Jang, Woo-Sik, Koo, Peter, Sykorsky, Marcin, Narayanan, Suresh, Sandy, Alec, Mochrie, Simon G. J. (2013) The Static and Dynamic Structure Factor of a Diblock Copolymer Melt via Small-Angle X-ray Scattering and X-ray Photon Correlation Spectroscopy. Macromolecules, 46 (21). pp. 8628-8637. ISSN 0024-9297
Abstract
We present a detailed X-ray scattering study of the static and dynamic behavior of a styrene–isoprene diblock copolymer melt with a styrene volume fraction of 0.3468. At 115 and 120 °C, we observe splitting of the principal Bragg peak, which we attribute to phase coexistence of hexagonal cylindrical and cubic double-gyroid structure. In the disordered phase, above 130 °C, we have characterized the dynamics of composition fluctuations via X-ray photon correlation spectroscopy. Near the peak of the static structure factor, these fluctuations show stretched-exponential relaxations, characterized by a stretching exponent of about 0.36 for a range of temperatures immediately above the MST. The corresponding characteristic relaxation times vary exponentially with temperature, changing by a factor of 2 for each 2 °C change in temperature. At low wavevectors, the measured relaxations are diffusive with relaxation times that change by a factor of 2 for each 8 °C change in temperature.
| Item Type: | Paper |
|---|---|
| Subjects: | Investigative techniques and equipment > X-Ray Diffraction |
| CSHL Authors: | |
| Communities: | CSHL labs > Koo Lab |
| Depositing User: | Matthew Dunn |
| Date: | 2013 |
| Date Deposited: | 16 Sep 2019 18:20 |
| Last Modified: | 16 Sep 2019 18:59 |
| URI: | https://repository.cshl.edu/id/eprint/38397 |
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