Use of Grafted Wood Fibers in Thermoplastic Composites V. Polystyrene

In this article, a comparative study was carried out on two types of thermosetting and thermoplastic matrices to study the effect of the fiber-matrix interface damage on the behavior of thermosetting and thermoplastic composites reinforced by the same natural alfa and wood fibers. The genetic modeling was based on the probabilistic formalism of Weibull. The results have been compared with those obtained by the nonlinear acoustic technique, the two results found to coincide perfectly. The numerical simulation also shows a good concordance with the real behavior of the materials studied, and shows that thermosetting composites are the most resistant to applied thermal stress by 21% compared to thermoplastic composites. Statistical analysis demonstrates that the correlation coefficient values found are very close to 1 (0.964 and 0.973), these values are very satisfactory, and confirm that the results obtained by the genetic model and the nonlinear acoustic technique are in very good agreement with the statistical analysis data. The experimental work presented by Antoine Le Duigou et al. and the work of Bodros et al. have shown that the use of natural fibers greatly improves the mechanical properties of composite materials.

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Use of Wood Fibers in Thermoplastic Composites III. Polymethyl methacrylate

Polymer Composites ◽

10.1515/9783110856934-021 ◽

1986 ◽

pp. 251-268 ◽

Cited By ~ 2

Author(s):

C. Daneault ◽

A.D. Beshay ◽

P.D. Kamdem ◽

B.V. Kokta

Keyword(s):

Polymethyl Methacrylate ◽

Thermoplastic Composites ◽

Wood Fibers

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A Branched Polyelectrolyte Complex Enables Efficient Flame Retardant and Excellent Robustness for Wood/Polymer Composites

Polymers ◽

10.3390/polym12112438 ◽

2020 ◽

Vol 12 (11) ◽

pp. 2438

Author(s):

Yanping Huang ◽

Shuai Zhang ◽

He Chen ◽

Chunxiang Ding ◽

Yan Xuan ◽

...

Keyword(s):

Flame Retardant ◽

Polymer Composites ◽

Polyelectrolyte Complex ◽

Electrical Equipment ◽

Interfacial Bonding ◽

Thermoplastic Composites ◽

Wood Fibers ◽

Bonding Performance ◽

Fiber Reinforced Polymer Composites ◽

Wood Polymer

Wood/thermoplastic composites (WPCs) have been restricted in some fields of building construction and electrical equipment because of their inherent high flammability and lower toughness. In this work, a branched crosslinking network polyelectrolyte complex (PEC) has been designed by incorporation of polyethyleneimine (PEI), a cation polyelectrolyte end capped amine groups, into cellulose nanocrystals (CNC), and ammonium polyphosphate (APP) via self-assembling. The hydrogen bonding interactions, penetration, and mechanical interlock provided by PEC effectively enhance the interfacial bonding within matrix, wood fibers, and flame retardant. Interestingly, it generates abundant micropores on the inner structure of WPC. The excellent interfacial bonding performance and easy-to-move molecular chain successfully transfer the stress and induce energy dissipation, simultaneously giving rise to higher strength and toughness for WPC. As well as the PEC endows WPC with a promotion in both smoke suppression and UL-94 V-0 rate. Additionally, the peak heat release rate and total smoke release for WPC obviously reduce by 36.9% and 50.0% respectively in presence of 25% PEC. A simple, eco-friendly, and concise strategy exhibits prospects for fiber-reinforced polymer composites with effective flame retardancy and mechanical robust properties.

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The Effect of Recycling on Wood-Fiber Thermoplastic Composites

Polymers ◽

10.3390/polym12081750 ◽

2020 ◽

Vol 12 (8) ◽

pp. 1750

Author(s):

Luísa Rosenstock Völtz ◽

Irangeli Di Guiseppe ◽

Shiyu Geng ◽

Kristiina Oksman

Keyword(s):

