Nanoindentation testing of SiO2-PMMA hybrid films on acrylic substrates with variable coupling agent content

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

Research output: Contribution to journalArticlepeer-review

Abstract

In this work we report the influence of the molar composition of the coupling agent, as well as the curing conditions on the mechanical properties of SiO2-PMMA (polymethyl methacrylate) hybrid films deposited on organic acrylic substrates. The SiO2-PMMA hybrid films were deposited by the sol–gel method from hybrid precursor solutions with fixed molar ratio of 1:0.25 for TEOS/MMA
(Tetraethyl-orthosilicate/Methylmethacrylate) and TEOS/TMSPM (3-trimethoxysilyl propyl methacrylate) molar ratios ranging from 1:0.05 to 1:0.2. The organic compound TMSPM was used as coupling agent to enhance the bond
between the organic and inorganic molecules. The wear resistance, hardness and elastic modulus of the hybrid films were determined by nanoindentation techniques and compared to the substrate mechanical behaviour. The chemical
bonding in the hybrid films was analyzed by Fourier Transform Infrared spectroscopy and their transparency by optical transmission and reflection spectroscopy. The friction coefficient and sliding life of the hybrid films were also measured with a pin-on-disc tribometer. The surface morphology and roughness were determined from atomic force microscopy images. The hybrid films with lowest content of coupling agent showed the best mechanical performance in terms of hardness, friction coefficient and wear resistance
keeping high optical transparency.
Original languageAmerican English
Pages (from-to)312-318
Number of pages7
JournalJournal of Sol-Gel Science and Technology
Volume54
Issue number3
DOIs
StatePublished - Jun 2010

Keywords

  • Hybrid coatings
  • Nano-indentation
  • Nanoscratching
  • Pin on disc
  • Sliding life
  • Sol-gel

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