of cured adhesives at high temperature, but no performance failure was found at low temperature 5 .Although huge success has been obtained in acid-anhydride derived curing...

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“…Mylsamy and Rajendran reported that 5% alkali treatment removes completely the hemicellulose from the sisal fiber leaving behind 86.27% cellulose, 4.0 5% lignin, 0.14% wax. NaOH treatment of fibrils improved the tensile strength from 47.4 to 51.99 MPa at 35 wt% loading of sisal fibril in epoxy composite . Kumar et al reported that NaOH treatment led to 21.76% improvement in modulus for kenaf epoxy composites.…”

Section: Introductionmentioning

confidence: 99%

“…Different reinforcing elements can be obtained by various processing technique of natural fibers yielding different mechanical properties . Nimanpure et al experimented on sisal fibril epoxy composites and sisal fibril/kenaf fiber hybrid polyester composites, reported improved mechanical properties with increase in sisal fibril content.…”

Section: Introductionmentioning

confidence: 99%

Bio‐inspired low dielectric phenol formaldehyde laminates for electrical insulation applications

et al. 2019

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In this research work, the effect of individual and hybridized reinforcement of sisal fibrils with randomly distributed short sisal fibers has been investigated. The sisal fibrils (SP) and sisal fibers (SF) were reinforced with phenol formaldehyde matrix using hot stage compression molding technique. Composite laminates were prepared keeping the total wt% of the fibrils/fibers to be 40. The mechanical strength of SP reinforced phenol formaldehyde laminates was found to be superior as compared to sisal fiber and sisal fibril/fiber hybrid reinforced laminates. The 40 wt% sisal fibril reinforced composite laminates (SP40PF60) showed 73% and 25% increase in tensile strength, 78% and 23% increase in flexural strength, and 174% and 44% increase in impact strength as compared to 40 wt% sisal fiber reinforced laminates (SF40PF60) and 40 wt% hybrid reinforced (having equal proportion of fibrils and fibers) laminates (SF20SP20PF60). The dielectric properties of SP40PF60 increased by 14% and 9% as compared to SF40PF60 and SF20SP20PF60 laminates. Thermogravimetric analysis analysis also showed higher thermal stability for sisal fibril phenol formaldehyde laminates than pure fiber and fibril/fiber hybrid laminates. Scanning electron microscopy was carried out to understand the nature of fibril/ fiber/matrix interface. These laminates have been specially designed for press boards used in transformer assembly as environment friendly high mechanical strength and electrical insulating material. Additionally, these laminates can be useful for various fields such as electrical and aerospace industry. K E Y W O R D Selectrical properties, mechanical properties, natural hybrid composites, sisal fiber, sisal fibril, thermogravimetric analysis

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Sisal fibril epoxy composite—a high strength electrical insulating material

Cited by 8 publications

References 43 publications

Mechanical, electrical, and thermal analysis of sisal fibril/kenaf fiber hybrid polyester composites

Mechanical, electrical, and thermal analysis of sisal fibril/kenaf fiber hybrid polyester composites

High-performance ceramic/epoxy composite adhesives enabled by rational ceramic bandgaps

Bio‐inspired low dielectric phenol formaldehyde laminates for electrical insulation applications

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