Manufacture and characterisation of thermoplastic composites made from PLA/hemp co-wrapped hybrid yarn prepregs |
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| Affiliation: | 1. School of Engineering, University of Borås, SE-501 90 Borås, Sweden;2. The Swedish School of Textiles, University of Borås, SE-501 90 Borås, Sweden;1. University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima 4, 05100 Terni, Italy;2. University of Camerino, School of Architecture and Design, viale della Rimembranza, 63100 Ascoli Piceno, Italy;3. Institute of Polymers, Composites and Biomaterials, National Research Council, P.le Fermi, 1, 80055 Portici, NA, Italy;4. Institute of Polymer Science and Technology, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain;1. School of Aerospace Engineering and Applied Mechanics, Tongji University, No. 1239 Siping Road, Shanghai 200092, PR China;2. State Key Laboratory of Molecular Engineering of Polymers, Fudan University, No. 220 Handan Road, Shanghai 200433, PR China;1. CCComposites Laboratory, University of Antioquia, Calle 67 No. 53 - 108, Medellín, Colombia;2. Advanced Biomaterials and Regenerative Medicine Group, University of Antioquia, Calle 67 No. 53 - 108, Medellín, Colombia;1. Faculty of Civil Engineering, Universiti Teknologi MARA, Malaysia;2. Faculty of Science and Engineering, University of Waikato, New Zealand |
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| Abstract: | PLA/hemp co-wrapped hybrid yarns were produced by wrapping PLA filaments around a core composed of a 400 twists/m and 25 tex hemp yarn (Cannabis sativa L) and 18 tex PLA filaments. The hemp content varied between 10 and 45 mass%, and the PLA wrapping density around the core was 150 and 250 turns/m. Composites were fabricated by compression moulding of 0/90 bidirectional prepregs, and characterised regarding porosity, mechanical strength and thermal properties by dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC). Mechanical tests showed that the tensile and flexural strengths of the composites markedly increased with the fibre content, reaching 59.3 and 124.2 MPa when reinforced with 45 mass% fibre, which is approximately 2 and 3.3 times higher compared to neat PLA. Impact strength of the composites decreased initially up to 10 mass% fibre; while higher fibre loading (up to 45 mass%) caused an increase in impact strength up to 26.3 kJ/m2, an improvement of about 2 times higher compared to neat PLA. The composites made from the hybrid yarn with a wrapping density of 250 turns/m showed improvements in mechanical properties, due to the lower porosity. The fractured surfaces were investigated by scanning electron microscopy to study the fibre/matrix interface. |
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| Keywords: | A. Natural fibre composites B. Mechanical properties C. Thermal analysis D. Compression moulding |
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