Article

Pultrusion of a flax/polypropylene yarn

Institut für Allgemeinen Maschinenbau und Kunststofftechnik, Technische Universität Chemnitz, 09107 Chemnitz, Germany
Composites Part A Applied Science and Manufacturing (Impact Factor: 3.07). 05/2007; 38(5):1431-1438. DOI: 10.1016/j.compositesa.2006.01.024

ABSTRACT

The present work reports the pultrusion of a flax reinforced polypropylene commingled yarn containing discontinuous flax and polypropylene fibers. This was the first attempt to pultrude this material. Rectangular cross-sectional profiles have been successfully produced using a self-designed pultrusion line. In a series of experiments carried out with yarns of two different flax fiber contents, the pultrusion parameters were varied. In particular, the preheating and die temperatures and also the pulling speed, which are the most relevant parameters regarding the potential future pultrusion of natural fiber composite profiles at industrial scale. A complete characterization of each profile was conducted in order to examine the influence of processing parameters on the profile quality. The mechanical properties were evaluated by performing three point bending as well as Charpy impact tests.

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    • "Flexural modulus was found to be almost similar for flax/epoxy composites to epoxy reinforced with glass CSM at the same weight fraction but the flexural strength was only about two-thirds that for the GFRPs [127] Impact strength is considered to be one of the weaknesses of NFCs [42]. The highest Charpy impact energy found in the literature is for unidirectional pultruded flax/PP composites of 115 kJ/m 2 [98]. However, based on relatively low flexural properties (strength/modulus 70MPa/6GPa) for the same composites, it was assumed that this was due to poor impregnation of fibre. "

    Full-text · Dataset · Sep 2015
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    • "Flexural modulus was found to be almost similar for flax/epoxy composites to epoxy reinforced with glass CSM at the same weight fraction but the flexural strength was only about two-thirds that for the GFRPs [127] Impact strength is considered to be one of the weaknesses of NFCs [42]. The highest Charpy impact energy found in the literature is for unidirectional pultruded flax/PP composites of 115 kJ/m 2 [98]. However, based on relatively low flexural properties (strength/modulus 70MPa/6GPa) for the same composites, it was assumed that this was due to poor impregnation of fibre. "
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    ABSTRACT: Recently, there has been a rapid growth in research and innovation in the natural fibre composite (NFC) area. Interest is warranted due to the advantages of these materials compared to others, such as synthetic fibre composites, including low environmental impact and low cost and support their potential across a wide range of applications. Further benefits include low density, low machine wear and friendly fracture, such that their fractured edges are softer than for synthetic fibre composites. Much effort has gone into increasing their mechanical performance to extend the capabilities and applications of this group of materials. This review aims to provide an overview of the factors that affect the mechanical performance of NFCs and details achievements made with them.
    Full-text · Article · Sep 2015 · Composites Part A Applied Science and Manufacturing
    • "c o m / l oc a t e / c o m p o s i t e s a respect to EP [16]. Polypropylene (PP) is currently the thermoplastic matrix most widely used with NF [17] [18] [19] [20] [21] [22] [23]. However, polylactide (PLA) has also recently been combined with various NF, including jute, FF, hemp, bamboo, wood flour and wood fibres [24] [25] [26] [27] [28]. "
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    ABSTRACT: The mechanical and damping properties of unidirectional (UD) and twill 2/2 flax fibre (FF) reinforced thermoset (epoxy) and thermoplastic (polypropylene (PP) and polylactic acid (PLA)) composites containing 40 vol% of fibres have been compared with those of carbon (CF) and glass (GF) fibre reinforced epoxy composites. Thanks to the relatively low density of the FF, the specific mechanical properties of the UD FF based composites were comparable with those of the GF epoxy composites. The composites reinforced with FF also showed improved damping as reflected by dynamic mechanical analysis with respect to composites reinforced with synthetic CF and GF. For example, the addition of UD FF to epoxy led to an approximately 100 % increase in loss factor with respect to both the matrix and GF reinforced epoxy. FF/PP showed the highest damping at 25 °°C and 1 Hz of all the composites investigated (tanδδ = 0.033). However the best compromise between stiffness and damping was obtained with FF reinforced semicrystalline PLA.
    No preview · Article · Sep 2014 · Composites Part A Applied Science and Manufacturing
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