Mechanical performance optimization through interface strength gradation in PP/glass fibre reinforced composites |
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| Affiliation: | 1. Istituto per i Polimeri, Compositi e Biomateriali – Consiglio Nazionale delle Ricerche, Via Campi Flegrei 54, 80078 Pozzuoli, NA, Italy;2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale – Università di Napoli Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy;1. Department of Polymer Engineering & Technology, University of the Punjab, Lahore, Pakistan;2. College of Engineering and Emerging Technologies, University of the Punjab, Lahore, Pakistan;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China;2. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA;3. Division of Advanced Nano-Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China;4. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW, 2006, Australia;1. Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Polymer Engineering, 1111 Budapest, Hungary;2. MTA–BME Research Group for Composite Science and Technology, M?egyetem rkp. 3, 1111 Budapest, Hungary;3. University of Trento, Department of Industrial Engineering, via Sommarive 9, 38123 Trento, Italy |
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| Abstract: | A new design for thermoplastic composites based on the gradation of the interlaminar interface strength (IGIS) has been developed with the aim of coupling high impact resistance with high static properties. IGIS laminates have been prepared by properly alternating layers of woven fabric with layers of compatibilized or not compatibilized polymeric films. To prove the new concept, polypropylene (PP) and glass fibres woven fabrics have been used to prepare composites by using the film stacking technique. Maleated PP, able to compatibilize polypropylene with glass fibres, has been used to manage the interface strength layer by layer.The flexural and low-velocity impact characterizations have shown that the presence of the coupling agent in conventional composite structures (prepared with fully compatibilized polymeric layers) improves the static flexural properties through the strengthening of the matrix/fibre interface but considerably lowers the low velocity impact resistance of the composite, in terms of maximum load before fibre breakage and recovered energy after impact. The use of the IGIS design, that grade the interface strength through the laminate thickness, allows to prepare composites with both high flexural properties and high impact resistance, without affecting the balance and type of the reinforcement configuration. |
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| Keywords: | Interlaminar graded interface strength (IGIS) A Thermoplastic resin A Glass fibres B Impact behaviour B Mechanical properties |
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