In this study, Polyurea/Formaldehyde (PUF) microcapsules containing Dicyclopentadiene (DCPD) as a healing substance were fabricated in situ and mixed at relatively low concentrations (<2 wt%) with a thermosetting polyurethane (PU) foam used in turn as the core of a sandwich structure. The shape memory (SM) effect depended on the combination of the behavior of the PU foam core and the shape memory polymer composite (SMPC) laminate skins. SMPC laminates were manufactured by moulding commercial carbon fiber-reinforced (CFR) prepregs with a SM polymer interlayer. At first, PU foam samples, with and without microcapsules, were mechanically tested. After, PU foam was inserted into the SMPC sandwich structure. Damage tests were carried out by compression and bending to deform and break the PU foam cells, and then assess the structure self-healing (SH) and recovery capabilities. Both SM and SH responses were rapid and thermally activated (120 degrees C). The CFR-SMPC skins and the PU foam core enable the sandwich to exhibit excellent SM properties with a shape recovery ratio up to 99% (initial configuration recovery). Moreover, the integration of microcapsules (0.5 wt%) enables SH functionality with a structural restoration up to 98%. This simple process makes this sandwich structure ideal for different industrial applications.

Quadrini, F., Bellisario, D., Iorio, L., Santo, L., Pappas, P., Koutroumanis, N., et al. (2021). Shape Memory Composite Sandwich Structures with Self-Healing Properties. POLYMERS, 13(18) [10.3390/polym13183056].

Shape Memory Composite Sandwich Structures with Self-Healing Properties

Quadrini, F;Bellisario, D;Iorio, L;Santo, L;
2021-01-01

Abstract

In this study, Polyurea/Formaldehyde (PUF) microcapsules containing Dicyclopentadiene (DCPD) as a healing substance were fabricated in situ and mixed at relatively low concentrations (<2 wt%) with a thermosetting polyurethane (PU) foam used in turn as the core of a sandwich structure. The shape memory (SM) effect depended on the combination of the behavior of the PU foam core and the shape memory polymer composite (SMPC) laminate skins. SMPC laminates were manufactured by moulding commercial carbon fiber-reinforced (CFR) prepregs with a SM polymer interlayer. At first, PU foam samples, with and without microcapsules, were mechanically tested. After, PU foam was inserted into the SMPC sandwich structure. Damage tests were carried out by compression and bending to deform and break the PU foam cells, and then assess the structure self-healing (SH) and recovery capabilities. Both SM and SH responses were rapid and thermally activated (120 degrees C). The CFR-SMPC skins and the PU foam core enable the sandwich to exhibit excellent SM properties with a shape recovery ratio up to 99% (initial configuration recovery). Moreover, the integration of microcapsules (0.5 wt%) enables SH functionality with a structural restoration up to 98%. This simple process makes this sandwich structure ideal for different industrial applications.
2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/16 - TECNOLOGIE E SISTEMI DI LAVORAZIONE
English
PU foams
micro-capsules
sandwich composite structures
shape memory polymer composites
Quadrini, F., Bellisario, D., Iorio, L., Santo, L., Pappas, P., Koutroumanis, N., et al. (2021). Shape Memory Composite Sandwich Structures with Self-Healing Properties. POLYMERS, 13(18) [10.3390/polym13183056].
Quadrini, F; Bellisario, D; Iorio, L; Santo, L; Pappas, P; Koutroumanis, N; Anagnostopoulos, G; Galiotis, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/297329
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