Fleischer, G. ; Fujara, Franz ; Stühn, Bernd (1993)
Restricted diffusion in the regime of the order-to-disorder transition in diblock copolymers: a field gradient NMR study.
In: Macromolecules, 26 (9)
Article, Bibliographie
Abstract
The self-diffusion of diblock copolymers of polystyrene/cis-1,4-isoprene and polyisoprene homopolymers is studied using field gradient nuclear magnetic resonance. The block copolymers are shown to go through their order-to-disorder transition (ODT) at experimentally accessible temperatures. Their phase state is determined using small-angle X-ray scattering. Diffusion in the ordered, lamellar phase is found to be spatially restricted. Fast motion is possible along the lamellae and within a grain. The crossing over the enthalpic barriers between styrene and isoprene domains takes place on a much longer time scale. The ODT does not lead to an abrupt crossover to unrestricted diffusion. Local order remains even above the ODT, and the barriers disappear only gradually.
| Item Type: | Article |
|---|---|
| Erschienen: | 1993 |
| Creators: | Fleischer, G. ; Fujara, Franz ; Stühn, Bernd |
| Type of entry: | Bibliographie |
| Title: | Restricted diffusion in the regime of the order-to-disorder transition in diblock copolymers: a field gradient NMR study |
| Language: | English |
| Date: | April 1993 |
| Journal or Publication Title: | Macromolecules |
| Volume of the journal: | 26 |
| Issue Number: | 9 |
| Abstract: | The self-diffusion of diblock copolymers of polystyrene/cis-1,4-isoprene and polyisoprene homopolymers is studied using field gradient nuclear magnetic resonance. The block copolymers are shown to go through their order-to-disorder transition (ODT) at experimentally accessible temperatures. Their phase state is determined using small-angle X-ray scattering. Diffusion in the ordered, lamellar phase is found to be spatially restricted. Fast motion is possible along the lamellae and within a grain. The crossing over the enthalpic barriers between styrene and isoprene domains takes place on a much longer time scale. The ODT does not lead to an abrupt crossover to unrestricted diffusion. Local order remains even above the ODT, and the barriers disappear only gradually. |
| Divisions: | 05 Department of Physics 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics) |
| Date Deposited: | 17 May 2011 11:06 |
| Last Modified: | 28 Mar 2024 15:14 |
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