Roselle Fiber Research Articles

Effect of snail shell powder addition on mechanical and microstructure behaviour of mercerized roselle fiber reinforced epoxy resin-based hybrid composite

Hybrid composites are materials composed of a combination of two or more different types of reinforcements, often with distinct properties. The combination of different reinforcements aims to exploit the strengths of each material, resulting in a composite with improved mechanical, thermal, or other specific properties compared to individual components. Nowadays, application of hybrid composites reinforced with natural fibers has gained significance in various industries due to the unique combination of properties such as automobile, aerospace, construction, Sports and Leisure. Eventhough, natural fibers may degrade over time due to environmental factors, resulted in decrease in mechanical properties and overall durability of the hybrid composite. Therefore, Hybrid composites can achieve a combination of high strength, stiffness and toughness that is difficult to obtain with single-fiber composites. The aim of the study is to develop roselle fibers reinforced epoxy resin-based hybrid composite using hand layup method. The snail shell powder with different weight proportion (5, 10 & 15 wt.-%) and 20% (wt.-%) of roselle fiber have been added to fabricate the hybrid composite. The study was carried out in order to study the mechanical properties such as tensile, flexural, impact and hardness strength. The results showed that the composites fabricated with 10% of snail shells powder showed the maximum tensile strength of 40 MPa, flexural strength of 57 MPa and impact strength of 31 KJ/m2. The 15% filler added composite showed the maximum hardness strength of 43 HV. It was observed that the fracture mechanism of a hybrid composite involves fiber breakage, matrix cracking, delamination, matrix debonding, crack initiation and voids etc were formed in the composite. The Composite samples embedded with fillers demonstrate the lowest water intake behaviour. The findings showed that the hybrid composite with 10% snail shell powder exhibited the highest tensile, flexural and impact strength while the 15% snail shell powder composite showed the highest hardness (43 HV). Additionally, snail shell embedded composites demonstrated the lowest water intake behaviour. Fracture analysis revealed mechanisms such as fiber breakage and matrix cracking observed via SEM.

Physicochemical Properties and Sensory Evaluation of Yogurt Formulated with Pineapple and Roselle Fibres

Functional food promotes specific health benefits and lowers the risk of acquiring health problems. Probiotics, prebiotics, and omega-3 fatty acids were added to functional food to enhance the nutritional value of the food itself. Yogurt is one of the examples of widely produced probiotic products. Concerns arise due to reduced fibre in refined food, leading to an increased risk of colon cancer and gastrointestinal diseases. Fruit-based yogurts with artificial additives were developed to cater to consumer preferences but were found to give negative health effects. To address this, yogurt with natural fibre sources like roselle and pineapple fibres was formulated, providing health-promoting components, flavor, and color without resorting to artificial additives. Current work focused on physicochemical properties and sensory evaluation of yogurt formulated with roselle and pineapple fibres. The concentration of roselle and pineapple fibres added were varied and their effect on the physicochemical properties of yogurt namely pH, viscosity, antioxidant activity, and syneresis were investigated. The evaluation was conducted at four different storage periods, which were on the 7th, 14th, 21st, and 28th days of yogurt storage. A sensory evaluation was also tested. The pH of formulated yogurt decreased as the concentration of roselle, and pineapple fibre increased. The highest viscosity was recorded for yogurt formulated with 8% pineapple fibre. Yogurt enriched with 8% roselle fibre demonstrated a superior antioxidant content. For sensory evaluation, yogurt with 4% pineapple fibre received the highest score regarding overall acceptability. The incorporation of roselle and pineapple fibre into yogurts formulation can be an alternative method in adding dietary fibres to the dairy products.

Experimental studies on water absorption and mechanical properties of Hibiscus sabdariffa (Roselle) and Urena lobata (Caesar weed) plant Fiber–Reinforced hybrid epoxy composites: effect of weight fraction of nano-graphene fillers

Abstract This study aimed to develop novel hybrid composites with graphene (Gr) fillers incorporated in the epoxy (E) matrix with Caesar weed fiber (CF), and roselle fiber (RF) as reinforcements. Compression molding methods were used to fabricate hybrid composite materials with a variable-weight graphene filler in a constant fiber epoxy matrix. On the basis of the results, the mechanical characteristics of the composite with 6 wt% Gr exhibited the greatest flexural strength, tensile strength, and impact strength. This occurred because 6 wt% Gr particles are more uniformly dispersed in an epoxy matrix, resulting in better compatibility between reinforcementand matrix, thus increasing the mechanical properties. The composite with 8 wt% Gr filler reinforcement had the maximum hardness rating and the lowest percentage of water absorption. According to the results, adding graphene fillers to the CF/RF/E composite significantly improved the mechanical and water absorption performances. Scanning electron microscopy was used to examine the surfaces of the fabricated samples. The weight fraction of the graphene filler was optimized to enhance the mechanical properties of the composite for use in various engineering applications, such as automobile, defense, marine, sports, and musical instruments.

