Microcellular wood fiber reinforced polymer materials have important applications because of thei... more Microcellular wood fiber reinforced polymer materials have important applications because of their ability to reduce the density of automotive components due to their structure-property advantages. This research investigates the effects of chemical foaming agent content on cell morphology, density, and mechanical (tensile, flexural, and impact) properties of microcellular injection molded wood fiber reinforced polypropylene (PP) composites. The effects of various concentrations (2-5 wt% of the composites) of the exothermic chemical foaming agent on the properties of the composites was studied with a view of establishing the concentration-structure-property relationships for these materials. The results indicate that exothermic 2 wt% content shows finer microcellular structure than other contents, dependent on wood fiber content. Density was reduced with all foaming agent contents, to a maximum of 30%, and decreased up to 0.739 g/cm3 at wood fiber content of 30 wt% with coupling agen...
It is also possible that your web browser is not configured or not able to display style sheets. ... more It is also possible that your web browser is not configured or not able to display style sheets. In this case, although the visual presentation will be degraded, the site should continue to be functional. We recommend using the latest version of Microsoft or Mozilla web browser to ...
ABSTRACT Wood-plastic composites (WPCs) may be one of the most dynamic sectors of the present day... more ABSTRACT Wood-plastic composites (WPCs) may be one of the most dynamic sectors of the present day plastic industry. Although the technology is not new, there is growing interest in the new design possibilities that this marriage of materials offers. The formulation variations of WPCs that increase wood content offer expansion into other uses, and volume processors must produce faster, better, and cheaper materials. On the other hand, weatherability and life cycle costs are the major factors that restrict the expansion of the field of WPCs.This article gives an overview of the recent literature, covering all aspects of WPC materials and their performance as of today. It focuses on their compositions, that is, thermoplastics and thermosets, wood fiber types, and additives. Furthermore, it includes recent progress and improvements in the WPC production area. The processes (compounding, extrusion, injection molding, and compression molding) used for the manufacture of WPC products are described. The properties (mechanical, physical, and biological) of WPC are also covered. This paper proceeds to take the performance and properties of microcellular-foamed WPC and nano-WPC into account. Last, this paper concludes with applications, developments, and future trends of WPCs.Keywords:wood–plastic composites;hardwood fiber;softwood fiber;modification;extrusion;injection molding;compounding;compression molding;tensile properties;flexural properties;impact properties;water absorption;swelling;microcellular foaming;nanocomposites;moisture content;fungal
Wood‐fiber‐reinforced plastic profiles are growing rapidly in nonstructural wood‐replacement appl... more Wood‐fiber‐reinforced plastic profiles are growing rapidly in nonstructural wood‐replacement applications. Most manufacturers are evaluating new alternative foamed composites, which are lighter and more like wood. Foamed wood composites accept screws and nails better than their nonfoamed counterparts, and they have other advantages as well. For example, internal pressures created by foaming give better surface definition and sharper contours and corners than nonfoamed profiles have. In this study, the microfoaming of polypropylene (PP) containing hardwood fiber was performed with an injection‐molding process. The effects of different chemical foaming agents (endothermic, exothermic, and endothermic/exothermic), injection parameters (the mold temperature, front flow speed, and filling quantity), and different types of PP (different melt‐flow indices) on the density, microvoid content, physicomechanical properties, surface roughness, and microcell classification of microfoamed PP/wood...
Natural and wood fibre reinforced plastics as a relatively new group of environmental friendly ma... more Natural and wood fibre reinforced plastics as a relatively new group of environmental friendly materials have been extensively applied in interior, building applications and in the automobile industry. Among others, natural and wood fibre reinforced foamed polymer materials are of high significance because of the possibility of their reducing the density of automotive components which have a cellular structure. However,
Wood fibre reinforced polypropylene composites of different fibre content (40, 50 and 60% by weig... more Wood fibre reinforced polypropylene composites of different fibre content (40, 50 and 60% by weight) have been prepared and wood fibres (hard and long fibre) were treated with compatibiliser (MAH-PP) to increase the interfacial adhesion with the matrix to improve the dispersion of ...
