The Experts below are selected from a list of 11295 Experts worldwide ranked by ideXlab platform
Mohammad Jawaid - One of the best experts on this subject based on the ideXlab platform.
-
effect of fibre orientations on the mechanical properties of Kenaf aramid hybrid composites for spall liner application
Defence Technology, 2016Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This paper presents the effect of Kenaf fibre orientation on the mechanical properties of Kenaf–aramid hybrid composites for military vehicle's spall liner application. It was observed that the tensile strength of woven Kenaf hybrid composite is almost 20.78% and 43.55% higher than that of UD and mat samples respectively. Charpy impact strength of woven Kenaf composites is 19.78% and 52.07% higher than that of UD and mat Kenaf hybrid composites respectively. Morphological examinations were carried out using scanning electron microscopy. The results of this study indicate that using Kenaf in the form of woven structure could produce a hybrid composite material with high tensile strength and impact resistance properties.
-
Effect of fibre orientations on the mechanical properties of Kenaf–aramid hybrid composites for spall-liner application
Defence Technology, 2016Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This paper presents the effect of Kenaf fibre orientation on the mechanical properties of Kenaf–aramid hybrid composites for military vehicle's spall liner application. It was observed that the tensile strength of woven Kenaf hybrid composite is almost 20.78% and 43.55% higher than that of UD and mat samples respectively. Charpy impact strength of woven Kenaf composites is 19.78% and 52.07% higher than that of UD and mat Kenaf hybrid composites respectively. Morphological examinations were carried out using scanning electron microscopy. The results of this study indicate that using Kenaf in the form of woven structure could produce a hybrid composite material with high tensile strength and impact resistance properties.
-
effect of layering sequence and chemical treatment on the mechanical properties of woven Kenaf aramid hybrid laminated composites
Materials & Design, 2015Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This work aims to evaluate the effect of layering sequence and chemical treatment on mechanical properties of woven Kenaf–Kevlar composites. Woven Kenaf–aramid hybrid laminated composites fabricated through hand lay-up techniques by arranging woven Kenaf and Kevlar fabrics in different layering sequences and by using treated Kenaf mat. To evaluate the effect of chemical treatment on hybrid composites, the woven Kenaf mat was treated with 6% sodium hydroxide (NaOH) diluted solution and compared mechanical properties with untreated Kenaf hybrid composites. Results shows that the tensile properties of hybrid composites improved in 3-layer composites compared to 4-layer composites. Hybrid composite with Kevlar as outer layers display a better mechanical properties as compared to other hybrid composites. Tensile and flexural properties of treated hybrid composites are better than non-treated hybrid composites. The fractured surface of hybrid composites was investigated by scanning electron microscopy. This study is a part of exploration of potential application of the hybrid composite in high velocity impact application.
-
development of Kenaf glass reinforced unsaturated polyester hybrid composite for structural applications
Composites Part B-engineering, 2014Co-Authors: A Atiqah, Mohammad Jawaid, Md Abdul Maleque, M IqbalAbstract:Abstract The main aim of this paper is to develop Kenaf-glass (KG) fibres reinforced unsaturated polyester hybrid composite on a source of green composite using sheet moulding compound process. Unsaturated polyester resin (UPE) and KG fibres in mat form were used at a ratio of 70:30 (by volume) with treated and untreated Kenaf fibre. The Kenaf fibre was treated with 6% sodium hydroxide (NaOH) diluted solution for 3 h using mercerization method. The hybrid composites were tested for flexural, tensile and Izod impact strength using ASTM D790-03, ASTM D618 and ASTM D256-04 standards respectively. The highest flexural, tensile and impact strength were obtained from treated Kenaf with 15/15 v/v KG fibres reinforced UPE hybrid composite in this investigation. Scanning electron microscopy fractography showed fibre cracking, debonding and fibre pulled-out as the main fracture mode of composites and Kenaf treated 15/15 v/v KG reinforced hybrid composite exhibited better interfacial bonding between the matrix and reinforcement compared to other combinations.
Edi Syam Zainudin - One of the best experts on this subject based on the ideXlab platform.
-
effect of fibre orientations on the mechanical properties of Kenaf aramid hybrid composites for spall liner application
Defence Technology, 2016Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This paper presents the effect of Kenaf fibre orientation on the mechanical properties of Kenaf–aramid hybrid composites for military vehicle's spall liner application. It was observed that the tensile strength of woven Kenaf hybrid composite is almost 20.78% and 43.55% higher than that of UD and mat samples respectively. Charpy impact strength of woven Kenaf composites is 19.78% and 52.07% higher than that of UD and mat Kenaf hybrid composites respectively. Morphological examinations were carried out using scanning electron microscopy. The results of this study indicate that using Kenaf in the form of woven structure could produce a hybrid composite material with high tensile strength and impact resistance properties.
