Epoxy toughening through high pressure and shear rate preprocessing

Fernández Zapico, Guillermo and Ohtake, Naoto and Akasaka, H. and Muñoz Guijosa, Juan Manuel (2019). Epoxy toughening through high pressure and shear rate preprocessing. "Scientific Reports" (n. 9); pp. 1-9. ISSN 2045-2322. https://doi.org/10.1038/s41598-019-53881-0.

Description

Title: Epoxy toughening through high pressure and shear rate preprocessing
Author/s:
  • Fernández Zapico, Guillermo
  • Ohtake, Naoto
  • Akasaka, H.
  • Muñoz Guijosa, Juan Manuel
Item Type: Article
Título de Revista/Publicación: Scientific Reports
Date: November 2019
ISSN: 2045-2322
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Mecánica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview

Abstract

We have successfully conceived and demonstrated a simple, scalable process for improving the fracture energy of epoxy resins. the process is based on the combined application of high pressures (in the order of GPa) and shear rates (in the order of 106 s−1) in the pre-cured polymer, obtaining mechanical forces sufficiently high to increase the reactivity of the monomers due to the scission of the epoxy groups. To achieve these high values of pressure and shear rate, we take advantage of the elastohydrodynamic phenomena occurring at lubricated higher kinematic pairs as, for example, the rolling element – track pair in ball bearings. experimental results show that, under certain combinations of pressure and shear rate, a substantial improvement in fracture toughness is obtained. SeM observations, Raman spectroscopies, nanoindentation and Gpc and nMR measurements show that the process is able to increase the polymer chain length before curing, reducing the number of potential anchor points during the subsequent curing and hence reducing the crosslinking density. the chain lengths obtained are big enough to guarantee adequate stiffness and strength due to increased chain tangling, hence overcoming the drawbacks associated with other toughness promotion methods, such as stiffness and strength reduction.

More information

Item ID: 63912
DC Identifier: http://oa.upm.es/63912/
OAI Identifier: oai:oa.upm.es:63912
DOI: 10.1038/s41598-019-53881-0
Official URL: https://www.nature.com/articles/s41598-019-53881-0
Deposited by: Memoria Investigacion
Deposited on: 23 Oct 2020 15:33
Last Modified: 23 Oct 2020 15:33
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM