Journal ArticleDOI
Lignocellulosic fiber breakage in a molten polymer. Part 2. Quantitative analysis of the breakage mechanisms during compounding
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TLDR
In this paper, the changes in the dimensions of four types of fibers (hemp, miscanthus, sisal, flax) under different processing conditions, using an internal mixer to mimic the extrusion process.Abstract:
Composites made of polypropylene and short lignocellulosic fibers are usually produced by compounding in a twin-screw extruder. During processing, fibers are submitted to stress and strain and they undergo severe degradations, i.e. a reduction of both length and diameter, affecting the final properties of the composites. In this paper, which is the second of a series, we have systematically studied the changes in the dimensions of four types of fibers (hemp, miscanthus, sisal, flax) under different processing conditions, using an internal mixer to mimic the extrusion process. We show that the fibers’ length and diameter decrease with the strain cumulated during the process. These changes may be described using exponential laws, the parameters of which differ from one fiber type to another. Based on these evolution laws, we propose to define a “breakage index” to discriminate the behavior of the different types of fibers.read more
Citations
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Lignocellulosic fibers: a critical review of the extrusion process for enhancement of the properties of natural fiber composites
Antoine Gallos,Antoine Gallos,Gabriel Paës,Florent Allais,Florent Allais,Johnny Beaugrand,Johnny Beaugrand +6 more
TL;DR: In this article, a broad panel of composites reinforced with lignocellulosic fibers is reviewed along with their polymeric matrix, fiber type and pretreatments, and extrusion process conditions.
Journal ArticleDOI
Multifunctional Electromagnetic Interference Shielding Ternary Alloy (Ni-W-P) Decorated Fabric with Wide-Operating-Range Joule Heating Performances.
Yu Bai,Feng Qin,Yinxiang Lu +2 more
TL;DR: The prepared Ni-W-P coated PA fabric with prominent chemical stability and mechanical robustness endows enormous potential in multi-scene applications.
Journal ArticleDOI
Effect of hemp fiber length on the mechanical and thermal properties of polypropylene/SEBS/hemp fiber composites
TL;DR: In this article, the effect of fiber length on the properties of composites was studied in a complex system consisting in polypropylene (PP)/poly[styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS)/HF composite.
Journal ArticleDOI
Lignocellulosic fiber breakage in a molten polymer. Part 3. Modeling of the dimensional change of the fibers during compounding by twin screw extrusion
TL;DR: In this article, the main impact of processing parameters on the fiber dimensions is analyzed and a flow model is used to better interpret these results and lead to a predictive approach of fiber breakage during twin-screw extrusion, in order to optimize the compounding process.
Journal ArticleDOI
Lignocellulosic fiber breakage in a molten polymer. Part 1. Qualitative analysis using rheo-optical observations
Romain Castellani,E. Di Giuseppe,Johnny Beaugrand,Johnny Beaugrand,Simon Dobosz,Simon Dobosz,Françoise Berzin,Françoise Berzin,Bruno Vergnes,Tatiana Budtova +9 more
TL;DR: In this article, rheo-optical experiments were used for a direct observation of fibers' behavior when sheared in a molten thermoplastic matrix, and fiber types from four vegetal species were studied: hemp, flax, sisal and miscanthus.
References
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Journal ArticleDOI
Effect of processing variables on the mechanical properties of sisal-fiber-reinforced polypropylene composites
TL;DR: In this paper, the effect of chemical treatment on the tensile properties of sisal/PP composites was investigated, and it was observed that all the treatments enhanced the composites considerably, but to varying degrees.
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Preparation and properties of polypropylene composites reinforced with wheat and flax straw fibres: Part II Analysis of composite microstructure and mechanical properties
TL;DR: In this paper, the microstructure and mechanical properties of polypropylene composites containing flax and wheat straw fibres are discussed, and the nature and consequences of fibre damage induced during melt-processing operations, fibre orientation occurring in mouldings, and possible interfacial adhesion between the matrix and fibres.
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Determination of shear rate and viscosity from batch mixer data
TL;DR: In this paper, a general analysis of shear rate and viscosity from batch mixer rotor speed and torque data is presented, and it is shown that Ri is a universal quantity practically insensitive to the nature and to the rheological behavior of the fluid under mixing.
Journal ArticleDOI
Flax fibre–polyester composites
TL;DR: In this paper, the effect of processing conditions on fibre length distribution and the dependence of the composite mechanical properties on fibre content are investigated, showing that there is no adhesion between matrix and fibres.
Journal ArticleDOI
Mechanical properties of short-flax-fibre reinforced compounds
TL;DR: In this paper, the mechanical properties of flax/polypropylene compounds, manufactured both with a batch kneading and an extrusion process, were determined and compared with the properties of Natural fibre Mat Thermoplastic (NMT) composites.