-
Effect of fibre orientations on the mechanical properties of Kenaf–aramid hybrid composites for spall-liner application
Defence Technology, 2016Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This paper presents the effect of Kenaf fibre orientation on the mechanical properties of Kenaf–aramid hybrid composites for military vehicle's spall liner application. It was observed that the tensile strength of woven Kenaf hybrid composite is almost 20.78% and 43.55% higher than that of UD and mat samples respectively. Charpy impact strength of woven Kenaf composites is 19.78% and 52.07% higher than that of UD and mat Kenaf hybrid composites respectively. Morphological examinations were carried out using scanning electron microscopy. The results of this study indicate that using Kenaf in the form of woven structure could produce a hybrid composite material with high tensile strength and impact resistance properties.
-
effect of layering sequence and chemical treatment on the mechanical properties of woven Kenaf aramid hybrid laminated composites
Materials & Design, 2015Co-Authors: Rusliza Yahaya, Mohammad Jawaid, Zulkiflle Leman, Salit Mohd Sapuan, Edi Syam ZainudinAbstract:This work aims to evaluate the effect of layering sequence and chemical treatment on mechanical properties of woven Kenaf–Kevlar composites. Woven Kenaf–aramid hybrid laminated composites fabricated through hand lay-up techniques by arranging woven Kenaf and Kevlar fabrics in different layering sequences and by using treated Kenaf mat. To evaluate the effect of chemical treatment on hybrid composites, the woven Kenaf mat was treated with 6% sodium hydroxide (NaOH) diluted solution and compared mechanical properties with untreated Kenaf hybrid composites. Results shows that the tensile properties of hybrid composites improved in 3-layer composites compared to 4-layer composites. Hybrid composite with Kevlar as outer layers display a better mechanical properties as compared to other hybrid composites. Tensile and flexural properties of treated hybrid composites are better than non-treated hybrid composites. The fractured surface of hybrid composites was investigated by scanning electron microscopy. This study is a part of exploration of potential application of the hybrid composite in high velocity impact application.
Hiroshi Inagaki - One of the best experts on this subject based on the ideXlab platform.
-
Kenaf reinforced biodegradable composite
Composites Science and Technology, 2003Co-Authors: Takashi Nishino, Koichi Hirao, Masaru Kotera, Katsuhiko Nakamae, Hiroshi InagakiAbstract:Abstract Mechanical properties of environmentally friendly composite made of Kenaf fibre and poly- l -lactic acid (PLLA) resin was investigated. Young's modulus (6.3 GPa) and the tensile strength (62 MPa) of the Kenaf/PLLA composite (fibre content=70 vol.%) were comparable to those of traditional composites. These properties were higher than those of the Kenaf sheet and the PLLA film themselves. This is considered to attribute to the strong interaction between the Kenaf fibre and PLLA. In addition, the storage modulus of the composite remain unchanged up to the melting point of PLLA. The effects of the molecular weight of PLLA, the orientation of the Kenaf fibres in the sheet on the mechanical properties of the composite were also investigated. It was found that Kenaf fibre can be a good candidate for the reinforcement fibre of high performance biodegradable polymer composites.
-
Kenaf reinforced biodegradable composite
Composites Science and Technology, 2003Co-Authors: Takashi Nishino, Koichi Hirao, Masaru Kotera, Katsuhiko Nakamae, Hiroshi InagakiAbstract:Mechanical properties of environmentally friendly composite made of Kenaf fibre and poly-l-lactic acid (PLLA) resin was investigated. Young's modulus (6.3 GPa) and the tensile strength (62 MPa) of the Kenaf/PLLA composite (fibre content = 70 vol.%) were comparable to those of traditional composites. These properties were higher than those of the Kenaf sheet and the PLLA film themselves. This is considered to attribute to the strong interaction between the Kenaf fibre and PLLA. In addition, the storage modulus of the composite remain unchanged up to the melting point of PLLA. The effects of the molecular weight of PLLA, the orientation of the Kenaf fibres in the sheet on the mechanical properties of the composite were also investigated. It was found that Kenaf fibre can be a good candidate for the reinforcement fibre of high performance biodegradable polymer composites. © 2003 Elsevier Science Ltd. All rights reserved.
Ignaas Verpoest - One of the best experts on this subject based on the ideXlab platform.
-
natural fibres can they replace glass in fibre reinforced plastics
Composites Science and Technology, 2003Co-Authors: Paul Wambua, Jan Ivens, Ignaas VerpoestAbstract:In this work, natural fibres (sisal, Kenaf, hemp, jute and coir) reinforced polypropylene composites were processed by compression moulding using a film stacking method. The mechanical properties of the different natural fibre composites were tested and compared. A further comparison was made with the corresponding properties of glass mat reinforced polypropylene composites from the open literature. Kenaf, hemp and sisal composites showed comparable tensile strength and modulus results but in impact properties hemp appears to out-perform Kenaf. The tensile modulus, impact strength and the ultimate tensile stress of Kenaf reinforced polypropylene composites were found to increase with increasing fibre weight fraction. Coir fibre composites displayed the lowest mechanical properties, but their impact strength was higher than that of jute and Kenaf composites. In most cases the specific properties of the natural fibre composites were found to compare favourably with those of glass.
-
Natural fibres: Can they replace glass in fibre reinforced plastics?
