Alireza Asgari; Amirhooman Hemmasi; Behzad Baziyar; Mohammad Talaeipour; Amir Nourbakhsh
Abstract
The mechanical (tensile strength and modulus, bending strength and modulus), humidity (water absorption and thickness swelling) and biodegradability properties of wood-plastics produced from polypropylene and poplar wood-flour (wood flour in three levels of 0, 20 and 25 percentage) in the presence of ...
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The mechanical (tensile strength and modulus, bending strength and modulus), humidity (water absorption and thickness swelling) and biodegradability properties of wood-plastics produced from polypropylene and poplar wood-flour (wood flour in three levels of 0, 20 and 25 percentage) in the presence of starch powder (at four levels of 0, 5, 10 and 15 percentage) are assessed as a bio strength agent. The material mixing process is run in two stages of applying an extruder machine and applying an internal mixer haake machine. The mechanical and humidity tests specimens are produced by mold injection method and the biodegradability test specimens are formed by hot press method. The tests are run according to standards and procedures. The results indicate that an increase in weight percentage of wood-flour in the composition, increase the mechanical strength, water absorption, thickness swelling and biodegradability of composites. An increase in weight percentage of starch powder in the composition, increase the bending strength and modulus, tensile modulus, water absorption, thickness swelling and biodegradability of composites, while decreasing the tensile strength. Additional studies run through the scanning electron microscopy indicate that by adding wood-flour and starch powder to the composition, the intensity of biodegradation increase at the surface of the specimens. By adding starch powder to the composition, the starch powder particles fill the cavities in the composite structure, thus a reduction in the volume of the pores in the composite structure.
Composite wood products
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.
Composite wood products
Elham Ostadi; Jalil Morshedian; Yosef Jahani
Abstract
In this research the influence of using waste Poly Ethylene Terephthalate on the mechanical and rheological properties of wood flour filled PP composites has been studied. PET contents varied from 10-33 wt%. Mechanical properties were characterized by tensile testing, while their fracture resistance ...
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In this research the influence of using waste Poly Ethylene Terephthalate on the mechanical and rheological properties of wood flour filled PP composites has been studied. PET contents varied from 10-33 wt%. Mechanical properties were characterized by tensile testing, while their fracture resistance was determined by impact measurements. The melt rheological behavior of the composites was also studied by a rheometer in the oscillatory mode and dynamic rheological properties such as complex viscosity, storage modulus, loss modulus and damping factor were evaluated at190°C. The results showed that stiffness increases by adding waste Poly Ethylene Terephthalate. PET when added in low concentrations, caused tensile strength to be lower than that of PP composites filled with pure wood flour. Increasing the concentration of waste PET, led to composites with higher amount of tensile strength. The samples containing waste PET had higher complex viscosity and storage modulus than composite without PET. Likewise, it was observed that the damping factor in the PP/Wood composite decreased by incorporating waste PET to the compositions. Key words: waste polyethylene terephthalate, polypropylene, wood flour, mechanical properties, rheological behavior
Hossein Rangavar; Abdolrasool Oromiehie; Arsalan Safarpour; Taherh Gholipour
Abstract
The present study investigated the application of recycled polyvinyl chloride (PVC) in wood-plastic composite. Wood flour having the particle size of 150 mesh, was produced from a mixture of different hardwoods and used as filler at three levels of 30, 40, and 50% based on the dry-weight of the composite. ...
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The present study investigated the application of recycled polyvinyl chloride (PVC) in wood-plastic composite. Wood flour having the particle size of 150 mesh, was produced from a mixture of different hardwoods and used as filler at three levels of 30, 40, and 50% based on the dry-weight of the composite. Three types of PVC were used as the matrix (100% virgin PVC, 100% recycled PVC, and a mixture of the equal weight of virgin and recycled PVC). Maleic anhydride grafted polypropylene (MAPP) was used as the coupling agent at a fixed dosage of 5% based on the PVC weight. The composite panels were produced using injection molding and the physical and mechanical properties of the final boards were evaluated according to ASTM standard test methods. Results showed that the utilizing the mixture of virgin and recycled PVC increased the bending strength and modulus of elasticity. Water absorption was also increased. However, impact resistance and elongation at yield point were decreased. At higher wood flour content up to 40%, flexural strength was increase indicating that the resin properly encapsulated the wood flour particles and at higher wood flour dosage, elongation and Izod impact resistance was reduced.