Synthesis and characterization study of Roselle fiber bonded polypropylene composite enriched by silica nanoparticles derived from bryophyllum pinnatum leaf waste

Synthesis and characterization study of Roselle fiber bonded polypropylene composite enriched by silica nanoparticles derived from bryophyllum pinnatum leaf waste

Effect of hybridization and stacking sequences on mechanical properties and thermal stability of aloe vera‐roselle‐glass fiber reinforced polymer composites

AbstractEnvironment friendly polymer composites made of plant based natural fibers such as bamboo fiber, roselle fiber (RF), aloe vera fiber (AF) oil, or kenaf fiber are cardinal of the current world toward sustainability. They offer lower carbon footprint, higher biodegradability, higher specific strength, higher thermal, and acoustic characteristics. On the other hand, properties of synthetic glass fibers (GFs) such as high specific strength to weight ratio, great resistance during impact, and high durability extend their application perspective for various engineering materials. As such, in the present study, mechanical properties and thermal stability of hybrid laminate comprising of natural fiber (i.e., AF and RF) and synthetic fiber (i.e., GF) fabricated using hand layup process were investigated. Experimental findings reveal that sequencing of the fibers significantly affects properties of the composite. Introducing a layer of AF between RF increased the tensile strength by 30.2% respectively while hybrid laminates composed of three successive layers of RF exhibited 12.6% higher impact strength compared to hybrid laminate composed of AF. Besides, the thermal stability of hybrid laminates was higher (i.e., minimal weight loss of <6.1% when heated up to 800°) compared to neat polymer or laminates with single reinforcement. The enhanced thermal stability, mechanical properties, and tribological properties of the “greener” hybrid laminates can be employed in various structural or lightweight industrial applications.Highlights Hybridization using natural fibers and synthetic fibers are attempted and investigated. Fiber sequencing significantly affects mechanical properties of the composite. Higher thermal stability of hybrid laminates, that is, minimal weight loss of <6.1% when heated up to 800°. Laminated composed of AF in between RF exhibited lowest frictional coefficient. “Green” hybrid polymer laminate suitable for various structural and lightweight industrial applications is identified.

Evaluation of the physical, mechanical, water absorption, and tribological behavior of pineapple leaf fiber/roselle fiber reinforced vinyl ester hybrid composites for non‐structural applications

AbstractNatural fiber‐based polymer composites have greater advantages due to their superior mechanical properties and environmentally friendly nature. In the present study, pineapple leaf (PALF) and roselle fiber (RSF) reinforced vinyl ester hybrid composites were fabricated by the hot compression molding method, and their physical properties, mechanical properties, water absorption rate, and tribological behavior were investigated and analyzed. This research investigation has been conducted to reveal a significant hybrid of natural fiber reinforced polymer composites for commercial engineering applications. Mechanical properties were examined for their tensile, flexural, compression, hardness, and impact properties. Moreover, the fractured surfaces of the tensile specimen were analyzed using a scanning electron microscope. Water absorption behaviors were then accomplished by immersing the composite samples in standard distilled water and analyzing the water penetration percentage. The tribological behavior was simply studied by using a pin‐on‐disc tribometer apparatus to evaluate the specific wear rate and coefficient of friction. From the results, it was concluded that the hybrid composites provided higher results in all kinds of formats when compared with single‐fiber composites. Among the hybrid composites, the 24PALF/16RSF/60VE sample was particularly promising for its improvement in mechanical properties of 103.9% tensile strength, 109.7% flexural, 26.2% compression, 56.9% impact, and 113.5% hardness compared to the neat resin sample. Thus, the results illustrate that the hybridization of PALF and RSF fibers with a vinyl ester matrix generates enhanced mechanical behaviors, which indeed make it desirable for use in non‐structural electrical and electronics insulation board and component applications.

Investigating the Influence of Water Absorption and Mechanical Properties of Composites Reinforced with Banana and Roselle Fibers

Abstract: Fiber-reinforced polymer composites are the best at many things because they have high specific strength and modulus. Plastics are reinforced with artificial or natural fibers. Glass, carbon, and other synthetic fibers have long been used in fiber-reinforced plastics. Despite having high specific strengths, glass and other synthetic fiber-reinforced plastics are rarely used due to the high cost of production. For this, researchers have studied roselle, a plentiful natural fiber from India. Natural fibers are lightweight, strong, and reasonably priced. This study develops and characterizes a new class of natural fiber-based polymer composites using roselle fiber and banana fiber reinforcement. The new composites' mechanical characteristics are described. Research is being done to better understand the mechanical behaviour of epoxy-based polymer composites. Composites made of banana fiber and roselle fiber are gaining attention as sustainable and cost-effective alternatives to synthetic fiber composites. In this study, six different compositions of these natural fiber composites were prepared, and six specimens were tested using tensile tests and water absorption tests, in accordance with ASTM standards. The results showed an increase in tensile strength with a 68% improvement observed when compared to pure epoxy resin. The water absorption tests were conducted by varying the weights of the composites and increasing the weights gradually over a period of 10 days. The findings showed that the composites exhibited excellent resistance to water absorption, with the weight gain being significantly lower than that of pure epoxy resin. These results suggest that composites made of banana fiber and roselle fiber can be a promising alternative to traditional synthetic fiber composites, with improved mechanical properties and resistance to water absorption.

The effect of natural Gongura roselle fiber on the mechanical properties of 3D printed ABS and PLA composites

The influence of the natural Gongura roselle fiber on the tensile and flexural properties as well as on Shore D hardness of acrylonitrile-butadiene-styrene (ABS) and poly (lactic acid) (PLA) was investigated. The composites were printed in fused deposition modeling (FDM) 3D technique. The addition of natural fiber improved the mechanical properties of the tested composites, while the flexural strength, modulus and hardness were better in the case of ABS-based composite. Whereas, PLA-based composites showed higher tensile strength. The influence of the nozzle angle on the mechanical properties of the composites was also investigated. The best results have been obtained when using an angle of 0 °.

Water Absorption and Thickness Swelling Behaviour of Woven Roselle Fibre Epoxy Composites

The effect of roselle fabric weave pattern on water absorption and thickness swelling behaviour of woven roselle fibre composites has been investigated. Roselle fabrics with various weaving design such as plain, twill, satin and basket are used in this study. All composites are produced using hand layup process. The water absorption and thickness swelling behaviour of all composites are studied as per ASTM standards. The test samples were immersed in distilled water at room temperature and change in weight and thickness of the test samples recorded at every 24 hour time interval. For all composite samples, saturation in water absorption and thickness swelling was observed after 264 hours of water immersion. Result revealed that the plain-woven composite yields higher resistance to water absorption and thickness swelling than other types of composites.

Mechanical Characterization of Stacked Roselle Fibre Composites: Effect of Fibre Orientation

The effect of fibre orientation on the tensile and dynamic mechanical performance of stacked Roselle fibre epoxy composites has been investigated. The hand layup method is employed to produce 0/90, 0/45 and ± 45 oriented Roselle fibre epoxy composites. The tensile test and dynamic mechanical analysis (DMA) were conducted as per ASTM standards. Results revealed that the tensile strength of 0/45 oriented Roselle fibre composite is 341% more than neat epoxy, 44% higher than 0/90 oriented composite and 106% greater than ± 45 oriented composite. As compared to pure resin, composites possess enhanced storage modulus. The composite with 0/45 orientation has higher storage modulus value than other composites. All Roselle fibre composites have up to 15% reduced glass transition temperature as compared to neat epoxy. SEM images cover the fibre pull-out and the presence of micro-voids in the epoxy matrix.

Effect of Water Absorption Behaviour on Tensile Properties of Hybrid Jute-Roselle Woven Fibre Reinforced Polyester Composites

Incorporating natural fibre as reinforcement in the polymer matrix has shown a negative effect since the natural fibre is hydrophilic. The natural fibre easily absorbs water which causes an effect on the mechanical properties of the composites. The objective of this paper is to investigate the water absorption behaviour of hybrid jute-roselle woven fibre reinforced unsaturated polyester composite and the effect of water absorption in terms of tensile strength and tensile modulus. The effect of hybrid composite on the thickness swelling will be tested. The fabrication method used in this study is the hand lay-up technique to fabricate 2-layer and 3-layer composites with layering sequences of woven jute (J)/roselle (Ro) fibre. The results of the study showed that pure roselle fibres for 2 and 3-layer composites have the highest water absorption behaviour 3.86% and 5.51%, respectively, in 28 days) as well as thickness swelling effect, whereas hybrid J-Ro and J-J-Ro composites showed the least water absorption (2.65% and 3.76%, respectively) in 28 days) in both the tests. The hybridisation between jute and roselle fibres reduced water absorption behaviour and improved the fibres dimensional stability. The entire composites showed a decreasing trend for both tensile strength and tensile modulus strength after five weeks of water immersion. Jute fibre composite hybridised with roselle fibre can be used to reduce the total reduction of both tensile strength and tensile modulus throughout the whole immersion period. Moreover, the tensile testing showed that jute fibre composite hybridised with roselle fibre have produced the strongest composite with the highest tensile and modulus strength compared to other types of composites. The hybridisation of diverse fibre reinforcements aids in minimising the composite water absorption and thickness swelling, hence reducing the effect of tensile characteristics.

