| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Katsumata, Reika
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2018Glass Transition and Self-Diffusion of Unentangled Polymer Melts Nanoconfined by Different Interfacescitations
- 2017Generating Large Thermally Stable Marangoni-Driven Topography in Polymer Films by Stabilizing the Surface Energy Gradientcitations
- 2016Marangoni instability driven surface relief grating in an azobenzene-containing polymer filmcitations
- 2014A photochemical approach to directing flow and stabilizing topography in polymer filmscitations
Places of action
| Organizations | Location | People |
|---|
article
Glass Transition and Self-Diffusion of Unentangled Polymer Melts Nanoconfined by Different Interfaces
Abstract
<p>In nanoconfined thin films, numerous studies have revealed the thickness dependencies of different thermophysical properties, including the glass transition temperature (T<sub>g</sub>) and self-diffusion coefficient (D). While quantitative relationships between these properties are well-known for bulk polymers, analogous relationships for nanoconfined polymers are still not clear. Herein, T<sub>g</sub>-D relationships are studied under nanoconfinement using spectroscopic ellipsometry for measuring T<sub>g</sub> and fluorescence recovery after photobleaching for measuring D. Poly(isobutyl methacrylate) (PiBMA) was selected as a model unentangled polymer, and it was nanoconfined to 14-300 nm thick films. Multilayered geometries incorporating PiBMA were constructed to systematically study the influence of free surfaces (i.e., polymer surfaces exposed directly to air, also called uncapped) and surfaces that were in contact with a secondary polymer (also called capped). This multilayer approach additionally allowed investigation of both relatively weak and strong interactions between the polymer and substrate, depending on the existence of hydrogen bonding. The T<sub>g</sub>-D relationship observed in nanoconfined thin films deviated from that in the bulk state (e.g., as described by Williams-Landel-Ferry and Stokes-Einstein, or similar relationships). A model was employed that considered the effects of molecular friction between the different confining interfaces and PiBMA, and it successfully described the deviation from bulk behavior.</p>