Effect of the delignification of wood fibers on the mechanical properties of wood fiber–polypropylene composites

2006 ◽  
Vol 102 (5) ◽  
pp. 4759-4763 ◽  
Author(s):  
Alinaghi Karimi ◽  
Saleh Nazari ◽  
Ismaeil Ghasemi ◽  
Mehdi Tajvidi ◽  
Ghanbar Ebrahimi
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Wood Fibers ◽  
Polypropylene Composites

Study on Mechanical Properties of Wood Fiber/Polypropylene Composites

2010 ◽  
Vol 123-125 ◽  
pp. 1195-1198 ◽  
Author(s):  
Alireza Ashori
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Sample Preparation ◽  
Coupling Agent ◽  
Wood Fiber ◽  
Wood Fibers ◽  
Polypropylene Composites ◽  
Fiber Loading ◽  
Four Levels ◽  
Properties Of Composites

In this study, the effect of wood fiber concentrations on the mechanical properties of composites, prepared by using MAPP as the coupling agent, was investigated. In the sample preparation, four levels of fiber loading and three compounding temperatures were used. Most major changes in composite performance occurred at fiber contents above 30 wt%.The results clearly showed that the fiber loading of 30 and 40 wt% at 190oC was provided adequate reinforcement to increase the tensile and flexural strength of the PP powder. The modulus also increased with increasing the fiber content, because poplar fibers are believed to be more rigid than polymer. However, the addition of wood fibers resulted in a decrease in elongation and impact properties of the composites.

Investigation of the Fracture of Resinated Single Wood Fibers in an Environmental Scanning Electron Microscope (Esem)

1998 ◽  
Vol 4 (S2) ◽  
pp. 838-839
Author(s):  
A. Egan ◽  
S. Shaler
Keyword(s):  
Mechanical Properties ◽  
Polymer Composite ◽  
Laser Scanning ◽  
Medium Density Fiberboard ◽  
Wood Fiber ◽  
Image Correlation ◽  
Environmental Scanning ◽  
Wood Fibers ◽  
Wood Polymer ◽  
Scanning Electron

Single fiber fracture is important in understanding the fundamental failure mechanisms in wood/polymer composite products such as medium density fiberboard (MDF). The mechanical properties and fracture behavior of individual wood fibers has only recently been observable using a combination of environmental scanning electron microscopy (ESEM), laser scanning confocal microscopy and digital image correlation (DIC). Previous work has shown that specific areas on the fiber such as microcompressions and pits acted as crack nucelators and induce a brash fracture across the surface of the fiber. Given the development of these procedures it is now possible to observe and measure the mechanical properties and fracture characteristics of the wood fiber/ polymer composite fibers.Individual black spruce wood fibers were coated with diphenylmethane 4-4'diisocyanate resin containing Hostasol Red GG. The addition of the Hostasol Red flurochrome provided the option of quantifying resin coverage by fluorescence microscopy.

scholarly journals A novel DOPO-g-KH550 modification wood fibers and its effects on the properties of composite phenolic foams

2018 ◽  
Vol 20 (2) ◽  
pp. 47-53 ◽  
Author(s):  
Yufeng Ma ◽  
Xiang Geng ◽  
Xi Zhang ◽  
Chunpeng Wang ◽  
Fuxiang Chu
Keyword(s):  
Mechanical Properties ◽  
Phenolic Resin ◽  
Wood Fiber ◽  
Treated Wood ◽  
Comprehensive Analysis ◽  
Wood Fibers ◽  
H Nmr ◽  
Interfacial Compatibility ◽  
Ft Ir ◽  
Diffraction Peaks

Abstract A novel 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) graft γ-amino propyl triethoxy silane (KH550) was synthesized and introduced on the surface of wood fiber. Finally DOPO-g-KH550 treated wood fiber (DKTWF) was used to prepare DKTWF composite phenolic foams (DKTWFCPF). The structures of DOPO-g- KH550 was acknowledged by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (1H-NMR). The structures of DKTWF were confirmed by FT-IR. Compared with wood fiber, the diffraction peaks’ position was basically unchanged, but the crystallinity was slightly increased and thermal stability were dramatically improved, T5% and Tmax increased by 21.9o and 36.1o respectively. But the char yield (800o) was slightly reduced. With the dosage of DKWF, there were different degrees of improvement including the mechanical properties, flame retardancy and microstructure of DKTWFCPF. Comprehensive analysis, the interfacial compatibility was significantly improved between DKTWF and phenolic resin, and the suitable content of DKTWF was 4%.

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.

scholarly journals Effect of Wood-Fiber Geometry Size on Mechanical Properties of Wood-Fiber from Neolamarckia Cadamba Species Reinforced Polypropylene Composites

2021 ◽  
Vol 1 (1) ◽  
pp. 42-50
Author(s):  
Mohd Sukhairi Mat Rasat ◽  
Razak Wahab ◽  
Amran Shafie ◽  
Ahmad Mohd Yunus AG. ◽  
Mahani Yusoff ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Wood Species ◽  
Renewable Resources ◽  
Wood Fiber ◽  
Wood Particle ◽  
Thermoplastic Composites ◽  
Polypropylene Composites ◽  
Natural Wood ◽  
Particle Geometry

Using natural wood-fiber as reinforcement in commercial thermoplastics is gaining momentum due to its high specific properties and renewable resources. In this study, the effect of wood particle geometry size on mechanical properties of thermoplastics composite was investigated. The wood species that has been chosen is Kelempayan species (Neolamarckia cadamba) and reinforced with polypropylene using fiber geometry size of 75 and 250 ?m. Thermoplastic composites were produced from two types of ratio (30:70 and 10:90) between wood-fiber and polypropylene. Static bending and tensile strength were tested. The result showed that wood-fiber from 75 ?m geometry sizes with ratio of 30:70 between wood-fiber and polypropylene was most suitable in producing thermoplastic composites. The geometry sizes of wood particle as well as the ratio between wood-fiber and polypropylene were found to influence the mechanical properties of the thermoplastic composites.

Effect of a Novel Coupling Agent, Polybutadiene Isocyanate, on Mechanical Properties of Wood-Fiber Polypropylene Composites

2008 ◽  
Vol 27 (16-17) ◽  
pp. 1679-1687 ◽  
Author(s):  
Amir Nourbakhsh ◽  
Bouhuslav V. Kokta ◽  
Alireza Ashori ◽  
Ahmad Jahan-Latibari
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Wood Fiber ◽  
Polypropylene Composites
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