Composites Science and Technology, 2003Co-Authors: Paul Wambua, Jan Ivens, Ignaas VerpoestAbstract:In this work, natural fibres (sisal, Kenaf, hemp, jute and coir) reinforced polypropylene composites were processed by compression moulding using a film stacking method. The mechanical properties of the different natural fibre composites were tested and compared. A further comparison was made with the corresponding properties of glass mat reinforced polypropylene composites from the open literature. Kenaf, hemp and sisal composites showed comparable tensile strength and modulus results but in impact properties hemp appears to out-perform Kenaf. The tensile modulus, impact strength and the ultimate tensile stress of Kenaf reinforced polypropylene composites were found to increase with increasing fibre weight fraction. Coir fibre composites displayed the lowest mechanical properties, but their impact strength was higher than that of jute and Kenaf composites. In most cases the specific properties of the natural fibre composites were found to compare favourably with those of glass. © 2003 Elsevier Science Ltd. All rights reserved.
Kar Lin Nyam - One of the best experts on this subject based on the ideXlab platform.
-
Effect of steam blanching and high temperature drying on the physicochemical properties, antioxidant activities and consumer acceptability of Hibiscus cannabinus leaves tea
Journal of Food Science and Technology, 2020Co-Authors: Kar Lin NyamAbstract:Kenaf ( Hibiscus cannabinus ) leaves are produced as the by product when Kenaf stems were harvested. The Kenaf leaves was examed for the applicable possibility as herbal tea due to their rich phenolic content. In this study, the effect of steam blanching and high temperature drying on physicochemical properties, antioxidant activity and consumer acceptability of the Kenaf tea leaves were studied. Results showed that steam blanching prior oven-drying improved the extractability of phenolic compounds, leading to the increase in total flavonoid content, 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity, and ferric reducing antioxidant power. Drying at 120 °C was able to preserve more phenolic compounds, at the same time developing better taste, mouthfeel, and overall acceptability of Kenaf leaves tea. Caffeic acid, tannic acid, catechin, and chlorogenic acid in Kenaf tea leaves infusion were analyzed by ultra high performances liquid chromatography. In conclusion, steam blanching prior to 120 °C oven-drying was the best process method for the production of Kenaf leaves into acceptable tea type.
-
Kenaf (Hibiscus cannabinus L.) Seed Oil
Fruit Oils: Chemistry and Functionality, 2019Co-Authors: Sook-chin Chew, Kar Lin NyamAbstract:Kenaf (Hibiscus cannabinus L.) has received attention worldwide for its commercial value as fiber applications. Kenaf seeds, a by-product from Kenaf plant yield Kenaf seed oil with no toxicity and primarily contributed by triacylglycerols (99.81%) followed by free fatty acids, diacylglycerols, and monoacylglycerols. Extensive research has related to the processing and applications of Kenaf seed oil, which highlighted its potential to use as functional edible oil that advantageous in the food, nutraceutical, and pharmaceutical industry. A chemical refining process with different parameters in each stage has been studied to produce refined Kenaf seed oil with removed gums, hydroperoxides, and free fatty acid, as well as no 3-monochloro-1,2-propanediol ester detected. Oleic acid (omega-9) and linoleic acid (omega-6) make up the majority of Kenaf seed oil’s fatty acid composition, which is associated with cholesterol-lowering ability. Kenaf seed oil possesses significant health benefits and pharmacological activities such as antioxidant activity, anti-hypercholesterolemic, anti-cancer, anti-inflammatory, anti-ulcer, and anti-thrombotic due to the presence of bioactive compounds (tocopherols, tocotrienols, phytosterols, and phenolics). Nanoencapsulation and microencapsulation have been applied to the Kenaf seed oil to improve its bioaccessibility and bioavailability in the gastrointestinal tract. Oxidative stability of Kenaf seed oil has been extended through microencapsulation techniques (spray drying and co-extrusion) and suitable to apply in the functional product development. The chemistry and functionality of Kenaf seed oil are reviewed in this chapter to stimulate future research and impending applications.
-
Changes in 3-MCPD esters, glycidyl esters, bioactive compounds and oxidation indexes during Kenaf seed oil refining
Food Science and Biotechnology, 2017Co-Authors: Sook-chin Chew, Chin-ping Tan, Oi Ming Lai, Kar Lin NyamAbstract:An optimized refining process for Kenaf seed oil was conducted. The 3-monochloro-1,2-propanediol (3-MCPD) contents, triacylglycerol composition, fatty acids composition, bioactive compounds, phosphorus contents, and oxidation indexes of the Kenaf seed oil during each stage of the refining process were determined. The results showed that there was no detected 3-MCPD ester in Kenaf seed oil throughout the refining process. Deodorization had slightly increased the 2-MCPD ester (9.0 μg/kg) and glycidyl ester (54.8 μg/kg). Oleic (36.53%) and linoleic acids (36.52%) were presented in the largest amount in the refined Kenaf seed oil, and triacylglycerols contributed to 99.96% in the oil. There was a removal of 31.6% of phytosterol content and 17.1% of tocopherol and tocotrienol contents in Kenaf seed oil after refining. The refining process was totally removed the hydroperoxides, 93% of free fatty acids and 98.8% of phosphorus content in Kenaf seed oil.
