Investigation on the uniformity of high‐density polyethylene/wood fiber composites in a twin‐screw extruder

Zhang, Jingjing; Park, Chul; Rizvi, Ghaus; Huang, Hanxiong; Guo, Qingping

doi:10.1002/app.29991

Cited by 27 publications

(26 citation statements)

References 19 publications

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“…Therefore, in this work, melt mixing approach using intermeshing co-rotating twin-screws was used to effectively mix the short natural fibers with the PP matrix. Fully intermeshed twin-screws provide narrow residence time distribution and hence supply uniform heat to the majority of the natural fibers, thus reducing degradation [31]. Co-rotating screws are effective in altering the direction of applied stresses through the usage of different mixing elements, thus producing different shear mixing effects.…”

Section: Twin-screw Extruder Compoundingmentioning

confidence: 99%

Fiber dispersion during compounding/injection molding of PP/kenaf composites: Flammability and mechanical properties

2015

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Section: Twin-screw Extruder Compoundingmentioning

confidence: 99%

Fiber dispersion during compounding/injection molding of PP/kenaf composites: Flammability and mechanical properties

2015

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“…However, the cellulose fiber loading reduces the molecular mobility of matrix which reduces the energy absorption on impact, causing a reduction in composite impact strength with higher cellulose fiber content [12]. The screw speed is one of the important parameters that influence the mixing ability [8] between matrix and reinforcement in a composite material. Three screw speeds (200, 400 and 600 rpm) were used to study the effects of screw speeds on the dispersion of cellulose fibers.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The reason is that the increase of screw speed also increases the shear heating, resulting in higher melt temperatures [8]. As cellulose fibers and polystyrene are temperature-sensitive materials, both materials may have degraded due to the higher temperatures generated when the screw speed increased to 600 rpm.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Bengtsson et al evaluated highly filled cellulose/polypropylene composites, and they reported an increase of stiffness by adding fibers to the composites but a decrease on impact strength [3]. Zhang et al investigated the effect of screw configuration, screw speed and different material compositions in order to achieve a uniformity improvement of wood/HDPE composites [8]. The results showed that the screw speed should be controlled to achieve efficient mixing without thermal degradation [8].…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al investigated the effect of screw configuration, screw speed and different material compositions in order to achieve a uniformity improvement of wood/HDPE composites [8]. The results showed that the screw speed should be controlled to achieve efficient mixing without thermal degradation [8].…”

Section: Introductionmentioning

confidence: 99%

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Polystyrene cellulose fiber composites: effect of the processing conditions on mechanical and dynamic mechanical properties

Poletto¹

2016

Matéria (Rio J.)

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The usage of natural fibers on the composites development has grown rapidly in the recent years due to the fibers plentiful availability, renewable source, low density and biodegradability. However, there are some drawbacks, for instance, the fiber dispersion on a polyolefin matrix. In this work, the influence of processing speed on the mechanical and dynamic mechanical properties of polystyrene (PS) filled with cellulose fiber composites was investigated. The composites were processed on a twin-screw co-rotating extruder, using screw speeds of 200 rpm, 400 rpm and 600 rpm. The dynamic mechanical properties and the mechanical properties were investigated as a function of fiber content. The composites processed on a screw speed of 400 rpm had presented an increase on flexural and impact strength, compared to the composites processed at 200 rpm. The flexural and storage modulus had increased when increasing the fiber content, as well as increasing the processing speed. The greater fiber dispersion obtained at a screw speed of 400 rpm hinders the agglomeration arrangement and distributes the fibers more equally on the matrix. The increase on processing speed probably generates a fiber size reduction, increasing the fiber superficial area and generating a greater contact with the matrix as well. Therefore, the efforts transference of matrix to fibers is improved, originating an increase on the evaluated properties.

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Lignocellulosic fiber reinforced composites: Influence of compounding conditions on defibrization and mechanical properties

Beaugrand

Berzin

2012

J of Applied Polymer Sci

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This work describes a systematic study of the compounding conditions by twin-screw extrusion on the defibrization process that modulates the fiber aspect ratio and in turn the mechanical properties. Composites made of polycaprolactone reinforced by 20% hemp fibers were prepared by melt blending. The influence of the extrusion parameters (screw speed, feed rate, barrel temperature, and screw profile) and the initial fiber moisture content on both the fiber dimensions and the mechanical performance of the composite was investigated. The fiber aspect ratio increased when the fibers were water plasticized, principally at a higher feed rate and under a moderated extrusion temperature. The screw speed slightly influenced the fiber dimensions. Flow modeling was used to estimate the specific mechanical energy provided to the fibers, which ranged from 300 to 1700 kWh/t. Independent of the screw profile, a decrease in fiber length with an increase in energy was observed. The evolution of the fiber length and aspect ratios with respect to energy can be accurately described by an exponential function.The defibrization process concomitantly results in decohesion and fragmentation phenomena of the fiber elements. When fracture occurs in the interfiber cement (i.e., by degumming of the middle lamella connecting fibers), the process is called decohesion. Fragmentation occurs when the intrafiber structure integrity, i.e., the cell wall, is damaged. Defibrization is therefore related to fracture, and initiation sites and propagation pathways can be influenced by intrinsic parameters related to the quality of the fibers as well as by external factors (e.g., machining, 9 stress mode, 10,11 etc.)At the molecular level, some factors that influence the viscoelastic properties, such as the water (moisture) content and

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Investigation on the uniformity of high‐density polyethylene/wood fiber composites in a twin‐screw extruder

Cited by 27 publications

References 19 publications

Fiber dispersion during compounding/injection molding of PP/kenaf composites: Flammability and mechanical properties

Fiber dispersion during compounding/injection molding of PP/kenaf composites: Flammability and mechanical properties

Polystyrene cellulose fiber composites: effect of the processing conditions on mechanical and dynamic mechanical properties

Lignocellulosic fiber reinforced composites: Influence of compounding conditions on defibrization and mechanical properties

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