Micro-crack behavior of carbon fiber reinforced thermoplastic modified epoxy composites for cryogenic applications |
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| Affiliation: | 1. BIN Fusion Research Team, Department of Polymer and Nano Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;2. College of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang 471003, PR China;3. WCU Program, Department of BIN Fusion Technology, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;4. Department of Hydrogen and Fuel Cell Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;5. Centre of Excellence in Engineered Fibre Composites, Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Australia;6. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China;1. Sir Lawrence Wackett Aerospace Research Centre, School of Aerospace, Mechanical & Manufacturing Engineering, RMIT University, Melbourne, Victoria 3001, Australia;2. Cooperative Research Centre for Advanced Composite Structures (CRC-ACS), Fishermans Bend, Victoria 3207, Australia;3. Mines ParisTech, Centre des Matériaux, CNRS UMR 7633, BP 87, 91003 Evry cedex, France;1. Bhabha Atomic Research Centre, Mumbai 400085, India;2. Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;1. Mechanical Engineering, National University of Ireland, Galway, Ireland;2. European Space Research and Technology Centre (ESTEC), Noordwijk, The Netherlands;3. School of Engineering, University College Cork, Ireland;1. College of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471023, PR China;2. Henan Energy and Chemical Industry Group Research Institute Co., Ltd., Zhengzhou, Henan 450001, PR China;3. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, Henan 450001, PR China;4. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA;5. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China |
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| Abstract: | Three different types of thermoplastics, poly(ether imide) (PEI), polycarbonate (PC), and poly(butylene terephthalate) (PBT) were used to modify epoxy for cryogenic applications. Carbon fiber reinforced thermoplastic modified epoxy composites were also prepared through vacuum-assisted resin transfer molding (RTM). Dynamic mechanical analysis (DMA) shows that the storage moduli of PEI, PC, and PBT modified epoxies are 30%, 21%, and 17% higher than that of the neat epoxy respectively. The impact strength of the modified epoxies at cryogenic temperature increases with increasing thermoplastic content up to 1.5 wt.% and then decreases for further loading (2.0 wt.%). The coefficient of thermal expansion (CTE) values of the PBT, PEI, and PC modified epoxies also decreased by 17.76%, 25.42%, and 30.15%, respectively, as compared with that of the neat epoxy. Optical microscopy image analysis suggests that the presence of PEI and PC in the carbon fiber reinforced epoxy composites can prevent the formation of micro-cracks. Therefore, both the PEI and PC were very effective in preventing micro-crack formation in the composites during thermal cycles at cryogenic condition due to their low CTE values and high impact strength. |
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