Pultrusion of a flax/polypropylene yarn
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.
Conference Proceeding: EVALUATING THE INFLUENCE OF CHEMICAL MODIFICATION ON FLAX YARN[show abstract] [hide abstract]
ABSTRACT: Natural fibres are used in polymer composites as reinforcement for its comparable characteristics with traditional fibre reinforcements. To attain good mechanical performance for natural fibre reinforced composites, good adhesion between fibre and matrix is essential. Most of the polymers are hydrophobic in nature and are more or less incompatible with hydrophilic natural fibre. Hence to reduce the hydropilicity of fibres, different surface modification methods have been adopted. In this investigation attempt to chemically modify natural fibre in the form of flax yarn is done through alkalization, silylation and acetylation. FT-IR was used to characterize the changes induced by the yarn modifications. Since these treated yarns are intended to be used as reinforcement in thermoplastic matrix, the knowledge on the thermal properties of treated yarns is necessary. For analyzing thermal stability of yarns TGA was adopted. Moisture absorption test and SEM images of modified yarn surface provide with the information on effect of chemical treatment.ECCM15 - 15TH EUROPEAN CONFERENCE ON COMPOSITE MATERIALS, Venice, Italy, 24-28 June 2012; 06/2012
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ABSTRACT: There has been a growing interest in utilizing fibers as reinforcement to produce composite materials. Scientists prefer thermoplastic polymeric matrices than thermosets due to the low production cycle, lower cost of processing and high reparability of thermoplastics. Fiber-reinforced thermoplastic matrix composites have gained commercial success in the semistructural and structural applications. Various fibers are widely used as reinforcement in thermoplastic polypropylene (PP) matrix to prepare composites. Mechanical properties of fiber-reinforced PP composites (FRPCs) are studied by many researchers and few of them are discussed in this article. Various fiber treatments, which are carried out to improve the fiber–matrix adhesion to get improved mechanical properties, are also discussed in this article. This article also focuses on coupling agents and fiber loading which affect the mechanical properties of FRPCs significantly.Journal of Thermoplastic Composite Materials 04/2013; 26(3):362-391. · 0.75 Impact Factor