Accelerated weathering performance of wood‐plastic composites reinforced with carbon and glass fibre‐woven fabrics

2021 ◽  
Author(s):  
Sefa Durmaz ◽  
Yusuf Ziya Erdil ◽  
Ozlem Ozgenc
Keyword(s):  
Glass Fibre ◽  
Woven Fabrics ◽  
Accelerated Weathering ◽  
Wood Plastic Composites ◽  
Plastic Composites

scholarly journals Accelerated weathering of polyvinyl chloride-based wood-plastic composites: Effect of plant species

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5261-5271
Author(s):  
Ruige Qi ◽  
Chunxia He ◽  
Qiang Jin
Keyword(s):  
Polyvinyl Chloride ◽  
Plant Species ◽  
Color Change ◽  
Accelerated Weathering ◽  
Plant Fibers ◽  
Wood Plastic Composites ◽  
Bonding Performance ◽  
Plastic Composites ◽  
The Impact ◽  
Selection Of

The effect of plant species on the accelerated weathering behaviors of polyvinyl chloride-based wood-plastic composites (WPCs) was studied. The selected plant species were eucalyptus, rice husk, and bamboo. The color and chemical compositional changes that occurred due to accelerated weathering were monitored using colorimetry and Fourier transform infrared spectroscopy. The lignin and carbonyl contents of the WPCs were altered with exposure. The color change and lightness of the weathered WPCs increased with exposure time, and the degree of increase depended on the plant species. The water absorption and swelling ratio of the WPCs increased with an increase in exposure. The eucalyptus-based composite was the highest ranked in terms of mechanical properties, and the microstructure of the impact section showed that the interfacial bonding performance deteriorated after exposure. In conclusion, the selection of plant fibers is critical to the service performance of WPCs.

scholarly journals Comparison of the Physico-Mechanical and Weathering Properties of Wood–Plastic Composites Made of Wood Fibers from Discarded Parts of Pomelo Trees and Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2681
Author(s):  
Ke-Chang Hung ◽  
Wen-Chao Chang ◽  
Jin-Wei Xu ◽  
Tung-Lin Wu ◽  
Jyh-Horng Wu
Keyword(s):  
Color Change ◽  
Flexural Modulus ◽  
Modulus Of Rupture ◽  
National Standard ◽  
Accelerated Weathering ◽  
Wood Fibers ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Initial Stage ◽  
Accelerated Weathering Test

The purpose of this study is to compare the characteristics of wood–plastic composites (WPCs) made of polypropylene (PP) and wood fibers (WFs) from discarded stems, branches, and roots of pomelo trees. The results show that the WPCs made of 30–60 mesh WFs from stems have better physical, flexural, and tensile properties than other WPCs. However, the flexural strengths of all WPCs are not only comparable to those of commercial wood–PP composites but also meet the strength requirements of the Chinese National Standard for exterior WPCs. In addition, the color change of WPCs that contained branch WFs was lower than that of WPCs that contained stem or root WFs during the initial stage of the accelerated weathering test, but the surface color parameters of all WPCs were very similar after 500 h of xenon arc accelerated weathering. Scanning electron microscope (SEM) micrographs showed many cracks on the surfaces of WPCs after accelerated weathering for 500 h, but their flexural modulus of rupture (MOR) and modulus of elasticity (MOE) values did not differ significantly during weathering. Thus, all the discarded parts of pomelo trees can be used to manufacture WPCs, and there were no significant differences in their weathering properties during 500 h of xenon arc accelerated weathering.

Determination and Comparison of Material Properties of Commercial Wood-Plastic Composite Products

2014 ◽  
Vol 1051 ◽  
pp. 242-249
Author(s):  
Marko Hyvärinen ◽  
Juho Paajanen ◽  
Timo Kärki
Keyword(s):  
Impact Strength ◽  
Water Absorption ◽  
Material Properties ◽  
Accelerated Weathering ◽  
Wood Plastic Composite ◽  
Thickness Swelling ◽  
Wood Plastic Composites ◽  
Artificial Weathering ◽  
Plastic Composite ◽  
Plastic Composites

Outdoor applications of wood-plastic composites (WPCs) have raised question about the durability of such materials. WPCs are vulnerable to weathering factors such as UV radiation, moisture and freeze-thaw action. Weathering can cause discoloration, chalking, dimensional changes and loss of mechanical properties.This comparative study examines the effects of increased moisture content and artificial weathering on the properties of wood-plastic composites. Five commercial wood-plastic composite products from five different manufacturers were chosen and their water absorption, thickness swelling, impact strength and resistance to artificial weathering analyzed. An in-house manufactured wood-polypropylene composite with carbon black pigment was used as a reference product. In addition to quantitative investigation of material properties, the measured values were also compared with the values ​​reported by the manufacturers.The composite samples were exposed to accelerated weathering in a xenon weathering chamber for 500 hours. The color change was estimated by spectrophotometer method. The weathering resulted in no significant color fading of the composites. After weathering, the general trend was a minor decrease in impact strength. Also the water absorption and thickness swelling of commercial WPC products remained on a low level.

