scholarly journals Properties of core-half wrapped shell structure wood-polymer composites containing glass fiber-reinforced shells

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9088-9102
Author(s):  
Runzhou Huang ◽  
Xian Zhang ◽  
Zhuangzhuang Teng ◽  
Fei Yao
Keyword(s):  
Thermal Expansion ◽  
Glass Fiber ◽  
Polymer Composites ◽  
Mechanical Performance ◽  
Impact Resistance ◽  
Shell Layer ◽  
Flame Resistance ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
The Impact

Glass fiber (GF) is commonly applied as a filler in the preparation of polymer composites. Due to the presence of GF, composite mechanical performance, flame resistance, and thermal performance could be greatly improved. The influence of a GF-filled polymer shell layer was investigated relative to the morphology, mechanical, thermal, and fire flammability performance of the core-half wrapped shell structured wood high-density polyethylene (HDPE) composites prepared via co-extrusion. The use of the relatively less-stiff pure HDPE with high linear coefficients of thermal expansion (LCTEs) lowered the general thermal stability and modulus of the wood polymer composites (WPCs). Flexural and thermal expansion properties were improved for the GF-filled HDPE shells in comparison to the unmodified material, enabling a well-balanced performance of this novel core–shell material. Implementation of GF-modified HDPE or unmodified HDPE layers as a shell for WPC core remarkably improved the impact resistance of the co-extruded WPCs. In comparison with composites possessing unmodified HDPE shell, the flame resistance performance of the shell layer was slightly improved in case that the GF content was below 25 wt%. A slight decrease in composite general heat release and rate was discovered in case that the GF content was greater than 25 wt%.

scholarly journals Rotational Molding of Linear Low-Density Polyethylene Composites Filled with Wheat Bran

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1004 ◽  
Author(s):  
Aleksander Hejna ◽  
Mateusz Barczewski ◽  
Jacek Andrzejewski ◽  
Paulina Kosmela ◽  
Adam Piasecki ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Wheat Bran ◽  
Mechanical Performance ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Rotational Molding ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
The Impact

Application of lignocellulosic fillers in the manufacturing of wood polymer composites (WPCs) is a very popular trend of research, however it is still rarely observed in the case of rotational molding. The present study aimed to analyze the impact of wheat bran content (from 2.5 wt.% to 20 wt.%) on the performance of rotationally-molded composites based on a linear low-density polyethylene (LLDPE) matrix. Microscopic structure (scanning electron microscopy), as well as physico-mechanical (density, porosity, tensile performance, hardness, rebound resilience, dynamic mechanical analysis), rheological (oscillatory rheometry) and thermo-mechanical (Vicat softening temperature) properties of composites were investigated. Incorporation of 2.5 wt.% and 5 wt.% of wheat bran did not cause significant deterioration of the mechanical performance of the material, despite the presence of ‘pin-holes’ at the surface. Values of tensile strength and rebound resilience were maintained at a very similar level, while hardness was slightly decreased, which was associated with the porosity of the structure. Higher loadings resulted in the deterioration of mechanical performance, which was also expressed by the noticeable rise of the adhesion factor. For lower loadings of filler did not affect the rheological properties. However, composites with 10wt.% and 20 wt.% also showed behavior suitable for rotational molding. The presented results indicate that the manufacturing of thin-walled products based on wood polymer composites via rotational molding should be considered a very interesting direction of research.

scholarly journals The impact of wood fiber surface modification on physical properties of wood-polymer composites

Tehnika ◽  
2016 ◽  
Vol 71 (5) ◽  
pp. 659-662
Author(s):  
Srdjan Perisic ◽  
Milos Petrovic ◽  
Andjelika Bjelajac ◽  
Aleksandar Marinkovic ◽  
Dusica Stojanovic ◽  
...  
Keyword(s):  
Surface Modification ◽  
Physical Properties ◽  
Polymer Composites ◽  
Wood Fiber ◽  
Fiber Surface ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
The Impact

scholarly journals By-Products from Food Industry as a Promising Alternative for the Conventional Fillers for Wood–Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 893
Author(s):  
Aleksander Hejna ◽  
Jerzy Korol ◽  
Paulina Kosmela ◽  
Anton Kuzmin ◽  
Adam Piasecki ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Food Industry ◽  
Wood Flour ◽  
Beech Wood ◽  
Mechanical And Thermal Properties ◽  
Promising Alternative ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
The Impact ◽  
By Products

