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Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes

The extensive use of adhesives in many structural applications in the transport industry and particularly in the aeronautic field is due to numerous advantages of bonded joints. However, still many researchers are working to enhance the mechanical properties and rheological performance of adhesives...

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Autores principales: Barra, Giuseppina, Vertuccio, Luigi, Vietri, Umberto, Naddeo, Carlo, Hadavinia, Homayoun, Guadagno, Liberata
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666937/
https://www.ncbi.nlm.nih.gov/pubmed/28946691
http://dx.doi.org/10.3390/ma10101131
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author Barra, Giuseppina
Vertuccio, Luigi
Vietri, Umberto
Naddeo, Carlo
Hadavinia, Homayoun
Guadagno, Liberata
author_facet Barra, Giuseppina
Vertuccio, Luigi
Vietri, Umberto
Naddeo, Carlo
Hadavinia, Homayoun
Guadagno, Liberata
author_sort Barra, Giuseppina
collection PubMed
description The extensive use of adhesives in many structural applications in the transport industry and particularly in the aeronautic field is due to numerous advantages of bonded joints. However, still many researchers are working to enhance the mechanical properties and rheological performance of adhesives by using nanoadditives. In this study the effect of the addition of Multi-Wall Carbon Nanotubes (MWCNTs) with Polyhedral Oligomeric Silsesquioxane (POSS) compounds, either Glycidyl Oligomeric Silsesquioxanes (GPOSS) or DodecaPhenyl Oligomeric Silsesquioxanes (DPHPOSS) to Tetraglycidyl Methylene Dianiline (TGMDA) epoxy formulation, was investigated. The formulations contain neither a tougher matrix such as elastomers nor other additives typically used to provide a closer match in the coefficient of thermal expansion in order to discriminate only the effect of the addition of the above-mentioned components. Bonded aluminium single lap joints were made using both untreated and Chromic Acid Anodisation (CAA)-treated aluminium alloy T2024 adherends. The effects of the different chemical functionalities of POSS compounds, as well as the synergistic effect between the MWCNT and POSS combination on adhesion strength, were evaluated by viscosity measurement, tensile tests, Dynamic Mechanical Analysis (DMA), single lap joint shear strength tests, and morphological investigation. The best performance in the Lap Shear Strength (LSS) of the manufactured joints has been found for treated adherends bonded with epoxy adhesive containing MWCNTs and GPOSS. Carbon nanotubes have been found to play a very effective bridging function across the fracture surface of the bonded joints.
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spelling pubmed-56669372017-11-09 Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes Barra, Giuseppina Vertuccio, Luigi Vietri, Umberto Naddeo, Carlo Hadavinia, Homayoun Guadagno, Liberata Materials (Basel) Article The extensive use of adhesives in many structural applications in the transport industry and particularly in the aeronautic field is due to numerous advantages of bonded joints. However, still many researchers are working to enhance the mechanical properties and rheological performance of adhesives by using nanoadditives. In this study the effect of the addition of Multi-Wall Carbon Nanotubes (MWCNTs) with Polyhedral Oligomeric Silsesquioxane (POSS) compounds, either Glycidyl Oligomeric Silsesquioxanes (GPOSS) or DodecaPhenyl Oligomeric Silsesquioxanes (DPHPOSS) to Tetraglycidyl Methylene Dianiline (TGMDA) epoxy formulation, was investigated. The formulations contain neither a tougher matrix such as elastomers nor other additives typically used to provide a closer match in the coefficient of thermal expansion in order to discriminate only the effect of the addition of the above-mentioned components. Bonded aluminium single lap joints were made using both untreated and Chromic Acid Anodisation (CAA)-treated aluminium alloy T2024 adherends. The effects of the different chemical functionalities of POSS compounds, as well as the synergistic effect between the MWCNT and POSS combination on adhesion strength, were evaluated by viscosity measurement, tensile tests, Dynamic Mechanical Analysis (DMA), single lap joint shear strength tests, and morphological investigation. The best performance in the Lap Shear Strength (LSS) of the manufactured joints has been found for treated adherends bonded with epoxy adhesive containing MWCNTs and GPOSS. Carbon nanotubes have been found to play a very effective bridging function across the fracture surface of the bonded joints. MDPI 2017-09-25 /pmc/articles/PMC5666937/ /pubmed/28946691 http://dx.doi.org/10.3390/ma10101131 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Barra, Giuseppina
Vertuccio, Luigi
Vietri, Umberto
Naddeo, Carlo
Hadavinia, Homayoun
Guadagno, Liberata
Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title_full Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title_fullStr Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title_full_unstemmed Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title_short Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes
title_sort toughening of epoxy adhesives by combined interaction of carbon nanotubes and silsesquioxanes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666937/
https://www.ncbi.nlm.nih.gov/pubmed/28946691
http://dx.doi.org/10.3390/ma10101131
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