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Flexural properties of fully biodegradable alpha-grass fibers reinforced starch-based thermoplastics
Affiliation:1. Design, Development and Product Innovation, Department of Organization, Business, University of Girona, c/M. Aurèlia Capmany, nº 61, Girona 17071, Spain;2. Group LEPAMAP, Department of Chemical Engineering, University of Girona, c/M. Aurèlia Capmany, nº 61, Girona 17071, Spain;3. Laboratoire Sciences des Materiaux et Envirnment (LMSE), Faculte des Sciences de Sfax, University of Sfax, BP 802-3018, Sfax, Tunisia;1. Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via G. Di Biasio 43, 03043 Cassino, FR, Italy;2. Department of Civil Engineering, University of Salerno, via Ponte don Melillo, 84084 Fisciano, SA, Italy;1. Fachgebiet Massivbau und Baukonstruktion, Technische Universität Kaiserslautern, Paul-Ehrlich-Straße, D-67663 Kaiserslautern, Germany;2. Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milan, Italy;1. Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia;2. Centre for Advanced Research on Energy, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia;3. Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;4. Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;1. University of Sfax, Faculty of Science, LMSE, BP 1171, 3000 Sfax, Tunisia;2. Group LEPAMAP, Department of Chemical Engineering, University of Girona, c/M. Aurèlia Capmany, n° 61, Girona 17071, Spain;1. LEPAMAP Group, Department of Chemical Engineering, University of Girona, Girona 17071, Spain;2. Agri-Food Engineering and Biotechnology Dept., Polytechnic University of Catalunya, Castelldefels 08860, Spain;3. Materials Science and Metallurgic Engineering Dept., Polytechnic University of Catalunya, Barcelona 08019, Spain;4. Design, Development and Product Innovation, Dept. of Organization, Business, University of Girona, Girona 17071, Spain;1. University of Sfax, Faculty of Science, LMSE, BP 1171-3000 Sfax, Tunisia;2. Design, Development and Product Innovation, Dept. of Organization, Business, University of Girona, c/M. Aurèlia Capmany, n° 61, Girona 17071, Spain;3. Group LEPAMAP, Department of Chemical Engineering, University of Girona, c/M. Aurèlia Capmany, n° 61, Girona 17071, Spain
Abstract:This work has the aim of study the flexural properties of alpha-grass reinforced starch-based composites. The composite materials contain alpha-fibers in the range from 5 to 35 wt%. The reinforcing fibers were submitted to an alkali treatment to create a good interphase between the fibers and the matrix. It was observed that a mild 2.5 h cooking process was enough to create a good interphase, while longer periods rendered lesser improvements. The surface charges of the fibers and the matrix were determined by polyelectrolyte titration, and it was found that after the alkaline treatment both were similar. The composite materials were injection molded and tested under flexural conditions. All the flexural properties of the studies composites increased linearly with the reinforcement contents. The micromechanics of the flexural modulus and strength were studied and compared with that of tensile modulus and strength. It was established that the efficiency factors for the tensile and flexural properties were statistically similar. Three different methods were used to compute the intrinsic flexural strength from the available data. Finally the Weibull theory was used to study the best prediction of the standard deviation of the intrinsic flexural modulus.
Keywords:A. Fibers  B. Mechanical properties  B. Fibre/matrix bond  C. Analytical  modelling  D. Mechanical testing
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