Micro-crack behavior of carbon fiber reinforced thermoplastic modified epoxy composites for cryogenic applications

He, Yu-xin and Li, Qi and Kuila, Tapas and Kim, Nam Hoon and Jiang, Tongwu and Lau, Kin-tak and Lee, Joong Hee (2013) Micro-crack behavior of carbon fiber reinforced thermoplastic modified epoxy composites for cryogenic applications. Composites Part B: Engineering , 44 (1). pp. 533-539. ISSN 1359-8368


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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Published by Elsevier Ltd. Published online 29 March 2012. Permanent restricted access to published version.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 12 Sep 2012 05:04
Last Modified: 14 Oct 2014 06:50
Uncontrolled Keywords: thermosetting resin; impact behavior; thermomechanical; micro-crack density
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
09 Engineering > 0910 Manufacturing Engineering > 091010 Packaging, Storage and Transportation (excl. Food and Agricultural Products)
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1016/j.compositesb.2012.03.014
URI: http://eprints.usq.edu.au/id/eprint/21545

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