Effects of Defibration Conditions on Mechanical and Physical Properties of Wood Fiber/High-Density Polyethylene Composites

Lerche, Henrik; Benthien, Jan T.; Schwarz, Katrin U.; Ohlmeyer, Martin

doi:10.1080/02773813.2013.838269

Cited by 7 publications

(12 citation statements)

References 11 publications

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“…With regard to the values achieved in this study, flexural strength of WF and wood flour composites reported in the literature are higher. For HDPE‐based WF composites (50 wt % fibers) Lerche et al . and Woodhams et al .…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, the utilization of wood fibers instead of wood flour as reinforcement in composites is gaining interest . Wood fibers differ naturally from wood flour, in that wood fibers consist of the entire cell wall of one former living wood cell.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, dissolving fiber agglomerates during compounding is challenging with established technologies such as extruders . To avoid the feed‐in problem, scientific investigations often use laboratory scale batch processes to compound lignocellulosic fibers . Others pelletized the fibers before compounding, resulting in a significant fiber length reduction.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of wood fiber composites based on a novel simultaneous defibration and compounding process

Mertens

Krause

2017

J of Applied Polymer Sci

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The distinctive length and morphology characteristics of thermomechanical produced wood fibers make it a promising candidate for the utilization in polymer composites. However, due to the low bulk density of these fibers, the feeding into the compounding process (i.e., extruders) is quite challenging. In this study, a novel simultaneous defibration and compounding process are conducted in order to solve the feed‐in problem of thermomechanical fibers. A disc‐refiner was used to defibrate wood chips to fibers and compound the fibers with neat polymer granulates in one process step. After the process, the material showed typically thermomechanical fibers with chopped polymer particles which were inseparably attached to the fiber. The observed mechanical properties of the composites were slightly lower than some literature values. With field emission scanning electron microscopy and X‐ray microtomography analysis, voids and a polymer enriched surface were found influencing the composites performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45859.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of wood fiber composites based on a novel simultaneous defibration and compounding process

Mertens

Krause

2017

J of Applied Polymer Sci

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“…In recent years, the interest in the utilization of TMP instead of wood flour has grown due to several advantages. TMP is usually produced for medium density fiber boards (MDF) using a refiner process.…”

Section: Introductionmentioning

confidence: 99%

“…Lignin is less polar than polysaccharides, and therefore, more compatible toward nonpolar polyolefin matrices . The high aspect ratio of TMP fibers has a reinforcing effect on the composite, increasing tensile and flexural strength as well as modulus of elasticity (MOE) . In contrast to TMP, wood flour, with its cubical particle shape, tends to only increase the stiffness of composites, but does not improve their tensile strength .…”

Section: Introductionmentioning

confidence: 99%

The utilization of thermomechanical pulp fibers in WPC: A review

Mertens¹,

Gurr²,

Krause³

2017

J of Applied Polymer Sci

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Thermomechanical pulp (TMP), among other natural fibers, features characteristics that make it a promising candidate for the utilization in polymer composites. This review is providing an overview on the current state of research on TMP reinforced polymer composites. More than 50 references were reviewed. The cited literature is catalogued according to pretreatments, batch or continuous procedures, processing at laboratory or industrial scale, fiber contents, polymer types, coupling agents as well as wood species. The reinforcing potential of TMP utilized in composites is demonstrated. Tensile strength was found to be peaking at a fiber content of around 40 wt %. Fiber morphology is presumed to be an important determinator for composite properties. Specific mechanical energy [kWh/kg] is presented as an indicator suitable to compare the influence of various processes on fiber morphology. Furthermore, the feed-in and dosing issue that generally accompanies the utilization of cellulosic fibers is described and possible solutions are discussed.

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Targeted pre-treatment of hemp bast fibres for optimal performance in biocomposite materials: A review

Liu

Thygesen

Summerscales

et al. 2017

Industrial Crops and Products

160

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Global interest in the use of plant fibres in natural fibre reinforced composites (NFCs) is growing rapidly. The increased interest is primarily due to the advantageous properties of natural fibres including biodegradability, low cost, low density and high stiffness and strength to weight ratio. In order to achieve strong NFCs, well separated and celluloserich fibres are required. Hemp is taking a center stage in this regard as a source of suitable natural plant cellulose fibres because natural hemp bast fibres are long and inherently possess high strength. Classical field and water retting methods have been used for centuries for removal of non-cellulosic components from fibrous plant stems including from hemp, but carries a risk of reducing the mechanical properties of the fibres via damaging the cellulose. For NFCs new targeted fibre pre-treatment methods are needed to selectively and effectively remove non-cellulosic components from the plant fibres and for producing cellulose rich fibres without introducing any damage to the fibres. A key feature for successful use of natural fibres such as hemp fibres in composite materials is optimal interfacial contact between the fibres and the hydrophobic composite matrix material. Targeted modification of natural fibres for NFCs must also be targeted to optimize the fibre surface properties. Consequently, improved interfacial bonding between fibres and hydrophobic polymers, reduced moisture uptake, increased microbial degradation resistance, and prolonged durability of NFCs can be achieved. This review, using hemp bast fibres as an example, critically and comprehensively assesses the targeted pretreatment technologies and data available for producing well separated cellulose bast fibres having optimal chemical and physical properties for maximizing the mechanical performance and durability of NFCs.

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Effects of Defibration Conditions on Mechanical and Physical Properties of Wood Fiber/High-Density Polyethylene Composites

Cited by 7 publications

References 11 publications

Evaluation of wood fiber composites based on a novel simultaneous defibration and compounding process

Evaluation of wood fiber composites based on a novel simultaneous defibration and compounding process

The utilization of thermomechanical pulp fibers in WPC: A review

Targeted pre-treatment of hemp bast fibres for optimal performance in biocomposite materials: A review

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