Viscoelastic behavior of natural fiber reinforced composite material

The hybrid natural fiber (aloe vera, roselle fibers enclosed with glass fiber) reinforced epoxy laminate is prepared by hand layup technique. LY556 epoxy resin and HY951 hardener were used in the preparation by 10:1 ratio. The prepared laminate is sampled by water jet machining for Dynamic Mechanical Analysis and Flame test as per ASTM standards. The viscoelastic behavior was studied from the curve, and it shows the concluded storage modulus is attained for the temperature of 88 °C, and the loss modulus shows a maximum of 416 MPa at 90 °C. The tan delta value is a maximum of 0.6 at 90 °C. The flame test result for the natural fiber reinforced hybrid composite shows the burning of composite per minute is 9.13 mm. The result shows the effect of hybridization shows a vital role in viscoelastic behavior.

Effect of fibre content on physical properties of short roselle fibre epoxy composites

This study focus on the physical characterization of short roselle fibre polymer composites. Short roselle fibre composites with 10%, 20%, 30% and 40% fibre content by weight were produced using the hand lay-up technique. Composite’s physical properties like density, void content and water uptake capacity were obtained as per ASTM standards. The void content of the composites ranges from 1.28 to 6.71%, which is quite low for short and randomly oriented composites. The saturation in water uptake was observed after 7 to 8 days of water immersion. The water uptake capacity of the roselle fibre composites increases with an increase in fibre content. It indicates the composites with the lower fibre content yield a higher resistance to water absorption.

Study of Mechanical Properties of Roselle Fiber Reinforced Vinyl Ester Biocomposite Based on the length and content of Fiber

Mechanical properties of Roselle fiber reinforced vinyl ester biocomposite were studied based on the fiber content and length in the present communication. Usually, natural fiber reinforced polymer composites depend on some aspects such as fiber content, fiber length and orientation, the fiber-matrix adhesion. Composite plates were prepared by a simple hand lay-up technique for two different fiber lengths (3 and 13 mm) and five different fiber content (10, 20, 30, 40 and 50 wt%). Composite specimens were tested according to ASTM standards and their results were recorded. Experimental results showed that mechanical properties such as tensile, flexural and impact, increases with increase of fiber content up to 40 wt% after which it is decreases at both the fiber length. However, modulus values were increased linearly with fiber content of 10 to 50 wt%. Composites with the fiber length of 13 mm show the high level of mechanical properties compared to composites with the fiber length of 3 mm at all combinations of fiber contents. It is observed that the optimal fiber content is 40 wt%, which can be used to obtain the maximum property level in the Roselle fiber reinforced vinyl ester composites

Fresh and mechanical characteristics of roselle fibre reinforced self-compacting concrete incorporating fly ash and metakaolin

This study covered the fresh and mechanical characteristics of self-compacting concrete incorporating various fractions of (natural) roselle fibre (1 to 4% with 1% increment by weight of powder content). The fresh state behaviour of the composite was assessed by measuring the slump flow diameter, V-funnel flow time, L-box blocking ratio and J-ring step height. Meanwhile, the mechanical characteristics of the composite were determined by measuring the compressive strength, splitting tensile strength, modulus of rupture, modulus of elasticity and impact strength. Data collected from the experiments of the fresh and mechanical characteristics of the roselle fibre reinforced self-compacting concrete mix were correlated and subjected to regression analysis. The findings indicated that the incorporation of the roselle fibre reduced the workability behaviour of the self-compacting concrete. By contrast, the mechanical characteristics, such as compressive strength, splitting tensile strength, modulus of rupture and modulus of elasticity were enhanced with increasing fibre content. However, 4% fibre addition resulted in a marginally decreased compressive strength and modulus of elasticity of the self-compacting concrete. Empirical equations were developed to correlate the splitting tensile strength, flexural strength and modulus of elasticity to the compressive strength with high values of coefficient of determination. Experimental findings were found to be in good agreement with existing correlations reported in standards and literature.

