Interdiffusing core-shell nanofiber interleaved composites for excellent Mode I and Mode II delamination resistance

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Daelemans, Lode and Kızıldağ, Nuray and Van Paepegem, Wim and D'hooge, Dagmar R. and De Clerck, Karen (2019) Interdiffusing core-shell nanofiber interleaved composites for excellent Mode I and Mode II delamination resistance. Composites Science and Technology, 175 . pp. 143-150. ISSN 0266-3538 (Print) 1879-1050 (Online)

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Abstract

Electrospun nanofibre interleaving has a great potential for toughening of composite laminates as an effective, safe and industrially relevant method. Although many studies showcase large increases in delamination resistance, these are typically obtained under either Mode I or Mode II loading and for a wide variety of nanofibres. Here, we present a more general approach towards simultaneous excellent Mode I and Mode II delamination resistance using a single nanofibre system without the need for additional chemical modification steps or speciality polymers. It is illustrated based on the concept of interdiffusion of polycaprolactone nanofibres during the curing process into the epoxy matrix resin for improved adhesion. The results show that for a simultaneous increase in Mode I and Mode II delamination resistance, the adhesion and the fibre morphology of the nanofibres are crucial. The methodology is then expanded to allow for industrial relevant working windows by core-shell structured polyamide/polycaprolactone nanofibres. This approach results in a G(Ic) of 650 +/- 50 J m-2 (+ ca. 60% vs. virgin material) and a G(IIc)( )of 3160 +/- 35 J m-2 (+ ca. 60% vs. virgin material).
Item Type: Article
Uncontrolled Keywords: Nano composites; Fibre/matrix bond; Interphase; Fracture toughness; Electro-spinning
Divisions: Integrated Manufacturing Technologies Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Nuray Kızıldağ
Date Deposited: 24 Aug 2019 12:12
Last Modified: 26 Apr 2022 10:10
URI: https://research.sabanciuniv.edu/id/eprint/38703

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