Effects of polymer molecular weight and filler particle size on flow behavior of wood polymer composites

2008 ◽  
Vol 29 (8) ◽  
pp. 831-839 ◽  
Author(s):  
Velichko Hristov ◽  
John Vlachopoulos
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Polymer Composites ◽  
Flow Behavior ◽  
Filler Particle ◽  
Polymer Molecular Weight ◽  
Wood Polymer ◽  
Filler Particle Size ◽  
Wood Polymer Composites

INFLUENCE OF FILLER PARTICLE SIZE ON THE CONDUCTIVITY AND PERMITTIVITY OF METAL-POLYMER COMPOSITES

2019 ◽  
Vol 21 (4) ◽  
pp. 221-228
Author(s):  
F.Т. Boymuratov ◽  
U. Abdurakhmanov ◽  
Sh.M. Sharipov ◽  
G.I. Mukhamedov ◽  
G.Yu. Yurkov
Keyword(s):  
Particle Size ◽  
Percolation Threshold ◽  
Polymer Composites ◽  
Filler Particle ◽  
Additional Contribution ◽  
Dispersed Particles ◽  
Filler Particle Size ◽  
Hierarchy Model ◽  
Network Hierarchy ◽  
Metal Polymer

The behaviour of conductivity σ and permittivity ε of metal-polymer composites comprising Ni particles dispersed in the phenilon are studied. It is found that the percolation-like behaviour of σ and ε, which is observed when the Ni particles have the sizes of 1−3 μm (micro-dispersed particles), gave way to another behaviour characterized by an additional contribution to σ and ε below the percolation threshold when the Ni particles have the sizes of ≤30 nm (nanoparticles). This peculiarity of the behaviour of σ and ε of the composites can be explained in the frame of the network hierarchy model of composites, which was proposed recently by Balberg et al.

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.

scholarly journals Analysis of Creep of Wood-Polymer Composites

2021 ◽  
Vol 1079 (4) ◽  
pp. 042022
Author(s):  
M A Elesin ◽  
N A Mashkin ◽  
V F Khritankov ◽  
N V Karmanovskaya
Keyword(s):  
Polymer Composites ◽  
Wood Polymer ◽  
Wood Polymer Composites
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