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

Beaugrand, Johnny; Berzin, Françoise

doi:10.1002/app.38468

Cited by 86 publications

(85 citation statements)

References 38 publications

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“…Despite these differences in length and diameter, in all cases, the fibre aspect ratio distributions in these compounds were found to be close to each other. These results went in the same way than Beaugrand and Berzin (2012) observations in PCL/hemp compounding by twin-screw extrusion, which enlightened also a small screw speed influence on fibre size. Length and diameter for bamboo fibres in the final material are presented in Table 4.…”

Section: Fibre Sizesupporting

confidence: 77%

“…Modifying residence time of both fibre and PLA or providing more shear did not help improving the mixing between both components, as tensile strength remained quite the same for all the compounds tested. Beaugrand and Berzin (2012) also observed a small influence of screw speed on PCL/hemp composite mechanical properties. Contrarily to the observations in Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 80%

“…Indeed, distributions, after fibre addition in Bionolle ® with low melt viscosity, were wider with long fibres than distributions for TPS or Biocell ® biocomposites. By increasing the fibre content in TPS from 10 to 20%, they showed considerable increase of the fibre percentage in the lower length fraction under 200 m. Beaugrand and Berzin (2012) correlated hemp fibre length reduction to the increasing specific mechanical energy (SME) spent during compounding by twin-screw extrusion in polycaprolactone (PCL) matrix. The couple barrel temperature and fibre moisture content was also found to have an importance.…”

Section: Introductionmentioning

confidence: 92%

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Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Gamon

Evon

Rigal

2013

Industrial Crops and Products

117

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. b s t r a c tNatural fibres from miscanthus and bamboo were added to poly(lactic acid) by twin-screw extrusion. The influence of extruder screw speed and of total feeding rate was studied first on fibre morphology and then on mechanical and thermal properties of injected biocomposites. Increasing the screw speed from 100 to 300 rpm such as increasing the feeding rate in the same time up to 40 kg/h helped to preserve fibre length. Indeed, if shear rate was increased with higher screw speeds, residence time in the extruder and blend viscosity were reduced. However, such conditions doubled electrical energy spent by produced matter weight without significant effect on material properties. The comparison of four bamboo grades with various fibre sizes enlightened that fibre breakages were more consequent when longer fibres were added in the extruder. Longer fibres were beneficial for material mechanical properties by increasing flexural strength, while short fibres restrained material deformation under heat by promoting crystallinity and hindering more chain mobility.

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Section: Fibre Sizesupporting

confidence: 77%

Section: Mechanical Propertiesmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Gamon

Evon

Rigal

2013

Industrial Crops and Products

117

View full text Add to dashboard Cite

show abstract

“…Depending on their chemical composition, elementary fibre cells and mechanical strength, natural fibres present more or less extensive breaking and disaggregation during processing. Beaugrand and Berzin have shown that the aspect ratio of hemp fibres in a polycaprolactone (PCL) matrix increases when plasticised in water [14]. Le Moigne et al [15] investigated the length and aspect ratio of flax, sisal and wheat straw extracted from their PP based composites after injection moulding.…”

Section: Introductionmentioning

confidence: 99%

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

Graupner

Albrecht²,

Ziegmann³

et al. 2016

Express Polym. Lett.

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Abstract. The present study focuses on the reprocessing behaviour of recycled injection moulded polylactide (PLA) composites. The composites are reinforced with regenerated cellulose fibres (lyocell) of variable fineness and a fibre mass content of 30%. They were reprocessed up to three times. The influence of reprocessing on the fibre length distribution and the resulting composite mechanical properties (tensile and impact strength) was analysed. While the first reprocessing cycle does not affect the mechanical characteristics of the neat PLA matrix, the strength of the composites decreases significantly due to a decreasing fibre aspect ratio. It was shown that fibres having a larger cross-sectional area display a lower aspect ratio than finer fibres, after reprocessing. This phenomenon leads to a larger decrease in tensile strength of composites reinforced with coarser fibres when compared to composites reinforced with finer fibres. A comparison of virgin composites and threefold reprocessed composites with a similar fibre length distribution resulted in a significantly higher tensile strength compared to the virgin sample. This result leads to the conclusion that not only the fibre length is drastically reduced by reprocessing but also that the fibres and the matrix were damaged.

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“…Despite the importance of this process, all too often the extruder is treated as a "black-box"with temperature and screw-speed being the main parameters controlled [Beaugrand and Berzin, 2013, Chevali and Ulven, 2012, Oksman et al, 2003. By neglecting aspects such as the screw configuration, feeding location or feeding strategy, the full potential of the extruder is not exhausted.…”

Section: Compounding Short Fibre Biocompositesmentioning

confidence: 99%

Manufacture and characterisation of short fibre biocomposites

Legras¹

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In response to environmental concerns, the composites industry is showing a growing interest in natural fibre biocomposites as an alternative to wood plastic composites and glass fibre thermoplastics. Albeit many years of research, the potential of these new materials has not being reached and the properties obtained are too often lower than expected. A main reason for this is because the natural fibre properties are variable and poorly characterised, and inefficient traceability makes it difficult to grade the fibres. When it comes to biocomposite manufacturing, short plant fibre composites have attracted the interest of the thermoplastic compounding industry but only a few companies have mastered the compounding step. Too often, the extruder is treated as a "black box" and the critical processing parameters have not yet been identified. As a result, the full potential of extrusion process for biocomposites is not exhausted. In addition, the critical parameters to determine the BET surface area values with IGC were identified and a protocol applicable to natural fibres was proposed.The series of extrusion trials brought new insights into the feasibility of large scale biocomposite extrusion. Statistical analysis showed a significant interdependence between all factors and particularly between the screw speed and the screw design. At both laboratory scale and i medium scale, fibre content was the dominant factor for the tensile strength and elastic modulus whilst screw speed and screw design affected to a lower degree the tensile properties. The fibre surface properties and fibre length distribution were also determinant for the biocomposite properties. For instance, the alkaline treated fibre reinforced polypropylene composites underperformed compared to the water washed fibre polypropylene composites although the former had a surface more energetically homogeneous and less polar. It is assumed that the higher fibre aspect ratio of the water washed fibres and their homogeneous fibre length distribution largely contributed to increase the composite performance.Finally, extrusion at industrial scale has been successfully performed and represents a major achievement of the thesis. However, significant amount of porosity was noticed in the extruded samples throughout the trials and further work is required to overcome this issue. Whilst the porosity detected in the samples questions the industrial-usefulness of some of the results, the contribution of this thesis to the development of natural fibre compounding capability at The University of Queensland and collaborating local industries was immense. The methodology and the lessons learned will undoubtedly be used to further optimise the extrusion process and produce better biocomposite materials.ii

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

Cited by 86 publications

References 38 publications

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

Manufacture and characterisation of short fibre biocomposites

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