| Autor: |
Yurekli, K., Karim, A., Amis, E. J., Krishnamoorti, R. |
| Zdroj: |
Macromolecules; September 2003, Vol. 36 Issue: 19 p7256-7267, 12p |
| Abstrakt: |
The influence of the disk diameter of nanometer thick anisotropic layered silicates on the phase-separated morphology of a near-critical polystyrene (PS)−poly(vinyl methyl ether) (PVME) blend was examined using atomic force microscopy. Films with comparable amounts of thermodynamically equivalent nanoparticles varying only in lateral disk diameters were examined using a temperature gradient method and showed dramatic differences in late-stage morphology. The blends with small disk diameter (30 nm and 0.5 μm) nanoparticles exhibit a pinning of domain sizes and demonstrate an increase in the number of domains with a higher fraction of near circular structures. On the other hand, for layered silicates with large disk diameters (10 μm), the nanoparticles do not affect the morphology of the phase-separated structure and only accelerate the phase separation kinetics. The extent of domain pinning increases with increasing silicate content and results in smaller domains at higher concentrations of silicate. |
| Databáze: |
Supplemental Index |
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