Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

• Published in: Composites science and technology Vol. 72; no. 14; pp. 1639 - 1645
• Main Authors: Bilge, K., Ozden-Yenigun, E., Simsek, E., Menceloglu, Y.Z., Papila, M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 17.09.2012; Elsevier
• Subjects: A. Nanocomposites; A. Structural composites; Applied sciences; B. Delamination; Copolymers; Delaminating; E. Electro-spinning; Exact sciences and technology; Fibers and threads; Forms of application and semi-finished materials; Fracture mechanics; Interlayer; Interlayers; Laminates; Nanocomposites; Nanomaterials; Nanostructure; Polymer industry, paints, wood; Technology of polymers; A. Structural composites; A. Nanocomposites; Interlayer; E. Electro-spinning; B. Delamination; Strengthening; Laminate; Synthetic fiber; Electrospinning; Epoxy resin; Carbon nanotubes; Nanofiber; Mineral fiber; Composite material; Impact strength; Nanocomposite; Delamination; Carbon fiber; Stacking sequence; Mechanical properties; Experimental study; Tensile strength; Bending strength; Solvent spinning; Glycidyl methacrylate copolymer; Multiwalled nanotube; Styrene copolymer
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2012.07.005

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 (GIIc) 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.