Cyclic Olefin Copolymer Interleaves for Thermally Mendable Carbon/Epoxy Laminates.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Riccardo Costan ZoviAlessandro Pegoretti

Abstract

Thin cyclic olefin copolymer (COC) foils were used as intrinsic thermoplastic healing agents in carbon fiber (CF)-reinforced epoxy laminates. COC films were produced by hot pressing and were interleaved in the interlaminar regions between each EP/CF lamina, during the hand layup fabrication of the laminates. Three samples were produced, i.e., the neat EP/CF laminate without COC, and two laminates containing COC layers with a thickness of 44 μm and 77 μm, respectively. It was observed that the fiber volume fraction decreased, and the porosity increased with the introduction of COC layers, and this effect was more evident when thick films were used. These two effects, combined with the sub-optimal adhesion between COC and EP, caused a decrease in the mechanical properties (i.e., the elastic modulus, flexural strength, interlaminar shear strength and interlaminar fracture toughness) of the laminates. Specimens subjected to mode I interlaminar fracture toughness test were then thermally mended under pressure by resistive heating, through the Joule effect of conductive CFs. A temperature of approximately 190 °C was reached during the healing treatment. The healing efficiency was evaluated as the ratio of critical strain energy relea...Continue Reading

References

Feb 22, 2007·Journal of the Royal Society, Interface·S A HayesF R Jones
Apr 21, 2009·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·S van der ZwaagW G Sloof
Apr 2, 2010·ACS Applied Materials & Interfaces·Xiaofan LuoPatrick T Mather
Aug 3, 2012·Journal of Nanoscience and Nanotechnology·D PedrazzoliA Pegoretti
May 13, 2020·Materials·Haroon MahmoodAlessandro Pegoretti

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Methods Mentioned

BETA
delamination
thermal treatment

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