Fleischer, G. ; Karger, J. ; Stühn, B. (1997)
Chain diffusion in the melt of an asymmetric diblock copolymer in the disordered and ordered state.
In: Colloid and Polymer Science, 275 (9)
Article, Bibliographie
Abstract
The self-diffusion in a polystyrene-b-polyisoprene diblock copolymer with a strongly asymmetric composition was investigated with dependence on temperature by pulsed field gradient (PFG) NMR. The diblock shows with decreasing temperature a disorder-to-order-transition at T-ODT = 393 K from a micellar liquid-like to a bcc ordered state which was recently measured by SAXS [M. Schwab and B. Stühn, Phys. Rev. Lett. (1996) 76: 924]. Two diffusivities were observed, one of the free diblock chains and one of the diblock chains fixed in micelles. The volume fraction of free chains decreases with decreasing temperature. The diffusivity of the free chains must be related to chain stretching. The experiments show that within the time of the NMR experiment (300 ms) there is no exchange between the diblock chains in the free state and those fixed in the core of the micelles.
| Item Type: | Article |
|---|---|
| Erschienen: | 1997 |
| Creators: | Fleischer, G. ; Karger, J. ; Stühn, B. |
| Type of entry: | Bibliographie |
| Title: | Chain diffusion in the melt of an asymmetric diblock copolymer in the disordered and ordered state |
| Language: | English |
| Date: | September 1997 |
| Journal or Publication Title: | Colloid and Polymer Science |
| Volume of the journal: | 275 |
| Issue Number: | 9 |
| Abstract: | The self-diffusion in a polystyrene-b-polyisoprene diblock copolymer with a strongly asymmetric composition was investigated with dependence on temperature by pulsed field gradient (PFG) NMR. The diblock shows with decreasing temperature a disorder-to-order-transition at T-ODT = 393 K from a micellar liquid-like to a bcc ordered state which was recently measured by SAXS [M. Schwab and B. Stühn, Phys. Rev. Lett. (1996) 76: 924]. Two diffusivities were observed, one of the free diblock chains and one of the diblock chains fixed in micelles. The volume fraction of free chains decreases with decreasing temperature. The diffusivity of the free chains must be related to chain stretching. The experiments show that within the time of the NMR experiment (300 ms) there is no exchange between the diblock chains in the free state and those fixed in the core of the micelles. |
| Divisions: | 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics) 05 Department of Physics |
| Date Deposited: | 27 Feb 2010 12:29 |
| Last Modified: | 05 Mar 2013 09:32 |
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