Holzer, B. ; Strobl, G. ; Stühn, B. ; Andersen, N. H. (1994):
Local motion in the beta-transition range of partially crystalline polyethylene studied by neutron scattering.
In: Colloid and Polymer science, 272 (11), pp. 1396-1402. [Article]
Abstract
We have performed inelastic neutron scattering experiments on protonated and fully deuterated partially crystalline polyethylene. Using a high-resolution, three-axes spectrometer with an energy resolution of 80 mu eV, it was possible to detect a quasielastic process in the dynamic structure factor with a FWHM of 0.3meV. This process was shown to be active above T-0 = 260 K and its FWHM was nearly independent of temperature and scattering vector. The spatial extent of the underlying motional process was determined from the corresponding Debye-Waller factor. The mean squared displacement increases strongly with T above T-0 up to 4 Angstrom(2) at T = 380 K. Comparison with results from similar work on fully amorphous polymers suggests to relate T-0 to the glass transition of the amorphous phase in partially crystalline polyethylene. The coherent structure factor shows no evidence for a significant contribution of correlated motion to the process. A speculative explanation of the observed phenomenon as a non-equilibrium soft-mode is proposed.
| Item Type: | Article |
|---|---|
| Erschienen: | 1994 |
| Creators: | Holzer, B. ; Strobl, G. ; Stühn, B. ; Andersen, N. H. |
| Title: | Local motion in the beta-transition range of partially crystalline polyethylene studied by neutron scattering |
| Language: | English |
| Abstract: | We have performed inelastic neutron scattering experiments on protonated and fully deuterated partially crystalline polyethylene. Using a high-resolution, three-axes spectrometer with an energy resolution of 80 mu eV, it was possible to detect a quasielastic process in the dynamic structure factor with a FWHM of 0.3meV. This process was shown to be active above T-0 = 260 K and its FWHM was nearly independent of temperature and scattering vector. The spatial extent of the underlying motional process was determined from the corresponding Debye-Waller factor. The mean squared displacement increases strongly with T above T-0 up to 4 Angstrom(2) at T = 380 K. Comparison with results from similar work on fully amorphous polymers suggests to relate T-0 to the glass transition of the amorphous phase in partially crystalline polyethylene. The coherent structure factor shows no evidence for a significant contribution of correlated motion to the process. A speculative explanation of the observed phenomenon as a non-equilibrium soft-mode is proposed. |
| Journal or Publication Title: | Colloid and Polymer science |
| Journal volume: | 272 |
| Number: | 11 |
| Divisions: | 05 Department of Physics 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics) |
| Date Deposited: | 26 Feb 2010 14:13 |
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