Papers by Keyword: Biocomposite

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Authors: Ehsan Sharifi Sede, Shamsedin Mirdamadi, Hossein Arabi
Abstract: This study sought to create a biocomposite of Magnesium and Titanium via a powder metallurgy technique. Powder metallurgy technique was used to produce three different volume percentages of Magnesium (30% , 35% , 40%). Titanium powder was mixed with Magnesium, then the samples were compressed by 1800 Bar using a cold, isostatic press process. The samples were then sintered to 850 for 100 min. At this temperature, the compressive yield strength was increased to 210 Mpa and significantly depended on the volume percent of Magnesium present, the core size and temperature of sintering. The bioactivity of the samples in a simulated body fluid (SBF) was also investigated. When the samples were immersed in the simulated body fluid for a 14 and 28 days, calcium and other elements were found to be deposited on the surface. Additionally, it was found that TiO2 has the ability to induce the formation of bone-like apatite in the SBF. In addition, the degradation product of Magnesium in a biological system caused a rise in the pH and environment for the deposition of calcium and other element on the surface were enhanced. Finally, the samples were analyzed using XRD, EDS, and optical and scanning electron microscopy (SEM).
Authors: Mujtahid Kaavessina, Fitriani Khanifatun, Imtiaz Ali, Saeed M. Alzahrani
Abstract: Poly (lactic acid) was solvent-blended and formed as thin ribbons with different weight fraction of hydroxyapatite, namely 5, 10 and 20wt%. In-vitro biodegradability of biocomposites was performed in phosphate buffer solution (PBS) at 37°C. The presence of hydroxyapatite tended to increase biodegradability of poly (lactic acid) in its biocomposites. Thermal stability of biocomposites was always higher than that neat poly (lactic acid) either before and after hydrolytic degradation tests. After biodegradation tests, some micro-holes and cracks were appeared in the surface morphology of biocomposites as well as the increasing crystallinity occurred.
Authors: Jerrold E. Winandy
Abstract: Use of wood-based-composites technology to create value-added commodities and traditional construction materials is generally accepted worldwide. Engineered wood- and lignocellulosiccomposite technologies allow users to add considerable value to a diverse number of wood- and lignocellulosic feedstocks including small-diameter timber, fast plantation-grown timber, agricultural fibre and lignocellulosic residues, exotic-invasive species, recycled lumber, and timber removals of hazardous forest-fuels. Another potential advantage of this type of economic- and materials-development scenario is that developing industrial composite processing technologies will provide producers an ability to use, and to adapt with, an ever-changing quality level of wood and/or other natural lignocellulosic feedstocks. However, the current level of performance of our state-of-the-art engineered composite products sometimes limit broader application into commercial, non-residential and industrial construction markets because of both real and perceived issues related to fire, structural-performance, and service-life. The worldwide research community has recognized this and is currently addressing each of these issues. From a performance standpoint, this developing knowledge has already and will continue to provide the fundamental understanding required to manufacture advanced engineered composites. From a manufacturing and a resource sustainability standpoint, with this evolving fundamental understanding of the relationships between materials, processes, and composite performance properties we now can in some cases, or may soon be able to, recognize the attributes and quality of an array of bio-based materials then adjust the composite manufacturing process to produce high-performance composite products. As this fundamental understanding is developed, we will increasingly be able to produce advanced, high-performance wood- and bio-composites. Then we must use those technologies as tools to help forest and land managers fund efforts to restore damaged eco-systems and which in turn may further promote sustainable forest management practices.
Authors: Faizah Muhamad Fauzi, Suhaimi Muhammed
Abstract: Shortage of solid wood supply as the main raw material for the wood-based industries is cute problem faced by the world wide wood industry. Agricultural residues especially from oil palm plantation are abundantly and is therefore hoped to solve the above problem. In this context, this study would like to venture into the utilization of oil palm frond (OPF) as the potential agricultural residues for the manufacture of biocomposite panel. Raw material (OPF) mixed with the binder urea formaldehyde at three resin levels (8%, 10%, and 12%) to produce board of two density levels (550 kg/m3 and 650 kg/m3). The boards produced were tested for the mechanical strength (MOE & MOR) in accordance with the European Standard (EN 310). The results showed that the MOE values increased as the resin content increased for both board densities. The values are 1755.54 MPa to 2147.44 MPa for 550 kg/m3 and 2351.81 MPa to 2810.34 MPa for 650 kg/m3. Respectively, similar trend of increment was exhibited for the MOR values 12.18 MPa to 14.98 MPa for 550 kg/m3 and 16.62 MPa to 19.90 MPa for 650 kg/m3. In conclusion, the utilization of oil palm frond for the production of strong biocomposite material stands a great potential.
Authors: Andrzej K. Bledzki, Magdalena Urbaniak, Axel Boettcher, Christian Berger, Ryszard Pilawka
Abstract: This paper focuses on the thermal and mechanical behavior of fiber-reinforced bio-epoxy materials in which the bio-content has been varied from 0 up to 100 %. Assorted formulations based on standard epoxy resin and epoxidized plant oil with varying bio-hardeners in differing matrix formulations, filler contents and fibers were used. DSC, TGA, DMA and HDT tests were carried out, as well as tensile and Charpy impact tests. The results show possible technical applications for bio-based epoxy materials.
Authors: M.T.M. Lufti, D.L. Majid, A.R.M. Faizal, Mazlan Norkhairunnisa
Abstract: Mechanical properties of formulated biocomposite between acrylonitrile-butadiene-styrene (ABS) polymer and kenaf whole stem (KWS) fibre have been investigated. This work has been done by alternating the KWSfibre loading with aim to propose the best formulation for preparing ABS/kenafbiocompositeby referring to its mechanical properties with the addition of processing aid.KWS fiber loading up from 10% to 50% are considered in this work and evaluated. It was found that by increasing the KWS fibre loading, the Young’s and flexural modulus of the ABS/kenafbiocomposite was subsequently increased too. Interestingly, the biocomposite strength decreased considerably while the impact strength drops significantly. ABS/kenafbiocomposite with 50% KWSfibre loading (C-50/50) has showed better performance compared to other formulation. However, a higher fibre loading was not considered presently as difficulties during compounding process are to be anticipated.
Authors: Gabriel Furtos, Laura Silaghi-Dumitrescu, Katarzyna Lewandowska, Alina Sionkowska, Petru Pascuta
Abstract: The development of polymer and inorganic filler lead to new biocomposite materials with a wide range of applications in orthopedic and dental application. Biomposites possess an excellent biocompatibility, biodegradability and superior mechanical properties. The inclusion of bioactive filler of hydroxyapatite, wollastonite glass-ceramics and bioactive glass could provide bioactivity of biocomposites. This review summarizes the recent work on the development of biocomposites containing biopolymers with different bioactive particles suitable for use in bone defects/bone regeneration and dental application.
Authors: Dragos Hodorogea
Abstract: Due to ecological and sustainability constraints, in late years we see great achievements in green technology in the field of materials science. The development of high-performance biocomposites (made from natural resources) is increasing worldwide. The challenge in working with natural fiber reinforced composites is the large spectrum of possibilities for making them.Biocomposites properties are influenced by a number of variables, including the fiber type, environmental conditions (where the plant fibers are sourced), processing methods, and any modification of the fiber. It is well known that recently exists a large interest in the industrial applications of composites containing biofibers reinforced with biopolymers. The characteristics of reinforcing fibers used in biocomposites, including source, type, structure, composition, as well as mechanical properties, will be reviewed. The variety of biocomposite processing techniques as well as the factors (moisture content, fiber type and content, coupling agents and their influence on composites properties) affecting these processes will be discussed.Techniques for processing the natural fiber reinforced composites will be discussed based on thermoplastic matrices (compression molding, extrusion, injection molding, and thermoforming), and thermosets (resin transfermolding, sheet molding compound). Their influence on mechanical performance (tensile, flexural and impact properties) will be evaluated. Finally, the work will conclude with recent developments and future trends of biocomposites.
Authors: Maizatulnisa Othman, Ibrahim Nor Azowa, C.M. Ruzaidi, Zakaria Mohd Nazarudin, Zahurin Halim
Abstract: Poly(lactic acid) (PLA) and kenaf bast fiber (KBF) were melt-blended using brabender into films in the PLA/KBF ratios of 100/0, 90/10, 70/30 and 50/50 for natural soil burial test. This formulation was used to study the biodegradability of PLA and PLA/KBF biocomposites. It was found that the decompositions of the biocomposite were faster than pure PLA. The SEM morphology of the tensile fracture surface of the 30% and 50% of PLA/KBF biocomposites presented larger pores and degradation areas than smaller KBF loading (10 wt%). This result shows that the addition of larger fibre loading to the PLA matrix increased the micropore surface area of the PLA/KBF biocomposite hence accelerated the decompositions time of the biocomposites.
Authors: J.K. Pandey, Won Shik Chu, C.S. Kim, Caroline S. Lee, Sung Hoon Ahn
Abstract: Cellulose nano whiskers (CNW) are recently known for their tremendous applicability in development of eco-friendly material for various applications. Present attempt was aimed to extract the nano crystals of cellulose from grass of Korea and fabricate the composites with poly (lactic acid) in presence of compatibilizer after modification. Functional group variation, thermal behavior, surface morphology, and crystallinity were monitored by FT-IR, TGA, SEM, and XRD respectively. The water sensitivity measurements were also carried out for study of moisture resistance of composites. It was found that CNW have lower thermal stability than alkali treated long fiber whereas the crystalline nature of composites decreased significantly. The effect of modification of whiskers on the mechanical properties was also discussed in which increase in modulus was observed.
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