Composite wood products
Hamid Ibaghi esfahani; mehdi kalagar; hosien sepahri rad
Abstract
In this study, the tensile and dynamic-mechanical properties of composites made by poly-lactic acid polymer (PLA) and high density polyethylene (HDPE) as matrix and sawdust to reinforcement 30 % weight were investigated. Maleic anhydride bonded with polyethylene (MAPE) was used to increase coupling agent ...
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In this study, the tensile and dynamic-mechanical properties of composites made by poly-lactic acid polymer (PLA) and high density polyethylene (HDPE) as matrix and sawdust to reinforcement 30 % weight were investigated. Maleic anhydride bonded with polyethylene (MAPE) was used to increase coupling agent by 3%. The use of sawdust increased the stiffness of composites while the use of this material reduced the tensile strength of composites. The highest tensile properties (elastic modulus and tensile strength) were related to poly lactic acid /polyethylene / sawdust / coupling agent composites. The addition of natural fibers to both matrices (PLA and MAPE) increased the composite storage modulus compared to pure polymers, while the modulus of storage in pure polyethylene and its composite was higher. Simultaneous use of two polymers with an equal ratio (33.5% by weight) and composite sawdust have shown the stiffness between the composites made with single polymers. The use of natural fibers reduced the mobility of the molecular chain and transported the temperature of the composite to higher temperatures, which eventually moved the corresponding corners to the right and lower. However, in some cases, the transmission of pixels has not followed the normal process. The addition of the coupling agent (MAPE) makes bonding more common between two phases in all composites and ultimately increases stiffness.
Composite wood products
Habib alah Khademieslam; Mehdei Kalagar
Abstract
In this investigation, tensile and physical properties of polypropylene (as matrix)/wheat straw fiber/paper mill sludge (as filler) composites was studied. The ratio of wheat straw fiber/ paper mill sludge was selected as 40/0, 30/10, 20/20, 10/30 and 0/40 (w/w) were used. Also, for better ...
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In this investigation, tensile and physical properties of polypropylene (as matrix)/wheat straw fiber/paper mill sludge (as filler) composites was studied. The ratio of wheat straw fiber/ paper mill sludge was selected as 40/0, 30/10, 20/20, 10/30 and 0/40 (w/w) were used. Also, for better compatibility between the two phases 3% MAPP as coupling agent was used. Mixing process was done in twin screw internal mixer extruder, and then composite samples were manufactured by injection molding. Result indicated that the tensile modulus of elasticity improved with increasing fillers and also it was observed that the toughness of composite increased when compared to the pure PP, while due to the usage of more paper sludge, these properties was improved. Tensile strength of composite decreased with adding 40% wheat straw fiber, but with addition of sludge tensile strength increased significantly. Adding wheat straw in PP matrix and its hydrophilic properties resulted in the highest rates of water absorption and thickness swelling. However, adding paper sludge and lower amount of lignocellulosic material, and the compatibilizer noticeably decreased the physical properties due to better bonding between two phases.
Composite wood products
Mehdi Kalagar; behzad baziyar; Habibalah Khademislam; Esmaeil Ghasemi; Amir homan Hemmasi
Abstract
In this paper, poly lactic acid (PLA)/ wheat straw fibers manufactured by twin screw extruder and molding compression have been studied. Wheat straw fibers were treated with trietoxymethel silane for better compatibility between two phases. Physical properties, tensile properties of the composites were ...
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In this paper, poly lactic acid (PLA)/ wheat straw fibers manufactured by twin screw extruder and molding compression have been studied. Wheat straw fibers were treated with trietoxymethel silane for better compatibility between two phases. Physical properties, tensile properties of the composites were analysis. The effect of the wheat straw fibers on the thermal properties of PLA has also been investigated in DSC experiments. The effects of silane treatment on the wheat straw fibers have been analyzed by FTIR. Scanning electron microscopy from samples surface were used for better study of water absorption and thickness swelling. Composites wheat straw fiber were treated shows signification lower water absorption and thickness swelling than composites PLA/ untreated wheat straw fibers. The lower amount of water absorption and thickness swelling occurred in the pure PLA. The existence crack and break occurred in the surface of PLA/ untreated wheat straw fibers composites after immersion in the water indicating higher water absorption and thickness swelling were in these samples. Wheat straw fibers were treated with silane due to better wetting and better linkage in the interfacial surface with PLA matrix showed higher tensile properties then PLA/ untreated wheat straw fiber composites. Differential scanning calorimeter test showed that with addition wheat straw fibers were treated to pure PLA the increased glass transition temperatures. The nucleating effect of wheat straw fibers, special treatment with silane cause to increased in the crystallization temperature composites than pure PLA which a positive effect showed on the degree of crystallization.
Composite wood products
Hamid Aibaghi esfahani; Mehdi Kalagar; Elham Marzban moridani
Abstract
In this study, mechanical properties of high density polyethylene (as matrix) and olive mill sludge (as filler / reinforcement) composites were investigated. There levels of paper sludge (15, 30, 40 and 50 wt %) were used to produce composites. The effect of maleic anhydride grafted polyethylene (MAPE) ...
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In this study, mechanical properties of high density polyethylene (as matrix) and olive mill sludge (as filler / reinforcement) composites were investigated. There levels of paper sludge (15, 30, 40 and 50 wt %) were used to produce composites. The effect of maleic anhydride grafted polyethylene (MAPE) as coupling agent on the mechanical properties composite was investigated and then, these composites (with coupling agent) were compared with composites without coupling agent. For blending materials from extruder and produce of mechanical standard sample from injection molding were used. Mechanical properties containing tensile properties (modulus of elasticity and tensile strength) and impact strength were studied. The result of obtaining from modulus of elasticity showed that with adding olive mill sludge to the polyethylene cause to signification increasing in modulus of elasticity were compared to pure polyethylene. Tensile strength composite increasing with adding olive mill sludge compared to pure polyethylene but maximum measure of tensile strength related to composites contain 30% olive mill sludge and coupling agent. Also adding 15% olive mill sludge to polyethylene cause to improved impact strength in compared pure polyethylene, but with adding more olive mill sludge (30, 40 and 50%), impact strength in composites were decreased. The used of coupling agent in the total manufactured composite cause to improved in impact strength of composites. The addition of a coupling agent (MAPE) to the composition resulted in an increase in mechanical properties of the composites that indicating enhanced matrix–olive mill sludge interfacial adhesion.
