Hybrid cyanate ester resin-based nanocomposites: Increased indentation size effect due to anomalous composition of micron subsurface layer
| Autor: | Tatiana Pesina, Alexander Fainleib, Vladimir A. Bershtein, Dmitry Sakseyev, Lyudmyla Baikova |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanocomposite Polymers and Plastics Organic Chemistry Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Brittleness Cyanate ester Indentation Surface layer Composite material Dislocation 0210 nano-technology Layer (electronics) |
| Zdroj: | Polymer Testing. 53:15-18 |
| ISSN: | 0142-9418 |
| DOI: | 10.1016/j.polymertesting.2016.05.001 |
| Popis: | Hardness of materials increases with decreasing indentation depth from macro-to nano-scales, which is known as the indentation size effect (ISE). This effect has been associated with indenter shape, frictional forces, dislocation models and other features. We show an anomalously high ISE for a 1-μm subsurface layer in the hybrid nanocomposites based on densely cross-linked Cyanate Ester Resins (CER) containing functionalized 3-D POSS or 2-D MMT nanoparticles (NP). This effect disappears after mechanical stripping of the surface layer. Energy dispersive X-ray (EDX) spectral analysis shows that this anomaly was caused by increased content of NP (Si and Al elements), by 2.5 times, in the 1-μm subsurface layer. The hardness of the 1-μm subsurface layer in these brittle nanocomposites is due to its peculiar composition, and must be taken into account when considering mechanical strength and frictional properties. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect