Determination of fracture toughness and energy dissipation of SiO 2-poly(methyl metacrylate) hybrid films by nanoindentation

J. Alvarado-Rivera, J. Muñoz-Saldaña, R. Ramírez-Bon

Research output: Contribution to journalArticle

Abstract

In this paper we have applied different methods based on nanoindentation techniques to measure the toughness of SiO2-poly methyl-methacrylate hybrid films on organic acrylic substrates. The hybrid films were deposited by the Sol-Gel method from precursor solutions containing tetraethyl-orthosilicate, methylmethacrylate and 3-trimethoxysilyl propyl methacrylate (TMSPM) as the coupling agent. The influence of TMSPM content in the hybrid precursor solution on the fracture behavior of the hybrid films was studied. The classical indentation crack length method was applied from nanoindentation tests to determine the stress intensity factor by direct measurement of crack length from atomic force microscopy images. A second method, based on the pop-in analysis allowed the separation of crack formation from film delamination from multiple pop-ins. Finally, a third method based on energy methods is also reported and discussed. The amount of TMSPM in the precursor solution showed a strong influence on the toughness of the hybrid films. © 2011 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)5528-5534
Number of pages7
JournalThin Solid Films
Volume519
Issue number16
DOIs
StatePublished - 1 Jun 2011

Keywords

  • Fracture toughness
  • Hybrid materials
  • Mechanical properties
  • Nanoindentation
  • Sol-Gel

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