Management and Economics wood
Eiraj Mansoryar; Alinaghi Karimi; Ghanbar Ebrahimi; Ahmad Mirshokraei; Sohrab Rahimi
Abstract
The water repellency and dimensional stabilization of wood species are important for outdoor uses. In this study, the water absorption and water repelling of poplar wood (Populus Alba) by emulsion of paraffin, Quaternary ammonium and starch, were investigated. Paraffin in three levels of 0%, 3%, 5%, ...
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The water repellency and dimensional stabilization of wood species are important for outdoor uses. In this study, the water absorption and water repelling of poplar wood (Populus Alba) by emulsion of paraffin, Quaternary ammonium and starch, were investigated. Paraffin in three levels of 0%, 3%, 5%, Quaternary ammonium in three levels of 0%, 1.5%, 2.5% and also starch in three levels of 0%, 1% and 2%(by weight) were selected as variables. A set of matched specimens were set aside as control, for making comparison. Results showed that the amount of paraffin had a positive significant effect on water absorption and water repellency that is increasing paraffin would improve these properties. Furthermore, specimens treated with paraffin had better water repellency than control samples. Based on the results, it is claimed that the treatment of 5% paraffin, 0-1.5% Quaternary ammonium and 0-1% starch will bring about water absorption and water repellency in treated specimens to a desired level, without causing any damage to other physical properties of them.
Management and Economics wood
Neda Esmaeeli; Maryam Ghorbani; pourya biparva
Abstract
This research was conducted to determine the optimal conditions for chemical modification of poplar wood with glutaraldehyde and its effect on the physical properties of products. Test samples were prepared according to the standard ASTM-D1037 and impregnated in the laboratory cylinders with Glutaraldehyde ...
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This research was conducted to determine the optimal conditions for chemical modification of poplar wood with glutaraldehyde and its effect on the physical properties of products. Test samples were prepared according to the standard ASTM-D1037 and impregnated in the laboratory cylinders with Glutaraldehyde at a concentration of 10% by using vacuum-pressure method. Modification reaction was done in two procedure. Heating first in the laboratory cylinder (Hydrothermal) for 4 hour and second in oven for 4 level 4,12,24,48 and 48hours. Weight percent gain of modified by hydrothermal and oven method was measured 2.10, 9.26, 10.02, 11.40 and 14.15% respectively. Chemical modification with glutaraldehyde by hydroxyl group's substitution, reduced the uptake of water and swelling of poplar wood. So that at the end of soaking in water the heating in the oven for 48 hours with minimum water absorption and dimensional changes in the 57.32 and 12.08 respectively, and highest bulking, ASE and ASE′ in 8.31,67 and 35.51% respectively was selected as the optimal level. This improvement compared to other modification levels demonstrates the forming of permanent Cross-linking of acetal that increased by Prolongation of the heating time.
Ramin Farsi; Ahmad Mirshokraee
Abstract
The conversion of biomass into biofuels which is a blend of alcohols and phenolic compounds has received significant attention in most countries. The purpose of this study was to identify the chemical composition of the pyrolysis oil products from Oak, Poplar woods, and Bagasse produced in a fixed bed ...
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The conversion of biomass into biofuels which is a blend of alcohols and phenolic compounds has received significant attention in most countries. The purpose of this study was to identify the chemical composition of the pyrolysis oil products from Oak, Poplar woods, and Bagasse produced in a fixed bed reactor at temperature of 573 oK. Identification of compounds in the extracted liquids was accomplished through making derivatives using GC - MS spectroscopy. Main compounds identified in our experiments comprised 1 - Phenanthrene carboxylic acid from oak wood, 1, 2 - benzene di carbocyclic acid base (2 – ethyl hexyl) ester from poplar wood, and Levoglucosan from bagasse at the levels of 42, 50 and 27 wt% of the reaction products, respectively.
Roholah Mohebi; Aghang Tajedini; Ahmad Jahan-Latibari; Amir Nourbakhsh
Abstract
The influence of different contents (0, 5 and 10% W/W)of silica and poplar wood powder ( 30 ,40 and 50% W/W of total weight of composite) on strength properties of Polypropylene/Wood powder/Silica composite was evaluated. Various components of composite was melt mixed using two screw counter retating ...
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The influence of different contents (0, 5 and 10% W/W)of silica and poplar wood powder ( 30 ,40 and 50% W/W of total weight of composite) on strength properties of Polypropylene/Wood powder/Silica composite was evaluated. Various components of composite was melt mixed using two screw counter retating extruder, followed by cooling and granulizing. Composite granules were injected into test samples. The results of strength properties measurements revealed that almost all strength values were improved. At higher content of silica, The MOR increased from 47.9 to 53.3 MPa, MOE from 2625 to 4517 MPa and MOE in tensile increased from initial value of 4525MPa (without silica) to 6884MPa (10% silica in composite). Marginal increase in tensile strength and Izod Impact strength was observed, but the hardness of the composite was improved from 66 to73.77 shoreD. At higher silica content, the density of the composite was higher, as expected.
Composite wood products
Homayon Solymani; Abolfazl Kargarfard; Amir Nourbakhsh
Abstract
In this investigation, particleboard manufacturing has been offered considering usage of lignocellulosic residues from recision of pomegranate trees in particleboard production using pomegranate and poplar(P.nigra) wood with 4 different combination (1. 100% of pomegranate wood ...
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In this investigation, particleboard manufacturing has been offered considering usage of lignocellulosic residues from recision of pomegranate trees in particleboard production using pomegranate and poplar(P.nigra) wood with 4 different combination (1. 100% of pomegranate wood 2. 75% of pomegranate wood and 25% of poplar wood 3. 50% of pomegranate wood and 50% of poplar wood 4. 100% of poplar wood as the control sample ) and using 2 resin consumption levels UF (10 & 12 %) and 2 press time levels (4&5 min.). According to these factors, 16 combination samples were totally collected and 3 boards from each treatment totally 48 experimental sample boards were made. The result of physical and mechanical properties were analyzed using Randomized Complete Block experimental Design ( RCBD ). The result of this investigation showed that Modulus of Rupture (MOR) in boards has effectively reduced while increasing the press time. On the other hand , resin consumption content and press time have a direct impression on Modulus of Rupture (MOR) and Modulus of Elastisity (MOE) in boards so that MOR and MOE decreased while 10% resin consumption and increasing the press time. These results also indicated that MOR and MOE of the boards have increased by adding poplar particles to the wood combination for board production. Indeed, Internal Bonding (IB) of boards has modified while 10% resin consumption and increasing the press time but IB has effectively decreased by 12% resin consumption and increasing the press time. Anyway, all the Internal Bonding average values for boards have been higher than the standard level. The results also showed that Thickness Swelling (TS) of boards has increased by adding poplar particles to the wood combination for board production.
