Composite wood products
Mohammad Farsi; Asghar Tabei; Fatemeh Maashi sani; masoud ebadi
Abstract
The purpose of this research is to investigate the physical and mechanical properties of the wood-plastic nanocomposite obtained from Raw and Functionalized carbon nanotubes (CNTs). For this purpose, wood flour at a fixed amount of 50%, Raw CNTs at three levels of 0, 1 and 2% and coupling agent at two ...
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The purpose of this research is to investigate the physical and mechanical properties of the wood-plastic nanocomposite obtained from Raw and Functionalized carbon nanotubes (CNTs). For this purpose, wood flour at a fixed amount of 50%, Raw CNTs at three levels of 0, 1 and 2% and coupling agent at two levels of 0 and 3% were used in HDPE matrix. Also, Functionalized CNTS were used to strengthen the efficiency of nanocomposites at 1 and 2% levels separately. The materials were mixed together in an internal mixer (Haake) and then the samples were made by a hot press machine. The results showed that by increasing the amount of CNTs from 0 to 2% wt, the tensile strength and modulus of the samples increased by 58.8% and 12.6% respectively, and water absorption and thickness shrinkage decreased by 54.5% and 19.4% respectively. Composites containing 2% wt of CNTs showed higher impact resistance compared to control samples. The coupling agent had a positive effect on the performance of nanocomposites. The physical and mechanical properties of the samples were significantly improved by adding the coupling agent and Functionalized CNTs. The results were also confirmed by scanning electron microscopy.
Composite wood products
Hamid Ibaghi esfahani; Mehdi Kalagar; Hossein Sepehridad
Abstract
To study the tensile properties and impact strength in Wood Plastic Composites (WPC) polypropylene as a matrix and teada pine sawdust as reinforcement / filler is used. Ethylene / propylene / Diane / monomer (EPDM) as modified impact resistance with 10, 20 and 30 percent improved impact resistance and ...
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To study the tensile properties and impact strength in Wood Plastic Composites (WPC) polypropylene as a matrix and teada pine sawdust as reinforcement / filler is used. Ethylene / propylene / Diane / monomer (EPDM) as modified impact resistance with 10, 20 and 30 percent improved impact resistance and maleic anhydride grafted polypropylene (MAPP) at a rate of 3 percent as a fasteners to improve response and polymers and fillers were added to the composite. To evaluate the fracture surface of a structure scanning electron microscope (SEM) was used. The apply of 10 % elastomer and 3 % coupling agent cause to improved of tensile properties and the use of higher levels of elastomer (20 and 30 %) has shown a decreasing trend in these properties. The results showed that PP matrix by adding sawdust to a significant reduction in impact strength of composite than pure PP is observed. An EPDM additive used in all contents of composites PP / sawdust has improved impact strength. Simultaneous use of EPDM and MAPP used a positive effect in tensile properties and impact strength. The apply of EPDM (30%) and 3% (MAPP) has demonstrated the highest level of impact strength. SEM images show that the use of EPDM and MAPP composites will improve the connection of interface.
Composite wood products
Alireza Beiazyat; Laya Jamalirad; Hedayat alah Aminian; Sahab Hejazi
Abstract
In this research, the effect of the wood filler content and coupling agent (MAPP) on the physical and mechanical properties of Polypropylene reinforced with palm wood flour from the annual pruning of palm leaves (Shahani species) composite, were studied. For this purpose, the palm wood flour in three ...
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In this research, the effect of the wood filler content and coupling agent (MAPP) on the physical and mechanical properties of Polypropylene reinforced with palm wood flour from the annual pruning of palm leaves (Shahani species) composite, were studied. For this purpose, the palm wood flour in three levels of 30%, 40%, 50% and two levels of Maleic anhydride grafted polypropylene 4% and 6% were used as variable factors. Then, the Physical and mechanical properties of samples, including thickness swelling after 2 and 24 hours of immersion in water, bending strength, bending modulus, tensile strength, tensile modulus and impact strength, were measured.The results showed that by increasing palm wood flour, the bending strength, tensile strength and impact strength were decreased but the thickness swelling, bending modulus, tensile modulus were increased. It was also found that by adding MAPP, thickness swelling, bending strength, bending modulus, tensile strength and tensile modulus were improved. The results revealed that at increased consumption of palm wood flour and adding coupling agent leads to improve quality of the interface and significant changes especially dimensional stability and MOE, are achieved.
