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.
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ABSTRACT: This review article describes the recent developments of natural fiber reinforced polypropylene (PP) composites. Natural fibers are low-cost, recyclable, and eco-friendly materials. Due to eco-friendly and bio-degradability characteristics of these natural fibers, they are considered as strong candidates to replace the conventional glass and carbon fibers. The chemical, mechanical, and physical properties of natural fibers have distinct properties; depending upon the cellulosic content of the fibers which varies from fiber to fiber. The mechanical properties of composites are influenced mainly by the adhesion between matrix and fibers. Chemical and physical modification methods were incorporated to improve the fiber-matrix adhesion resulting in the enhancement of mechanical properties of the composites. The most important natural fibers are jute, flax, and coir and their novel processing technics to develop natural fiber reinforced composites are also described.Journal of Reinforced Plastics and Composites 05/2009; 28(10):1169-1189. · 0.90 Impact Factor
Conference Paper: 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
- Materials & Design. 01/2014; 59:359-368.