The present paper describes the application of two types of food-industry by-products, brewers’ spent grain (BSG), and coffee silverskin (ŁK) as promising alternatives for the conventional beech wood flour (WF) for wood–polymer composites. The main goal was to investigate the impact of partial and complete WF substitution by BSG and ŁK on the processing, structure, physicochemical, mechanical, and thermal properties of resulting composites. Such modifications enabled significant enhancement of the melt flowability, which could noticeably increase the processing throughput. Replacement of WF with BSG and ŁK improved the ductility of composites, which affected their strength however. Such an effect was attributed to the differences in chemical composition of fillers, particularly the presence of proteins and lipids, which acted as plasticizers. Composites containing food-industry by-products were also characterized by the lower thermal stability compared to conventional WF. Nevertheless, the onset of decomposition exceeding 215 °C guarantees a safe processing window for polyethylene-based materials.

Water Absorption of Wood-Polymer Composites Based on PVC with Partial Replacement of Wood Filler by Mineral One

2019 ◽  
Vol 770 (5) ◽  
pp. 62-66
Author(s):  
A.A. ASKADSKII ◽  
◽  
T.A. MATSEEVICH ◽  
V.I. KONDRASHCHENKO ◽  
◽  
...  
Keyword(s):  
Water Absorption ◽  
Polymer Composites ◽  
Partial Replacement ◽  
Wood Polymer ◽  
Wood Polymer Composites

scholarly journals Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 622
Author(s):  
Krzysztof Wilczyński ◽  
Kamila Buziak ◽  
Adrian Lewandowski ◽  
Andrzej Nastaj ◽  
Krzysztof J. Wilczyński
Keyword(s):  
Polymer Composites ◽  
Process Modeling ◽  
Slip Flow ◽  
Extrusion Process ◽  
Process Conditions ◽  
Rheological Models ◽  
Wood Polymer ◽  
Slip Effects ◽  
Process Simulations ◽  
Wood Polymer Composites

Wood polymer composites are materials with pseudoplastic and viscoelastic properties. They have yield stress and exhibit slip during flow. Studies on extrusion and rheology, as well as on process modeling of these highly filled materials are limited. Extensive rheological and extrusion modeling studies on the wood polymer composite based on the polypropylene matrix were performed. Viscous and slip flow properties were determined (with Rabinowitsch, Bagley, and Mooney corrections) at broad (extrusion) range of shear rate and temperature, using a high-pressure capillary rheometer. Rheological models of Klein and power-law were used for flow modeling, and Navier model was applied for slip modeling. A novel global computer model of WPC extrusion with slip effects has been developed, and process simulations were performed to compute the extrusion parameters (throughput, power consumption, pressure, temperature, etc.), and to study the effect of the material rheological characteristics on the process flow. Simulations were validated experimentally, and were discussed with respect to both rheological and process modeling aspects. It was concluded that the location of the operating point of extrusion process, which defines the thermo-mechanical process conditions, is fundamentally dependent on the rheological materials characteristics, including slip effects.

scholarly journals Dielectric Properties of Wood-Polymer Composites: Effects of Frequency, Fiber Nature, Proportion, and Chemical Composition

2021 ◽  
Vol 5 (6) ◽  
pp. 141
Author(s):  
Imen Elloumi ◽  
Ahmed Koubaa ◽  
Wassim Kharrat ◽  
Chedly Bradai ◽  
Ahmed Elloumi
Keyword(s):  
Dielectric Properties ◽  
Polymer Composites ◽  
Wide Frequency Range ◽  
Dielectric Constants ◽  
Cellulose Content ◽  
Wood Fibers ◽  
Low Frequencies ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
New Applications

The characterization of the dielectric properties of wood–polymer composites (WPCs) is essential to understand their interaction with electromagnetic fields and evaluate their potential use for new applications. Thus, dielectric spectroscopy monitored the evolution of the dielectric properties of WPCs over a wide frequency range of 1 MHz to 1 GHz. WPCs were prepared using mixtures of different proportions (40%, 50%, and 60%) of wood and bark fibers from various species, high-density polyethylene, and maleated polyethylene (3%) by a two-step process, extrusion and compression molding. Results indicated that wood fibers modify the resistivity of polyethylene at low frequencies but have no effect at microwave frequencies. Increasing the fiber content increases the composites’ dielectric properties. The fibers’ cellulose content explains the variation in the dielectric properties of composites reinforced with fibers from different wood species. Indeed, composites with high cellulose content show higher dielectric constants.

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