Polyurethane-solid wood composites prepared with various catalysts. I. Mechanical properties and dimensional stabilities

2009 ◽  
Vol 111 (3) ◽  
pp. 1293-1299 ◽  
Author(s):  
Zhenhua Gao ◽  
Di Wu ◽  
Wenqiang Su ◽  
Xiaoling Ding
Keyword(s):  
Mechanical Properties ◽  
Solid Wood ◽  
Wood Composites

Study of Fire Retardancy and Thermal and Mechanical Properties of HDPE-Wood Composites

2015 ◽  
Vol 35 (6) ◽  
pp. 412-423 ◽  
Author(s):  
Ljerka Kratofil Krehula ◽  
Zvonimir Katančić ◽  
Gojko Marić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Mechanical Properties ◽  
Wood Composites ◽  
Thermal And Mechanical Properties ◽  
Fire Retardancy

Understanding the effect of copolymer content on the processability and mechanical properties of polyhydroxyalkanoate (PHA)/wood composites

2019 ◽  
Vol 124 ◽  
pp. 105437 ◽  
Author(s):  
Clement Matthew Chan ◽  
Luigi-Jules Vandi ◽  
Steven Pratt ◽  
Peter Halley ◽  
Yiming Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wood Composites

Polyurethane-solid wood composites. II. Flammability parameters

2009 ◽  
Vol 113 (5) ◽  
pp. 3279-3285 ◽  
Author(s):  
Zhenhua Gao ◽  
Wenqiang Su ◽  
Di Wu
Keyword(s):  
Solid Wood ◽  
Wood Composites ◽  
Flammability Parameters

Mode III fracture energy of wood composites in comparison to solid wood

1999 ◽  
Vol 33 (5) ◽  
pp. 391-405 ◽  
Author(s):  
R. J. A. Ehart ◽  
S. E. Stanzl-Tschegg ◽  
E. K. Tschegg
Keyword(s):  
Fracture Energy ◽  
Solid Wood ◽  
Wood Composites ◽  
Mode Iii

scholarly journals Physical and mechanical properties of impregnated polystyrene jabon (Anthocephalus cadamba) glulam

2021 ◽  
Vol 891 (1) ◽  
pp. 012007
Author(s):  
Y S Hadi ◽  
E N Herliyana ◽  
I M Sulastiningsih ◽  
E Basri ◽  
R Pari ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Moisture Content ◽  
Physical And Mechanical Properties ◽  
Solid Wood ◽  
Hot Water ◽  
The Other ◽  
Modulus Of Rupture ◽  
Glued Laminated Timber ◽  
Anthocephalus Cadamba

Abstract Jabon (Anthocephalus cadamba) laminas were impregnated with polystyrene and reached 21.2% polymer loading. The laminas were manufactured for three-layer glued laminated timber (glulam) using isocyanate glue with glue spread 280 g/m2 and cold-press process. For comparison purposes, untreated glulam as control and also solid wood were prepared. The physical-mechanical properties were evaluated according to the Japanese Agricultural Standard (JAS) 234-2003. The results showed that the color of glulam was not different from polystyrene glulam. The density of polystyrene glulam was higher than untreated glulam and solid wood, but the moisture content was lower than the other. The product kinds of solid wood, untreated glulam, and polystyrene glulam did not affect shear strength and modulus of rupture (MOR), while the modulus of elasticity (MOE) of untreated glulam and hardness of polystyrene glulam were the highest values and the other products were not different one each other. Both kinds of glulam fulfilled the Japanese standard in terms of moisture content, MOR, and delamination in hot water, but MOE and shear strength did not. Regarding its advantages, polystyrene glulam could be further developed using a higher wood density.

scholarly journals Influence of Veneer Density on Plywood Thickness and Some Mechanical Properties

2021 ◽  
Vol 46 (341) ◽  
pp. 66-74
Author(s):  
Laimonis Kūliņš ◽  
Anete Meija ◽  
Rihards Roziņš ◽  
Kārlis Hermanis Liepa ◽  
Uldis Spulle
Keyword(s):  
Mechanical Properties ◽  
Symmetry Axis ◽  
Scientific Literature ◽  
Common Knowledge ◽  
Wood Fiber ◽  
Solid Wood ◽  
Wood Fibers ◽  
Tensile Shear ◽  
Wood Moisture ◽  
Direct Production