Fiber Length ◽

Interfacial Adhesion ◽

Processing Time ◽

Wood Fiber ◽

Extrusion Process ◽

Thermoplastic Composites ◽

Wood Fibers ◽

Screw Extruder ◽

Twin Screw ◽

Number Of Passes

The aim of this study was to investigate the effect of recycling on polypropylene (PP) and wood-fiber thermoplastic composites (WPCs) using a co-rotating twin-screw extruder. After nine extrusion passes microscopy studies confirmed that the fiber length decreased with the increased number of recycling passes but the increased processing time also resulted in excellent dispersion and interfacial adhesion of the wood fibers in the PP matrix. Thermal, rheological, and mechanical properties were studied. The repeated extrusion passes had minimal effect on thermal behavior and the viscosity decreased with an increased number of passes, indicating slight degradation. The recycling processes had an effect on the tensile strength of WPCs while the effect was minor on the PP. However, even after the nine recycling passes the strength of WPC was considerably better (37 MPa) compared to PP (28 MPa). The good degree of property retention after recycling makes this recycling strategy a viable alternative to discarding the materials. Thus, it has been demonstrated that, by following the most commonly used extrusion process, WPCs can be recycled several times and this methodology can be industrially adapted for the manufacturing of recycled products.

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Use of wood fibers in thermoplastic composites

Polymer Composites ◽

10.1002/pc.750040407 ◽

1983 ◽

Vol 4 (4) ◽

pp. 229-232 ◽

Cited By ~ 62

Author(s):

Bohuslav V. Kokta ◽

Rubie Chen ◽

Claude Daneault ◽

Jacques L. Valade

Keyword(s):

Thermoplastic Composites ◽

Wood Fibers

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Application of Solubility Parameters to Lignocellulosic/Thermoplastic Composites

MRS Proceedings ◽

10.1557/proc-266-155 ◽

1992 ◽

Vol 266 ◽

Author(s):

Don H. White ◽

S. C. Park

Keyword(s):

Physical Properties ◽

Polymer Blends ◽

Wood Fiber ◽

Thermoplastic Composites ◽

Solubility Parameters ◽

Current Interest ◽

Wood Fibers ◽

Good Adhesion ◽

Miscible Polymer Blends ◽

Miscible Blends

AbstractThe usefulness of solubility parameters in identifying miscible polymer blends is reviewed. The use of wood fibers in mixtures of recycled thermoplastics is of current interest. These composites do not require miscible blends of polymers, but must exhibit compatibility in order to have good adhesion and physical properties. The use of solubility parameters to design improved composites is cited. This approach is then applied to wood fiber/polyolefin thermoplastic composites.

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Insight into the Surface Properties of Wood Fiber-Polymer Composites

Polymers ◽

10.3390/polym13101535 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1535

Author(s):

Klementina Pušnik Črešnar ◽

Marko Bek ◽

Thomas Luxbacher ◽

Mihael Brunčko ◽

Lidija Fras Zemljič

Keyword(s):

Polymer Composites ◽

Surface Properties ◽

Wood Fiber ◽

Antioxidant Properties ◽

Skin Layer ◽

Filler Loading ◽

Attenuated Total Reflection ◽

Thermoplastic Composites ◽

Wood Fibers ◽

Pp Composites

The surface properties of wood fiber (WF) filled polymer composites depend on the filler loading and are closely related to the distribution and orientation in the polymer matrix. In this study, wood fibers (WF) were incorporated into thermoplastic composites based on non-recycled polypropylene (PP) and recycled (R-PP) composites by melt compounding and injection moulding. ATR-FTIR (attenuated total reflection Fourier transform infrared spectroscopy) measurements clearly showed the propagation of WF functional groups at the surface layer of WF-PP/WF-R-PP composites preferentially with WF loading up to 30%. Optical microscopy and nanoindentation method confirmed the alignment of thinner skin layer of WF-PP/WF-R-PP composites with increasing WF addition. The thickness of the skin layer was mainly influenced by the WF loading. The effect of the addition of WF on modulus and hardness, at least at 30 and 40 wt.%, varies for PP and R-PP matrix. On the other hand, surface zeta potential measurements show increased hydrophilicity with increasing amounts of WF. Moreover, WF in PP/R-PP matrix is also responsible for the antioxidant properties of these composites as measured by DPPH (2,2′-diphenyl-1-picrylhydrazyl) assay.

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