Shape Memory Composite Sandwich Structures with Self-Healing Properties

Polymers

Denise Bellisario¹  Loredana Santo¹  Leandro Iorio¹  Fabrizio Quadrini¹  George Anagnostopoulos²  Nikolaos Koutroumanis²  Costas Galiotis²  Panagiotis Pappas² 

[1] Department of Industrial Engineering, University of Rome ‘Tor Vergata’, Via del Politecnico 1, 00133 Rome, Italy;Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, University of Patras, Stadiou Str., Rio, GR 26504 Patras, Greece;

关键词: self-healing capsule;    shape memory properties;    PU foams;    micro-capsules;    sandwich composite structures;    shape memory polymer composites;   

DOI  :  10.3390/polym13183056

来源: DOAJ

【 摘 要 】

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 °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.

【 授权许可】

Unknown