Toughened carbon/epoxy composites made by using core/shell particles |
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| Affiliation: | 1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, Hubei, 430074, China;2. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, Hubei 430073, China;3. CSIRO Manufacturing, 75 Pigdons Road, Waurn Ponds, Victoria 3216, Australia;1. Eidgenössische Technische Hochschule (ETH) Zurich, Department of Materials, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland;2. Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom;1. National Institute for Materials Science, Research Center for Structural Materials, Tsukuba, Ibaraki 305-0047, Japan;2. Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan;3. National Institute for Materials Science, Research Center for Functional Materials, Tsukuba, Ibaraki 305-0044, Japan;1. Lodz University of Technology, Faculty of Chemistry, Institute of Polymer and Dye Technology, Stefanowskiego 12/16 St., 90-924 Łódź, Poland;2. Textile Research Institute, Brzezińska 5/15, 92-103 Łódź, Poland |
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| Abstract: | Toughened epoxy resin composites have been prepared by resin-transfer moulding by using a range of toughening agents. Two types of epoxy-functional preformed toughening particles were investigated and have a three-layer morphology in which the inner core is crosslinked poly(methyl methacrylate), the intermediate layer is crosslinked poly(butyl acrylate) rubber and the outer layer is a poly[(methyl methacrylate)-co-(ethyl acrylate)-co-(glycidyl methacrylate)]. The presence of glycidyl groups in the outer layer facilitates chemical reaction with the matrix epoxy resin during curing. Comparisons were made with acrylic toughening particles that have a similar structure, but which do not have the epoxy functionality in the outer shell, and with a conventional carboxy-terminated butadiene acrylonitrile (CTBN) liquid rubber toughening agent. The composites were characterised by using tensile, compression and impact testing. The fracture surfaces and sections through the moulded composites were examined by means of optical and scanning electron microscopy. Short-beam shear tests and fragmentation tests were used to investigate the interfacial properties of the composites. In general, use of the epoxy-functionalised toughening particles gave rise to superior properties compared with both the non-functionalised acrylic toughening particles and CTBN. |
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