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https://hdl.handle.net/123456789/975| Τύπος: | Άρθρο σε επιστημονικό περιοδικό |
| Τίτλος: | Healing efficiency of CNTs-modified-UF microcapsules that provide higher electrical conductivity and EMI shielding properties |
| Συγγραφέας: | [EL] Κοσαρλή, Μαρία[EN] Kosarli, Maria [EL] Πολυμέρου, Αναστασία[EN] Polymerou, Anastasia [EL] Φωτεινίδης, Γεώργιος[EN] Foteinidis, Georgios [EL] Βαζούρας, Χρήστος[EN] Vazouras, Christos [EL] Παϊπέτης, Αλκιβιάδης[EN] Paipetis, Alkiviadis |
| Ημερομηνία: | 17/08/2021 |
| Περίληψη: | In this study, the effect of the addition of multi-walled carbon nanotubes (MWCNTs), at three percentages, into the urea-formaldehyde (UF) shell-wall of microcapsules on the healing efficiency is reported. The modified shell-wall created a conductive network in semi-conductive epoxies, which led to an improvement of the electromagnetic interference shielding effectiveness (EMI SE); utilizing the excellent electrical properties of the CNTs. The microcapsule’s mean diameter and shell wall were examined via scanning electron microscopy (SEM). Thermal stability was evaluated via thermogravimetric analysis (TGA). The healing efficiency was assessed in terms of fracture toughness, while the electrical properties were measured using impedance spectroscopy. The measurements of the EMI SE were carried out in the frequency range of 7–9 GHz. The derived results indicated that the incorporation of the CNTs resulted in a decrease in the mean size of the microcapsules, while the thermal stability remained unchanged. In particular, the introduction of 0.5% w/v CNTs did not affect the healing efficiency, while it increased the initial mechanical properties of the epoxy after the incorporation of the self-healing system by 27%. At the same time, it led to the formation of a conductive network, providing electrical conductivity to the epoxies. The experimental results showed that the SE increased on average 5 dB or more after introducing conductive microcapsules. |
| Γλώσσα: | Αγγλικά |
| Σελίδες: | 13 |
| DOI: | 10.3390/polym13162753 |
| EISSN: | 2073-4360 |
| Θεματική κατηγορία: | [EL] Κεραμικά και Σύνθετα υλικά[EN] Ceramics and Composites |
| Λέξεις-κλειδιά: | multi-functional materials; self-healing polymers; EMI shielding properties |
| Κάτοχος πνευματικών δικαιωμάτων: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland |
| Όροι και προϋποθέσεις δικαιωμάτων: | This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/) |
| Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη: | https://www.mdpi.com/2073-4360/13/16/2753 |
| Ηλεκτρονική διεύθυνση περιοδικού: | https://www.mdpi.com/journal/polymers |
| Τίτλος πηγής δημοσίευσης: | Polymers |
| Τεύχος: | 16 |
| Τόμος: | 13 |
| Σελίδες τεκμηρίου (στην πηγή): | Article no 2753 |
| Σημειώσεις: | This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Greece) This research was co-financed by Greece and the European Union (European Social FundESF) through the Operational Programme ‘Human Resources Development, Education and Lifelong Learning 2014–2020’ in the context of the project ‘Smart, multifunctional, advanced composites with EMI Shielding and Self-Healing capabilities for the recovery of mechanical and electromagnetical properties- SHIELD (MIS: 5047645)’. |
| Εμφανίζεται στις συλλογές: | Ερευνητικές ομάδες |
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