Babak Mirzaei; Kazem Dosthosseini
Abstract
Lignocellulosic material used as raw material in pulp and paper production due to major chemical alterations produce different waste compounds and composite manufacturing is an area providing the opportunity to utilize such wastes. In order to investigate the feasibility of using papermaking sludge in ...
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Lignocellulosic material used as raw material in pulp and paper production due to major chemical alterations produce different waste compounds and composite manufacturing is an area providing the opportunity to utilize such wastes. In order to investigate the feasibility of using papermaking sludge in composite production, four combinations of wood flour/ papermaking sludge/ high density polyethylene ratio were formulated, then composite panels were made and the physical properties of manufactured panels were evaluated. The content of maleated polyethylene (MAPE) and the polymer was constant 2% and 38% respectively, for all formulations. The results indicated that long term water absorption in particular thickness swelling decreased with increasing sludge content. Furthermore, moisture diffusion coefficient of samples containing 30% sludge and 30% wood flour was more than others. The results revealed that using papermaking sludge can be an alternative option for lignocellulosic raw material.
Composite wood products
Alireza Ghotibi far; Saeid Kazemi najafi; Rabi Behroz
Abstract
This research focused on the influence of content (5, 10 and 15 %) of glass fiber on the water absorption and thickness swelling of wood flour/E-glass fiber hybrid polypropylene composites without and with MAPP. The samples (strips with 10 mm thickness and 70 mm width) were made using a laboratory twin-screw ...
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This research focused on the influence of content (5, 10 and 15 %) of glass fiber on the water absorption and thickness swelling of wood flour/E-glass fiber hybrid polypropylene composites without and with MAPP. The samples (strips with 10 mm thickness and 70 mm width) were made using a laboratory twin-screw extruder. The water absorption and thickness swelling of the composites after 2h and 24h were determined. The results showed that adding glass fiber significantly increase water absorption and thickness swelling after 2h and 24h in absence of MAPP. Whereas in presence of 2% MAPP by addition glass fiber, no significant changes were observed in water absorption and thickness swelling of the composites after 2h and 24h. MAPP considerably decreased the water absorption and thickness swelling of the studied composites
Amir Nourbakhsh; Bohuslav V.Kokta; Abdolrahman Hosseinzadeh; Ahmad Jahan latibari; Abolfazl Kargarfard
Abstract
This study investigates the effect of maleic anhydride polypropylene (MAPP) addition as a coupling agent at four levels and also the type of cellulosic materials as a reinforcing component on processing and mechanical properties of modified Populus deltoides fiber and flour/ polypropylene composites.The ...
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This study investigates the effect of maleic anhydride polypropylene (MAPP) addition as a coupling agent at four levels and also the type of cellulosic materials as a reinforcing component on processing and mechanical properties of modified Populus deltoides fiber and flour/ polypropylene composites.The results indicate that the interfacial bond between reinforcing-fiber/ flour and the matrix show great influence on the mechanical properties of composites. Furthermore it has been demonstrated that the addition of coupling agent during processing significantly improves the mechanical properties of fiber/ flour polypropylene composites. The results of this investigation indicates that the highest the mechanical properties of composites are as follow; The mechanical properties of the poplar fiber with 2% MAPP is higher than poplar flour without MAPP, which proves that the addition of functional group C=O acts as a good bonding agent. The notched Impact Izod strength value of poplar fiber with 2% MAPP is less than pure PP. But it is higher than other treatments. The results indicate that the interfacial bond between reinforcing fibers and flour with polymer matrix modified MAPP play a significant role in improving the measured mechanical properties of the composites.
