| Autor: |
Buzin, A. I., Godovsky, Yu. K., Makarova, N. N., Fang, J., Wang, X., Knobler, C. M. |
| Zdroj: |
The Journal of Physical Chemistry - Part B; December 23, 1999, Vol. 103 Issue: 51 p11372-11381, 10p |
| Abstrakt: |
We report studies of the collapse of monolayers of cyclolinear poly(organosiloxane)s that consist of six-membered rings joined by oxygen bridges and that contain two phenyl groups per monomer unit. Surface pressure−area isotherms show that these films undergo a stepwise collapse. The organization within the films has been examined at different stages of the collapse process by Brewster-angle microscopy. Films transferred to mica by the Langmuir−Blodgett technique have been imaged by scanning force microscopy. Five fractions of an atactic polymer with molecular weights (MW) ranging from 8900 to 85 000 and one trans-tactic polymer (MW = 8100) have been investigated. Bilayers of the fractions with the highest MW's appear in the form of islands but the bilayers in the other samples have the form of ribbons 50−250 nm wide. |
| Databáze: |
Supplemental Index |
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