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Insights into Mechanical Dynamics of Nanoscale Interfaces in Epoxy Composites Using Nanorheology Atomic Force Microscopy
[Image: see text] Interfacial polymer layers with nanoscale size play critical roles in dissipating the strain energy around cracks and defects in structural nanocomposites, thereby enhancing the material’s fracture toughness. However, understanding how the intrinsic mechanical dynamics of the inter...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10416213/ https://www.ncbi.nlm.nih.gov/pubmed/37499131 http://dx.doi.org/10.1021/acsami.3c06123 |
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author | Nguyen, Hung K. Shundo, Atsuomi Ito, Makiko Pittenger, Bede Yamamoto, Satoru Tanaka, Keiji Nakajima, Ken |
author_facet | Nguyen, Hung K. Shundo, Atsuomi Ito, Makiko Pittenger, Bede Yamamoto, Satoru Tanaka, Keiji Nakajima, Ken |
author_sort | Nguyen, Hung K. |
collection | PubMed |
description | [Image: see text] Interfacial polymer layers with nanoscale size play critical roles in dissipating the strain energy around cracks and defects in structural nanocomposites, thereby enhancing the material’s fracture toughness. However, understanding how the intrinsic mechanical dynamics of the interfacial layer determine the toughening and reinforcement mechanisms in various polymer nanocomposites remains a major challenge. Here, by means of a recently developed nanorheology atomic force microscopy method, also known as nanoscale dynamic mechanical analysis (nDMA), we report direct mapping of dynamic mechanical responses at the interface of a model epoxy nanocomposite under the transition from a glassy to a rubbery state. We demonstrate a significant deviation in the dynamic moduli of the interface from matrix behavior. Interestingly, the sign of the deviation is observed to be reversed when the polymer changes from a glassy to a rubbery state, which provides an excellent explanation for the difference in the modulus reinforcement between glassy and rubbery epoxy nanocomposites. More importantly, nDMA loss tangent images unambiguously show an enhanced viscoelastic response at the interface compared to the bulk matrix in the glassy state. This observation can therefore provide important insights into the nanoscale toughening mechanism that occurs in epoxy nanocomposites due to viscoelastic energy dissipation at the interface. |
format | Online Article Text |
id | pubmed-10416213 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-104162132023-08-12 Insights into Mechanical Dynamics of Nanoscale Interfaces in Epoxy Composites Using Nanorheology Atomic Force Microscopy Nguyen, Hung K. Shundo, Atsuomi Ito, Makiko Pittenger, Bede Yamamoto, Satoru Tanaka, Keiji Nakajima, Ken ACS Appl Mater Interfaces [Image: see text] Interfacial polymer layers with nanoscale size play critical roles in dissipating the strain energy around cracks and defects in structural nanocomposites, thereby enhancing the material’s fracture toughness. However, understanding how the intrinsic mechanical dynamics of the interfacial layer determine the toughening and reinforcement mechanisms in various polymer nanocomposites remains a major challenge. Here, by means of a recently developed nanorheology atomic force microscopy method, also known as nanoscale dynamic mechanical analysis (nDMA), we report direct mapping of dynamic mechanical responses at the interface of a model epoxy nanocomposite under the transition from a glassy to a rubbery state. We demonstrate a significant deviation in the dynamic moduli of the interface from matrix behavior. Interestingly, the sign of the deviation is observed to be reversed when the polymer changes from a glassy to a rubbery state, which provides an excellent explanation for the difference in the modulus reinforcement between glassy and rubbery epoxy nanocomposites. More importantly, nDMA loss tangent images unambiguously show an enhanced viscoelastic response at the interface compared to the bulk matrix in the glassy state. This observation can therefore provide important insights into the nanoscale toughening mechanism that occurs in epoxy nanocomposites due to viscoelastic energy dissipation at the interface. American Chemical Society 2023-07-27 /pmc/articles/PMC10416213/ /pubmed/37499131 http://dx.doi.org/10.1021/acsami.3c06123 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Nguyen, Hung K. Shundo, Atsuomi Ito, Makiko Pittenger, Bede Yamamoto, Satoru Tanaka, Keiji Nakajima, Ken Insights into Mechanical Dynamics of Nanoscale Interfaces in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title | Insights
into Mechanical
Dynamics of Nanoscale Interfaces
in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title_full | Insights
into Mechanical
Dynamics of Nanoscale Interfaces
in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title_fullStr | Insights
into Mechanical
Dynamics of Nanoscale Interfaces
in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title_full_unstemmed | Insights
into Mechanical
Dynamics of Nanoscale Interfaces
in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title_short | Insights
into Mechanical
Dynamics of Nanoscale Interfaces
in Epoxy Composites Using Nanorheology Atomic Force Microscopy |
title_sort | insights
into mechanical
dynamics of nanoscale interfaces
in epoxy composites using nanorheology atomic force microscopy |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10416213/ https://www.ncbi.nlm.nih.gov/pubmed/37499131 http://dx.doi.org/10.1021/acsami.3c06123 |
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