Dello Iacono, Stefania (2020) Intrinsic self healing thermoset from design to insustrial applications. [Tesi di dottorato]

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Item Type:	Tesi di dottorato
Lingua:	English
Title:	Intrinsic self healing thermoset from design to insustrial applications
Creators:	Creators Email Dello Iacono, Stefania stefania.delloiacono@unina.it
Date:	13 March 2020
Number of Pages:	129
Institution:	Università degli Studi di Napoli Federico II
Department:	Ingegneria Chimica, dei Materiali e della Produzione Industriale
Dottorato:	Ingegneria dei prodotti e dei processi industriali
Ciclo di dottorato:	32
Coordinatore del Corso di dottorato:	nome email Mensitieri, Giuseppe giuseppe.mensitieri@unina.it
Tutor:	nome email Mensitieri, Giuseppe UNSPECIFIED Amendola, Eugenio UNSPECIFIED
Date:	13 March 2020
Number of Pages:	129
Uncontrolled Keywords:	Intrinsic Self Healing; Diels Alder; Thermoset; Dynamic interphase
Settori scientifico-disciplinari del MIUR:	Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 - Scienza e tecnologia dei materiali Area 09 - Ingegneria industriale e dell'informazione > ING-IND/27 - Chimica industriale e tecnologica
Date Deposited:	23 Mar 2020 00:00
Last Modified:	08 Nov 2021 11:50
URI:	http://www.fedoa.unina.it/id/eprint/13179

Abstract

The development of self-healing materials is a very attractive approach to provide long-lasting and efficient protection against micro damages. Great attention from numerous research groups has been paid to polymers, composites, and coatings, which exhibit self-healing behavior at different dimensional scales. Through this thesis, the overall design flow for achieving hybrid epoxy systems containing covalent thermo-reversible bonds and the preparation and evaluation of selected examples is detailed. This work underlines that the concurring presence of thermo-reversible covalent bonds and high molecular mobility are essential requirements to develop self-healing systems. The most effective structural modification has been pursued by adjustment of the several features: average functionality of reacting precursor mixture and cross-linking density and thermosetting network and concentration of self-healing reversible bonds. Several Diels-Alder adducts have been synthesized and introduced in hybrid architecture systems, where stable bonds and thermoreversible bonds coexist. The resin formulation aimed at reaching a compromise between the mending capability of cured material and its dimensional stability at high temperatures, required during healing cycles. The Self-Healing ability were assessed by means of morphological, mechanical and spectroscopic characterization. The multiple healing feature of the system was proved: the hybrid epoxy resin was able to recover damages, still exhibiting the pristine stiffness. Satisfactory morphological and mechanical recovery results suggested that synthetic thermoreversible epoxy can envisage a new route in development of maintenance and repair strategies of structural and semi-structural components during their operative life. Furthermore, the availability of dynamic epoxies has allowed the development of smart materials, such as protective coating and re-engineered FRP. Finally, a more comprehensive approach was proposed for fiber-reinforced composites: the development and integration of an active interface, able to recover adhesive damage.

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