Thermoplastic moulding of wood-polymer composites (WPC): a review and research proposal on thermo-physical and geometric design options using hot-pressing

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.

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

Journal of Composites Science ◽

10.3390/jcs5060141 ◽

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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Analysis of Creep of Wood-Polymer Composites

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1079/4/042022 ◽

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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Analysis of wood polymer composites by two-stage pyrolysis–GC/MS

Journal of Analytical and Applied Pyrolysis ◽

10.1016/j.jaap.2008.09.008 ◽

2008 ◽

Vol 83 (2) ◽

pp. 213-219 ◽

Cited By ~ 29

Author(s):

Clemens Schwarzinger ◽

Manuela Leidl ◽

Robert Putz

Keyword(s):

Polymer Composites ◽

Two Stage ◽

Wood Polymer ◽

Wood Polymer Composites

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