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Self‐healing triggering mechanism in epoxy‐based material containing microencapsulated amino‐polysiloxane

Da Costa, Sara Ferreira; Zuber, Marcus; Zakharova, Margarita ORCID iD icon; Mikhaylov, Andrey; Baumbach, Tilo; Kunka, Danays; Pezzin, Sergio Henrique

Abstract:

This work combines non-destructive X-ray micro-computed tomography (µCT) and scanning electron microscopy (SEM) to study the self-healing triggering mechanism in a system consisting of an epoxy resin, based on diglycidyl ether of bisphenol A, with embedded poly(urea-formaldehyde) (PUF) microcapsules filled with an amino-functional polysiloxane (PDMS-a) as a healing agent. µCT and SEM analyses proved that PDMS-a was effective in filling the microcrack areas, providing an efficient self-healing process, and confirmed that the main mechanisms for increasing fracture toughness are due to crack bowing and deflections. It was also observed that the diameter and shell thickness of the microcapsules are essential factors for their dispersion and integrity into the polymer matrix. PUF microcapsules with shell thickness of ca. 0.4 µm and diameters <60 µm were stable and well dispersed within the matrix. These findings shed light for understanding the increase of the fracture toughness, after self-healing, reported in our previous study of this system.


Verlagsausgabe §
DOI: 10.5445/IR/1000136025
Veröffentlicht am 30.03.2022
Originalveröffentlichung
DOI: 10.1002/nano.202100091
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Karlsruhe School of Optics & Photonics (KSOP)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2022
Sprache Englisch
Identifikator ISSN: 2688-4011, 2688-4011
KITopen-ID: 1000136025
HGF-Programm 43.35.01 (POF IV, LK 01) Platform for Correlative, In Situ & Operando Charakterizat.
Weitere HGF-Programme 56.13.11 (POF IV, LK 01) Building Blocks of Life: Structure and Function
Erschienen in Nano select
Verlag Wiley-VCH Verlag
Band 3
Heft 3
Seiten 577-593
Schlagwörter Proposal 2019-022-027010: DLW, EBL, XRL
Nachgewiesen in Dimensions
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