Composite wood products
Reza Hajihassani; Fardad Golbabaei; seyedeh masoomeh
Abstract
The aim of current research was to investigate effect of chemical treatment of poplar fibers on physical and mechanical properties of wood plastic composite. The samples were made from acetylated poplar fibers with different weight percent gains (WPGs of 0, 14.7 and 19.5%), two levels of fiber consumption ...
Read More
The aim of current research was to investigate effect of chemical treatment of poplar fibers on physical and mechanical properties of wood plastic composite. The samples were made from acetylated poplar fibers with different weight percent gains (WPGs of 0, 14.7 and 19.5%), two levels of fiber consumption (30 and 40%) as well as two levels of MAPP (0 and 3%). The samples were physically and mechanically tested. Afterward, the results were analyzed based on a complete randomized design (CRD) under a factorial experiment. Results revealed that the acetylation causes reduction of water absorption and thickness swelling and also improvement of some mechanical properties. Moreover, the results showed that the utilization of MAPP increases physical and mechanical properties of wood plastic composite. The research results showed that increasing of fiber consumption from 30 to 40% enhances water absorption, thickness swelling, tensile strength, tensile modulus as well as bending modulus, and also causes reduction of bending strength and impact resistance.
Composite wood products
Vahid Tazakor Rezaie; abdolah Najafi; Ahmad Sinaie
Abstract
In this study, effect of nano-wollastonite on fire resistance characteristics of wood flour/polypropylene composite was investigated. The composites samples were manufactured using a dry blend/hot press method. In this study, the dried wood flour of beech as the filler in a 60%, poly propylene as the ...
Read More
In this study, effect of nano-wollastonite on fire resistance characteristics of wood flour/polypropylene composite was investigated. The composites samples were manufactured using a dry blend/hot press method. In this study, the dried wood flour of beech as the filler in a 60%, poly propylene as the matrix in a 37% and polyethylene grafted with maleic anhydride as the coupling agent in a 3% total weight was used. Also, nano-wollastonite was used in four levels of dried wood flour loading (0, 1, 3 and 5%). Nominal density and dimensions of the composites were 1 g/cm3 and 1*20*25 cm, respectively.Bending strenght according to ASTM standard and Fire resistance characteristics such as, flammability duration, duration of flame after removing the burner, duration of glow after removing the burner and mass reduction were measured acceding to ISO 11925. Results indicated that by increasing the nano-wollastonite increases the bending strengh,MOE and flammability duration increased but mass reduction, duration of flame and duration of glow decreased. Also the dispersion of nano-wollastonite in composites was evaluated by Filed Emission Scanning Electron Microscopy (FE-SEM).
Misam Zahedi; Taghi Tabarsa
Abstract
In this study, the possibility of using canola tree stem residues and nanoclay particles on physical, mechanical and morphological properties of canola wood flour – polypropylene composites was investigated. The weight ratio of canola wood flour and polypropylene in the mixture was 50% and 50%and ...
Read More
In this study, the possibility of using canola tree stem residues and nanoclay particles on physical, mechanical and morphological properties of canola wood flour – polypropylene composites was investigated. The weight ratio of canola wood flour and polypropylene in the mixture was 50% and 50%and 0, 3 and 5 percent nanoclay and 4% MAPP were used. First, the ingredients were mixed using the extruder and then final panels were produced by hot pressing the compoud. Physical and mechanical properties were measured. Results indicated that water absorption and thickness swelling of the composites decreased as the nanoclay content was increased. The screw and nail withdrawal strength of wood plastic composite increased with increasing nanoclay up to 3% percent, then decreases with the increasing nanoclay to 5%. Morphologies of the nanocomposites were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the results showed increased d-spacing of clay layers indicating enhanced compatibility between polypropylene and nanoclay and canola stalk flour.
َ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 ...
Read More
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.
Neda Moradpour; Mohammad reza Mastari frahani; Alireza Shakeri
Abstract
To investigate the effect of acetylation and antioxidant separately and together on discoloration and contact angle wood plastic composite due to weathering , composite s were made using popular wood flour and high density polyethylene . the sample were exposed to natural weathering for 6 ...
Read More
To investigate the effect of acetylation and antioxidant separately and together on discoloration and contact angle wood plastic composite due to weathering , composite s were made using popular wood flour and high density polyethylene . the sample were exposed to natural weathering for 6 months.
The results have shown that acetylation can relatively reduce the discoloration of weathered sample treatment than control sample.the antioxidant does not have any influence on color change but it seems that antioxidant could prevent partly destruction of plastic .
It should be mention acetylating increased the surface contact angle befor weathering. But it could not protect the sample surface after the exposure period. So that was zero after weathering.
Composite wood products
Fatemeh Taheri; Ali akbar Enayati; Abdol rasol Oromihei; Mehdi Tajvidi
Abstract
By utilizing three different grades of Polypropylene (PP) as matrix, two different kind of MAPP as coupling agent and without MAPP and Pistachio's flour, composite samples were produced. Physical and mechanical properties of wood plastic composites including: MOR, MOE, tensile strength, bending ...
Read More
By utilizing three different grades of Polypropylene (PP) as matrix, two different kind of MAPP as coupling agent and without MAPP and Pistachio's flour, composite samples were produced. Physical and mechanical properties of wood plastic composites including: MOR, MOE, tensile strength, bending strength, impact strength, hardness, water absorption and thickness swelling (816 hours) were determined. Results indicated that the effect of different grade of polypropylene and coupling agent on water absorption, thickness swelling, hardness and impact strength variables were insignificant. Use of Polypropylene having higher Melt Flow Index (MFI) leads to increase in mechanical properties of wood plastic composite samples such as Bending and Tensile strength even if coupling agent wasn't used. Use of different kind of MAPP as coupling age in making wood plastic composites can result in better mechanical properties which based on their type have different effect.
Management and Economics wood
Sayed mahmood Kazemi; Mehran Jalilvand
Abstract
Wood Plastic Composite as new wood component products is made by wood fiber or powder elements with thermoset or thermoplastic materials. In recent periods of ten years the components have been produced by west industrial countries and as well in UnitedState of America as wood water resistant materials. ...
Read More
Wood Plastic Composite as new wood component products is made by wood fiber or powder elements with thermoset or thermoplastic materials. In recent periods of ten years the components have been produced by west industrial countries and as well in UnitedState of America as wood water resistant materials. Samples of wood plastic and untreated wood specimens of maple and elm were prepared in laboratory. The effects of water, fire and fungus (Trametes versicolor) on the wood samples with using ASTM and EN standards were investigated. The results showed that the highest resistance wood samples against fire was related to wood plastic made by polypropylene and the lowest resistance of wood samples was associated to untreated maple. In the case of floating samples in water, results indicated that increase cross section of wood plastic decreases the rate of water penetration in wood samples. The results of fungal attack in laboratory tests on wood plastic samples showed that component made by 30 % polypropylene and 30% polyethylene and 40% wood fiber is able to resist significantly against rotting fugal.
The weight loss of untreated maple samples against fungal attack was 38.5% that probably is related to being high percent of sugar and starch materials in wood species. There was a difference about 3% of weight loss between natural maple (control) and maple treated by sea water. Therefore, maple is a perishable species in wood durability classification. Heartwood of elm was very resistant to wood rotting fungus and the mean weight loss of wood samples was 3.75%. As a result in wood classification this wood specie is very durable. Appling of sea water only 0.5% increased wood resistance to fungal activity. The results of fungus attack on wood plastic showed this wood product is very resistant and during 6 weeks incubation only 3.14% of its weight was decreased.