Microcellular wood fiber reinforced polymer materials have important applications because of thei... more Microcellular wood fiber reinforced polymer materials have important applications because of their ability to reduce the density of automotive components due to their structure-property advantages. This research investigates the effects of chemical foaming agent content on cell morphology, density, and mechanical (tensile, flexural, and impact) properties of microcellular injection molded wood fiber reinforced polypropylene (PP) composites. The effects of various concentrations (2-5 wt% of the composites) of the exothermic chemical foaming agent on the properties of the composites was studied with a view of establishing the concentration-structure-property relationships for these materials. The results indicate that exothermic 2 wt% content shows finer microcellular structure than other contents, dependent on wood fiber content. Density was reduced with all foaming agent contents, to a maximum of 30%, and decreased up to 0.739 g/cm3 at wood fiber content of 30 wt% with coupling agen...
It is also possible that your web browser is not configured or not able to display style sheets. ... more It is also possible that your web browser is not configured or not able to display style sheets. In this case, although the visual presentation will be degraded, the site should continue to be functional. We recommend using the latest version of Microsoft or Mozilla web browser to ...
ABSTRACT Wood-plastic composites (WPCs) may be one of the most dynamic sectors of the present day... more ABSTRACT Wood-plastic composites (WPCs) may be one of the most dynamic sectors of the present day plastic industry. Although the technology is not new, there is growing interest in the new design possibilities that this marriage of materials offers. The formulation variations of WPCs that increase wood content offer expansion into other uses, and volume processors must produce faster, better, and cheaper materials. On the other hand, weatherability and life cycle costs are the major factors that restrict the expansion of the field of WPCs.This article gives an overview of the recent literature, covering all aspects of WPC materials and their performance as of today. It focuses on their compositions, that is, thermoplastics and thermosets, wood fiber types, and additives. Furthermore, it includes recent progress and improvements in the WPC production area. The processes (compounding, extrusion, injection molding, and compression molding) used for the manufacture of WPC products are described. The properties (mechanical, physical, and biological) of WPC are also covered. This paper proceeds to take the performance and properties of microcellular-foamed WPC and nano-WPC into account. Last, this paper concludes with applications, developments, and future trends of WPCs.Keywords:wood–plastic composites;hardwood fiber;softwood fiber;modification;extrusion;injection molding;compounding;compression molding;tensile properties;flexural properties;impact properties;water absorption;swelling;microcellular foaming;nanocomposites;moisture content;fungal
Wood‐fiber‐reinforced plastic profiles are growing rapidly in nonstructural wood‐replacement appl... more Wood‐fiber‐reinforced plastic profiles are growing rapidly in nonstructural wood‐replacement applications. Most manufacturers are evaluating new alternative foamed composites, which are lighter and more like wood. Foamed wood composites accept screws and nails better than their nonfoamed counterparts, and they have other advantages as well. For example, internal pressures created by foaming give better surface definition and sharper contours and corners than nonfoamed profiles have. In this study, the microfoaming of polypropylene (PP) containing hardwood fiber was performed with an injection‐molding process. The effects of different chemical foaming agents (endothermic, exothermic, and endothermic/exothermic), injection parameters (the mold temperature, front flow speed, and filling quantity), and different types of PP (different melt‐flow indices) on the density, microvoid content, physicomechanical properties, surface roughness, and microcell classification of microfoamed PP/wood...
Natural and wood fibre reinforced plastics as a relatively new group of environmental friendly ma... more Natural and wood fibre reinforced plastics as a relatively new group of environmental friendly materials have been extensively applied in interior, building applications and in the automobile industry. Among others, natural and wood fibre reinforced foamed polymer materials are of high significance because of the possibility of their reducing the density of automotive components which have a cellular structure. However,
Wood fibre reinforced polypropylene composites of different fibre content (40, 50 and 60% by weig... more Wood fibre reinforced polypropylene composites of different fibre content (40, 50 and 60% by weight) have been prepared and wood fibres (hard and long fibre) were treated with compatibiliser (MAH-PP) to increase the interfacial adhesion with the matrix to improve the dispersion of ...
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