scholarly journals Alien Wood Species as a Resource for Wood-Plastic Composites

2020 ◽  
Vol 11 (1) ◽  
pp. 44
Author(s):  
Sergej Medved ◽  
Daša Krapež Tomec ◽  
Angela Balzano ◽  
Maks Merela
Keyword(s):  
Wood Species ◽  
Dimensional Stability ◽  
Laser Scanning ◽  
Large Scale ◽  
Laser Scanning Microscopy ◽  
Raw Material ◽  
Confocal Laser ◽  
Alien Plant ◽  
Wood Plastic Composites ◽  
Plastic Composites

Since invasive alien species are one of the main causes of biodiversity loss in the region and thus of changes in ecosystem services, it is important to find the best possible solution for their removal from nature and the best practice for their usability. The aim of the study was to investigate their properties as components of wood-plastic composites and to investigate the properties of the wood-plastic composites produced. The overall objective was to test the potential of available alien plant species as raw material for the manufacture of products. This would contribute to sustainability and give them a better chance of ending their life cycle. One of the possible solutions on a large scale is to use alien wood species for the production of wood plastic composites (WPC). Five invasive alien hardwood species have been used in combination with polyethylene powder (PE) and maleic anhydride grafted polyethylene (MAPE) to produce various flat pressed WPC boards. Microstructural analyses (confocal laser scanning microscopy and scanning electron microscopy) and mechanical tests (flexural strength, tensile strength) were performed. Furthermore, measurements of density, thickness swelling, water absorption and dimensional stability during heating and cooling were carried out. Comparisons were made between the properties of six WPC boards (five alien wood species and mixed boards). The results showed that the differences between different invasive alien wood species were less obvious in mechanical properties, while the differences in sorption properties and dimensional stability were more significant. The analyses of the WPC structure showed a good penetration of the polymer into the lumens of the wood cells and a fine internal structure without voids. These are crucial conditions to obtain a good, mechanically strong and water-resistant material.

scholarly journals Testing and Assessing Method for the Resistance of Wood-Plastic Composites to the Action of Destroying Fungi

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 697
Author(s):  
Anna Wiejak ◽  
Barbara Francke
Keyword(s):  
Bending Strength ◽  
Test Results ◽  
Negative Effects ◽  
Destructive Effect ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Wood Polymer ◽  
Proposed Modification ◽  
Assessing Method ◽  
Biological Corrosion

Durability tests against fungi action for wood-plastic composites are carried out in accordance with European standard ENV 12038, but the authors of the manuscript try to prove that the assessment of the results done according to these methods is imprecise and suffers from a significant error. Fungi exposure is always accompanied by high humidity, so the result of tests made by such method is always burdened with the influence of moisture, which can lead to a wrong assessment of the negative effects of action fungus itself. The manuscript has shown a modification of such a method that separates the destructive effect of fungi from moisture accompanying the test’s destructive effect. The functional properties selected to prove the proposed modification are changes in the mass and bending strength after subsequent environmental exposure. It was found that intensive action of moisture measured in the culture chamber of about (70 ± 5)%, i.e., for 16 weeks, at (22 ± 2) °C, which was the fungi culture, which was accompanying period, led to changes in the mass of the wood-plastic composites, amounting to 50% of the final result of the fungi resistance test, and changes in the bending strength amounting to 30–46% of the final test result. As a result of the research, the correction for assessing the durability of wood-polymer composites to biological corrosion has been proposed. The laboratory tests were compared with the products’ test results following three years of exposure to the natural environment.

scholarly journals Rheological Properties of Wood–Plastic Composites by 3D Numerical Simulations: Different Components

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 417
Author(s):  
Xingcong Lv ◽  
Xiaolong Hao ◽  
Rongxian Ou ◽  
Tao Liu ◽  
Chuigen Guo ◽  
...  
Keyword(s):  
Flow Field ◽  
Rheological Properties ◽  
Wood Fiber ◽  
Velocity Shear ◽  
Wood Plastic Composites ◽  
Shear Rates ◽  
Plastic Composites ◽  
Power Law Fluids ◽  
Field Information ◽  
Computational Fluid Dynamics Cfd

The rheological properties of wood–plastic composites (WPCs) with different wood fiber contents were investigated using a rotational rheometer under low shear rates. The flow field information was analyzed and simulated by Ansys Polyflow software. The results showed that the WPCs with different wood fiber contents behaved as typical power-law fluids. A higher wood fiber content increased the shear thinning ability and pseudoplasticity of the WPCs. The pressure, velocity, shear rate, and viscosity distributions of the WPC during extrusion could be predicted by computational fluid dynamics (CFD) Ansys Polyflow software to explore the effects of different components on the flow field of WPCs.

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