Physics and Mechanical Wood
Ali Kazemi tabrizi; Amir Nourbakhsh; Javad Sepidehdam
Abstract
In this study, the effect of fish waste powder, base material polyethylene , and also the quantity of coupling agent (MAPE) on physical and mechanical properties of wood-plastic composite were studied. For this purpose, wood powder at 40% was mixed with 60% of HDPE. Fish waste in three levels (5, 10 ...
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In this study, the effect of fish waste powder, base material polyethylene , and also the quantity of coupling agent (MAPE) on physical and mechanical properties of wood-plastic composite were studied. For this purpose, wood powder at 40% was mixed with 60% of HDPE. Fish waste in three levels (5, 10 and 15%) mixed into wood powder and coupling agent on three levels (0, 2 and 4) of HDPE in a blender at 180 °C and a speed rotating of 50 rpm, and samples were made with using of injection molding for standard tests. The mechanical properties: tensile and bending strength, bending and tensile modulus were investigated according of ASTM standards. This result suggests that increasing the amount of fish powder waste to 10%, increased bending strength while other strengths diminished. The amounts of all strengths were increased by increasing in percentage of coupling agent to 4%.The results shows that fish waste was suitable as a new material for wood plastics composites.
َAbdolah Shakeri; Vahid Reza Safdari; Mehran Rohnia; Amir Nourbakhsh
Abstract
Coupling agents in wood fiber reinforced plastic composites play an important role inimproving compatibility and adhesion between polar wood fiber and non-polar polymermatrices by forming bridges of chemical bonds between the fiber and the matrix. Maleatedpolyethylene (MAPE) and diisocyanate (HMDI) are ...
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Coupling agents in wood fiber reinforced plastic composites play an important role inimproving compatibility and adhesion between polar wood fiber and non-polar polymermatrices by forming bridges of chemical bonds between the fiber and the matrix. Maleatedpolyethylene (MAPE) and diisocyanate (HMDI) are two most common coupling agents whichare subject to evaluation, singly and in mixture. Polypropylene and wood fibers werecompounded with Maleated polyethylene (MAPE) and diisocyanate (HMDI) in concentration of2% and 4% in solitary form and mixture form (HMDI %2 + MAPE %2) into pellets using acounter-rotating twin-screw extruder and mechanical test specimens were prepared by injectionmolding. The result showed that adding 4% MAPE and 2% HMDI individually lead to increasein flexural and tensile strength of the composites. Also adding (%2HMDI + %2MAPE) causedan increase of flexural, tensile and in particular the impact strength.
Habib alah Khademi eslam; Zahra Yoosefnia; Esmaeil Ghasemi; Mohammad Talaeipoor
Abstract
The effect of nanoclay and coupling agent contents on the mechanical properties of wood flour/ polypropylene/ nanoclay composites was investigated. Wood flour content was constant at 40%, maleic anhydride at two levels of 2 and 4% and nanoclay (Cloisite 30B) at four levels of 0, 1, 3 and 5% were used. ...
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The effect of nanoclay and coupling agent contents on the mechanical properties of wood flour/ polypropylene/ nanoclay composites was investigated. Wood flour content was constant at 40%, maleic anhydride at two levels of 2 and 4% and nanoclay (Cloisite 30B) at four levels of 0, 1, 3 and 5% were used. The materials were mixed in an internal mixer at 180 o C, 60 rpm for 12 minutes, and then the specimens were fabricated by injection molding method. The mechanical properties such as tensile and flexural strength, flexural modulus and impact strength were measured. The nanoclay dispersion was examined by X-ray diffraction. The results indicated that the tensile and flexural strength, and the flexural modulus increased with increasing the nanoclay, but impact strength decreased. The tensile and flexural strength, flexural modulus increased as the compatibilizer content increased from 2 to 4%, but impact strength was decreased. The structural examination of the wood polymer nanocomposite with X-ray showed that nanoclay was distributed as intercalation structure in polymer matrix, and the d-spacing of layers were increased with increasing of nanoclay particles content.