Abstract It has been common knowledge that as the density of wood increases, the mechanical properties also improve. In turn, the density of wood depends on many factors, including the wood moisture content, location and cross-section in the trunk, the type of treatment and the parameters of technological processes. There is a great deal of research reported in the scientific literature on the effect of solid wood density on mechanical properties for different wood species as well as for structural timber. However, no research data can be found related investigation of the influence of veneer density on the properties of the birch plywood. In the present study, researching the properties of 7-ply birch plywood (thickness 9 mm), it was concluded that as the density of veneers increases, the bending properties of plywood in the direction of wood fibers (covered veneers) increases. When determining the plywood gluing quality, similar tendencies have been observed. For plywood with a lower density in all veneer plies the gluing quality (tensile-shear test) for perpendicular wood fiber veneers increases in the direction from the symmetry axis or middle veneer to the plywood outer plies, which can be explained by the fact that the outer plies become denser at the time of the hot pressing process. The results of the study will allow birch plywood manufacturers in direct production, sort veneers by density, to produce plywood with very predictable gluing quality, plywood thickness and mechanical properties in bending.

Mechanical properties and water absorption behaviour of PLA and PLA/wood composites prepared by 3D printing and injection moulding

2019 ◽  
Vol 25 (4) ◽  
pp. 672-678 ◽  
Author(s):  
Josef Valentin Ecker ◽  
Andreas Haider ◽  
Ivana Burzic ◽  
Axel Huber ◽  
Gerhard Eder ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Water Absorption ◽  
Tensile Properties ◽  
Injection Moulding ◽  
Water Storage ◽  
Wood Composites ◽  
Content Type ◽  
Influence Of Water ◽  
3D Printed

Purpose This papers aims to study the influence of water absorption on the mechanical properties of poly lactic acid (PLA) and PLA/Wood composites. Virgin PLA and PLA/Wood double-bone-shaped specimens were prepared by two methods: injection moulding and 3D printing. The results were compared to each other and showed the influence of the production method on the properties of the produced parts. Design/methodology/approach Morphology studies were done by scanning electron microscopy (SEM) from fracture surfaces of tensile and notched impact specimens of all samples. Tensile properties were analysed by the production and testing of dog-bone-shaped samples. Heat deflection temperature (HDT) was tested, as also was the crystallinity of the tested samples by differential scanning calorimetry. Findings The values for notched impact strength were higher upon water uptake in the case of injection-moulded specimens, which was not the case with 3D-printed specimens. Tensile properties of the specimens produced by both methods were reduced after water absorption tests. Values of the HDT were also lower after water absorption tests studied for both processing methods. Originality/value Morphology studies were done by SEM from fracture surfaces of tensile as well as notched impact specimens of injection-moulded and 3D-printed samples. The effect of water storage on various samples was tested. The two different production technologies were compared to each other owing to their influence of water storage. This study also dealt with NFC compounds and produced NFC composites and the influence of water storage on these samples.

Extrusion of MOC-Based Panel

2008 ◽  
Vol 400-402 ◽  
pp. 263-267
Author(s):  
Xiang Yu Li ◽  
Hui Su Chen ◽  
Chung Kong Chau ◽  
Zong Jin Li
Keyword(s):  
Mechanical Properties ◽  
Cross Sections ◽  
Chloride Solution ◽  
Extrusion Process ◽  
Wood Composites ◽  
Magnesium Chloride Solution ◽  
Wood Particles ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Extrusion Technology

Magnesium Oxychloride Cement (MOC) is an air-hardened material with chemical reaction between magnesium oxide and magnesium chloride solution. It has many properties superior to Portland cement. It does not need wet curing, has very good fire resistance, low thermal conductivity. In this study, wood composites were developed by using MOC as binder and wood powders as filler. It was demonstrated that MOC was suitable for binding wood particles in large quantities. In order to ensure smooth extrusion process, additives and rheological modifiers were used to modify the rheology behaviors and properties of the mixture and the rheology behaviors of fresh materials were also investigated with upsetting and relaxation tests simultaneously. Then MOC-based panels with different cross-sections were produced by using extrusion technology and mechanical properties of them were investigated.

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