Abstract
Instrumented-indentation testing (IIT) provided with a continuous stiffness measurement (CSM) technique was employed to measure hardness and elastic modulus profiles of thin organic/inorganic hybrid coatings on glass surfaces. Hybrids were synthesized by the hydrolytic condensation of (3- methacryloxypropyl) trimethoxysilane (MPMS) or vinyltrimethoxysilane (VMS), with 5-30 wt% tetraethoxysilane (TEOS), in the presence of formic acid. Coatings of 600-800 nm on glass substrates were obtained by dip-coating solutions of these hybrids with benzoyl peroxide (BPO) addition, and curing in an oven following a thermal cycle up to 120°C. Both hardness and elastic modulus showed a maximum value close to the surface, followed by a plateau and a significant increase at higher penetrations. Hybrids based on MPMS and 20-30 wt% TEOS exhibited a good combination of intrinsic values of hardness (0.50 GPa) and brittle index (0.06-0.07), that makes them suitable for coatings of plastic substrates.
| Original language | English |
|---|---|
| Pages (from-to) | 41-46 |
| Number of pages | 6 |
| Journal | Journal of Sol-Gel Science and Technology |
| Volume | 34 |
| Issue number | 1 |
| DOIs | |
| State | Published - Apr 2005 |
Keywords
- Brittle index
- Continuous stiffness measurement (CSM)
- Elastic modulus
- Hardness
- Hybrid coatings
- Instrumented-indentation testing (IIT)
- Ormosils
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