Mechanical properties of chemically-treated hemp fibre reinforced sandwich composites |
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| Authors: | MM Kabir H Wang KT Lau F Cardona T Aravinthan |
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| Affiliation: | 1. Instituto Militar de Engenharia (IME), Materials Science Department, Rio de Janeiro, Brazil;2. Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil;3. Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Brazil;1. Institute of Construction Materials, Technische Universität Dresden, Dresden, Germany;2. Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES), United Nations University, Dresden, Germany;3. Department of Civil and Environmental Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rua Marques de São Vicente 225, 22453-900 Rio de Janeiro - RJ, Brazil;1. Dept. of Engineering Technology and Construction Management, Sustainable Material and Renewable Technology (SMART) Laboratory, University of North Carolina at Charlotte (UNCC), Charlotte, NC 28223, United States;2. Dept. of Civil and Environmental Engineering, SMART Laboratory, UNCC, Charlotte, NC, United States;1. Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA;2. Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | In this study, hemp fabrics were used as reinforcements with polyester resin to form composite skins while short hemp fibres with polyester as a core for making composite sandwich structures. To improve the fibre matrix adhesion properties, alkalisation, silane and acetylation treatments on the fibres surface were carried out. Examinations through fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were conducted to investigate the physical and thermal properties of the fibres. Mechanical properties such as flexural and compressive strengths of the sandwich structures made by treated and untreated hemp fibres were studied. Based on the results obtained from the experiments, it was found that the fibre treated with alkalic solution and post-soaked by 8% NaOH exhibited better mechanical strength as compared with other treated and untreated fibre composite samples. Besides, DSC and TGA analysis showed that the thermal stability of all treated fibre was enhanced as compared with untreated samples. |
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