Composite wood products
Hassan Zyaei; Habib alah Khademi eslam; Behzad Bazyar; Noraldin Nazarneghad
Abstract
The aim of this study was to determine effect of coupling agent contents on the thermal properties and nanoclay dispersion of reed flour /polypropylene /nanoclay composites. For this purpose we considered wood flour 40% fixed maleic anhydride in two levels (5% and 10%) and nanoclay (Cloisite 10A) in ...
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The aim of this study was to determine effect of coupling agent contents on the thermal properties and nanoclay dispersion of reed flour /polypropylene /nanoclay composites. For this purpose we considered wood flour 40% fixed maleic anhydride in two levels (5% and 10%) and nanoclay (Cloisite 10A) in three levels (0, 1 and 3%). The materials were mixed in an internal mixer with 175 oC, 60 rmp for 10 minutes and then the specimens were fabricated by injection molding method. The clay structure and dispersion processes have been studied by X-ray diffraction. Thermal characterizations of the nanocomposites were carried out using Differential Scanning Calorimeter (DSC). The results revealed that Enthalpy, Crystallinity and Crystalline temperature of composites were increased by adding up of coupling agent and nanoclay (in some levels) contents. The XRD patterns show the exfoliation structure of nanoclay that indicated on a good dispersion of clay in polymer matrix, which turn in a reason for increasing thermal properties.
Composite wood products
Fataneh Azad; Mohammad mehdi Faezipoor; Mehdi Tajvidi
Abstract
In order to investigate the effect of compatibilizer, (MAPP), on physical and mechanical properties of reed stem flour- polypropylene composites, 60 mesh size reed stem flour particles were compounded at 60% and 70% by weight with a polypropylene homopolymer with a melt flow index of 18 g/10min. Two ...
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In order to investigate the effect of compatibilizer, (MAPP), on physical and mechanical properties of reed stem flour- polypropylene composites, 60 mesh size reed stem flour particles were compounded at 60% and 70% by weight with a polypropylene homopolymer with a melt flow index of 18 g/10min. Two compounds were prepared from which formulations with 60 mesh particle size and 60% and 70% filler loading were selected to evaluate the role of the compatibilizer. One of them was without MAPP and the other one had 3% MAPP by weight. Totally, 4 compounds were prepared. Composites were produced using a twin screw counter rotating extruder. Then, mechanical tests including static flexural test, tensile test, Izod impact test and hardness test were carried out. Physical tests including water absorption and thickness swelling were also performed. All testing was in accordance with ASTM D7031-04 specification. The results of physical tests have indicated that by the increase in reed flour content, maximum water absorption and maximum thickness swelling increased. Generally, by adding the coupling agent (MAPP), the physical and mechanical properties significantly improved.
Behnaz Dadkhahi tehrani; Asghar Omidvar; Ali akbar Ramtin
Abstract
In this research, the possibility of using lignocellulosic fibers with polypropylene was studied. Three weight percentages of bagasse flour namely 40, 55 and 70 percent were chosen. MAPP was used as coupling agent at two weight percentages namely 4 and 6 percent. Bending strength was measured applying ...
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In this research, the possibility of using lignocellulosic fibers with polypropylene was studied. Three weight percentages of bagasse flour namely 40, 55 and 70 percent were chosen. MAPP was used as coupling agent at two weight percentages namely 4 and 6 percent. Bending strength was measured applying Instron 6025. Fracture surface was stadied using SEM to evaluate the interface between plastic and fiber. The results showed that with increasing bagasse, stress and work at yield point of bending was decreased and modulus of bending was increased. Also, increasing coupling agent resulted in improving stress, modulus and work at yield point of bending. SEM results showed that with increasing coupling agent, interface between plastic and bagasse fibers was improved.
