Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

Bilge, Kaan and Özden Yenigün, Elif and Şimşek, Eren and Menceloğlu, Yusuf Z. and Papila, Melih (2012) Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers. Composites Science and Technology, 72 (14). pp. 1639-1645. ISSN 0266-3538

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Surface reactive P(St-co-GMA) copolymer and P(St-co-GMA)/MWCNT fibrous mats are placed onto a conventional carbon fiber/epoxy prepreg as interlayer reinforcing material. Experimental observations are used to demonstrate excellent epoxy wetting and structural compatibility of the interlayers chemically tuned for the epoxy matrix. Comparisons of increase in mechanical performance by incorporating P(St-co-GMA) and P(St-co-GMA)/MWCNT interlayers also show the contribution of MWCNT presence in the copolymer nanofibers. Flexural strength and stiffness of (0/0/0) and (90/0/90) laminates increase up to 17% when the nanocomposite interlayers are integrated. Cross-sectional SEM analyses of the failure surfaces suggest reinforcing ability of interlayers both against transverse cracking and delamination. Further examination for the delamination resistance is presented by the End Notched Flexure (ENF) tests. An improvement up to 70% in mode II strain energy release rate (G(IIc)) is recorded for the laminates with nanocomposite interlayers. The resistance against transverse matrix cracking in the presence of interlayers is also elaborated. Charpy-impact and transverse-tension tests result in up to 20% and 27% increase in the impact energy absorbance and transverse tensile strength, respectively. Overall, the test results suggest that mechanical behavior of the laminates is enhanced by the nanofibrous interlayers chemically-tuned for epoxy crosslinking, with no weight penalty.
Item Type: Article
Uncontrolled Keywords: Nanocomposites; Structural composites; Electro-spinning; Delamination; Interlayer
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Yusuf Z. Menceloğlu
Date Deposited: 26 Nov 2012 15:04
Last Modified: 31 Jul 2019 15:51

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