Characterization of Roselle fiber composites for low load bearing structures

AbstractThe influence of weaving architecture on mechanical and dynamic mechanical properties of woven roselle fiber epoxy composite has been investigated. Plain, twill, satin, and basket type weaving patterns are considered for this study. Hand lay‐up process is used to produce the woven composites. Mechanical tests (tensile, flexural, and impact test) and dynamic mechanical analysis are conducted according to ASTM standards for material characterization. Results revealed that basket type architecture of woven roselle fiber epoxy composite has better tensile, flexural, and impact strengths. Woven composites have improved storage modulus in comparison with neat epoxy. Woven composites have 3% to 15% lower glass transition temperature than that of neat epoxy. Scanning electron microscopy (SEM) analysis is carried out to correlate the experimental findings. SEM images showed evidence of fiber pullout and cracks near fiber bundle, which indicates non‐uniform transfer of stress from fiber to the matrix.

Study on The Mechanical Properties of Roselle Fiber and Palm Seed Powder Reinforced Epoxy Hybrid Composite

Recently, due to increasing environmental concerns, scientists and researchers have been replacing synthetic fibers with natural fibers as the main component in composites. Roselle is one suitable natural fiber. The plant’s history, physical description, cultural methods, and usages were explained to further understand this potential plant. It is clear that extensive research has been performed on the fiber extraction methods, properties, and possible surface treatments of Roselle fibers to enhance its properties in the manufacturing of natural-fiber-reinforced polymer composites.Also Epoxy hybrid Palm Seed powder with Roselle fiber to strengthen the materials; however, no review has covered the properties and applications of Roselle fibers and palm seed powders in detail. Thus we have investigated Tensile, Impact, Flexural and Water absorption test of Roselle fiber and Palm Seed powder composite. Therefore, a study was performed on Roselle fiber to determine its potential to enable a better selection of materials to produce composites for potential applications in the construction and building, automotive, and aerospace industries.

Flexural and Abrasion Behaviour of Flooring Tile with Roselle Fiber

In the world-wide research is being conducted concerning the use of fibers. This research aims to analyze the strength and behavior of natural fiber tiles relative to the conventional tiles. The researchers are exploring new materials that expand choices of flooring tiles. In this researcher produces tiles using Roselle fibers. India is the country having largest producer of roselle fiber. In this study Roselle fiber is used in two techniques, one in the form of mesh and another is mixing it with mortar. For both techniques the percentage of natural fiber was different. Because of increasing environmental problems, scientists and researchers are using natural fiber instead of synthetic fiber as the main component in composites. Cement mortar has very low tensile strength, limited ductility and little resistance to cracking. This study aims to compare flexural strength and abrasion of tiles by using natural fiber tile and conventional tile.

Mechanical and tribological properties of abaca-roselle/cardanol formaldehyde hybrid composites

The demand for development of new materials to meet the challenges for ingenious applications in the scientific and technical areas is quite essential in recent days. Many of the composites of hydrophilic natural fibers with hydrophobic synthetic polymers suffer from the lack of strong interfacial adhesion between them. To overcome this difficulty, the present study aimed to blend a natural fiber with biopolymer to fabricate bio-hybrid composite. For this purpose, cardanol formaldehyde resin (CFR) as a matrix, biodegradable and biocompatible was chosen. Functionalized abaca and roselle fibers are used as reinforcement fillers to enhance the thermal and mechanical characteristics of the films fabricated by compression moulding method. Hybridization of abaca fiber with roselle fiber has improved the hardness, tensile and density of the matrix. The tribological property of biodegradable hybrid composites is studied using a pin-on-disc tool to carryout sliding wear behaviour. Surface morphology is examined by SEM to understand the surface morphology of the composites. The CFR/10% (abaca-roselle) bio-hybrid composite was improved wear resistance used in the development of homemade applications.

Experimental Research on Roselle / Glass Fibre Hybrid Polymer Composites

Varieties in tractable and sway properties of Roselle fiber strengthened polyester composites brought about by the expansion of glass fiber have been investigated. Roselle fiber in mix with glass is magnificent for making economically savvy composite materials. The impact of the plan of glass and Roselle fiber in the readiness of composites have likewise been examined. Direct increment in rigidity is noted because of the expansion of glass. Be that as it may, when lower volume portion of glass is utilized, a cozy blend of Roselle fiber and glass demonstrates the most elevated rigidity. The effect quality demonstrates the most noteworthy worth when a glass volume part of 0.12 is utilized.