Surface Dynamics in Rubbed Polymer Thin Films Probed with Optical Birefringence Measurements
| Autor: | Jae-Hoon Kim, Dena Mae G. Agra, Satyendra Kumar, Alexander D. Schwab, Ali Dhinojwala |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Birefringence Materials science Polymers and Plastics business.industry Organic Chemistry Relaxation (NMR) Context (language use) Polymer Inorganic Chemistry chemistry.chemical_compound Optics chemistry Thermal Materials Chemistry Molecule Polystyrene Composite material business Glass transition |
| Zdroj: | Macromolecules. 33:4903-4909 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma9919514 |
| Popis: | Measurements of the optical birefringence were used to probe the relaxation of rubbed ultrathin polystyrene (PS) films on glass substrates. It was found that the glass transition temperature, Tg, of the films dropped by 15-20 K as the film thickness decreased from 10 Im to 5.8 nm. Experiments on thick films (10 Im) revealed that molecules closer to the polymer-air interface relax more quickly than molecules farther from the interface. These results are explained in the context of past experimental studies of thermal properties of similar ultrathin polymer films. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|