Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents
The development of improved cold-cured resins, to be used as either adhesives or matrices for FRP (fiber reinforced polymer) composites employed in the construction industry, has become the focus of several academic and industrial research projects. It is expected that the use of nano-structured org...
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doaj-3bcbfa45d2be4b0886ab56c93c1d9eba2020-11-25T01:04:20ZengMDPI AGPolymers2073-43602018-12-011111410.3390/polym11010014polym11010014Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic SolventsFrancesca Lionetto0Alessia Timo1Mariaenrica Frigione2Department of Engineering for Innovation, University of Salento, via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, via per Monteroni, 73100 Lecce, ItalyDepartment of Engineering for Innovation, University of Salento, via per Monteroni, 73100 Lecce, ItalyThe development of improved cold-cured resins, to be used as either adhesives or matrices for FRP (fiber reinforced polymer) composites employed in the construction industry, has become the focus of several academic and industrial research projects. It is expected that the use of nano-structured organic–inorganic hybrid materials could represent a realistic alternative to commercial epoxy-based resins due to their superior properties, especially in terms of higher durability against: moisture, temperatures, harsh environments, and fire. In this context, organic–inorganic epoxy hybrids were synthesized by a modified sol–gel method without the addition of water. The experimental formulations were prepared starting from a mixture of a silane-functionalized epoxy resin, alkoxysilane components and a deep eutectic solvent (DES) based on a blend of choline chloride and urea. The latter was added in two different loads in order to analyze in depth its effect as a promoter for an effective dispersion of silica nano-phases, formed through hydrolysis and condensation reactions, into the cross-linked epoxy network. The produced formulations were cold-cured for different time spans in the presence of two hardeners, both suitable for a curing process at ambient temperature. In this first part of a wider experimental program, several analyses were carried out on the liquid (rheological and calorimetric) and cold-cured (calorimetric, thermogravimetric, dynamic-mechanical, flexural mechanical, and morphological) systems to evaluate and quantify the improvement in properties brought about by the presence of two different phases (organic and inorganic) in the same epoxy-based hybrid system.http://www.mdpi.com/2073-4360/11/1/14cold-cured epoxydeep eutectic solventsionic liquidnano-compositesorganic-inorganic hybridssol–gel techniquethermosetting resinscross-linking |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Francesca Lionetto Alessia Timo Mariaenrica Frigione |
spellingShingle |
Francesca Lionetto Alessia Timo Mariaenrica Frigione Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents Polymers cold-cured epoxy deep eutectic solvents ionic liquid nano-composites organic-inorganic hybrids sol–gel technique thermosetting resins cross-linking |
author_facet |
Francesca Lionetto Alessia Timo Mariaenrica Frigione |
author_sort |
Francesca Lionetto |
title |
Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents |
title_short |
Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents |
title_full |
Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents |
title_fullStr |
Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents |
title_full_unstemmed |
Cold-Cured Epoxy-Based Organic–Inorganic Hybrid Resins Containing Deep Eutectic Solvents |
title_sort |
cold-cured epoxy-based organic–inorganic hybrid resins containing deep eutectic solvents |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2018-12-01 |
description |
The development of improved cold-cured resins, to be used as either adhesives or matrices for FRP (fiber reinforced polymer) composites employed in the construction industry, has become the focus of several academic and industrial research projects. It is expected that the use of nano-structured organic–inorganic hybrid materials could represent a realistic alternative to commercial epoxy-based resins due to their superior properties, especially in terms of higher durability against: moisture, temperatures, harsh environments, and fire. In this context, organic–inorganic epoxy hybrids were synthesized by a modified sol–gel method without the addition of water. The experimental formulations were prepared starting from a mixture of a silane-functionalized epoxy resin, alkoxysilane components and a deep eutectic solvent (DES) based on a blend of choline chloride and urea. The latter was added in two different loads in order to analyze in depth its effect as a promoter for an effective dispersion of silica nano-phases, formed through hydrolysis and condensation reactions, into the cross-linked epoxy network. The produced formulations were cold-cured for different time spans in the presence of two hardeners, both suitable for a curing process at ambient temperature. In this first part of a wider experimental program, several analyses were carried out on the liquid (rheological and calorimetric) and cold-cured (calorimetric, thermogravimetric, dynamic-mechanical, flexural mechanical, and morphological) systems to evaluate and quantify the improvement in properties brought about by the presence of two different phases (organic and inorganic) in the same epoxy-based hybrid system. |
topic |
cold-cured epoxy deep eutectic solvents ionic liquid nano-composites organic-inorganic hybrids sol–gel technique thermosetting resins cross-linking |
url |
http://www.mdpi.com/2073-4360/11/1/14 |
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