Brillouin and Umklapp scattering in polybutadiene: comparison of neutron and x-ray scattering |
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Authors: | Sokolov A P Buchenau U Richter D Masciovecchio C Sette F Mermet A Fioretto D Ruocco G Willner L Frick B |
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Affiliation: | Department of Polymer Science, University of Akron, Akron, Ohio 44325-3909, USA. |
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Abstract: | We report a comparison of high resolution inelastic x-ray Brillouin scattering to coherent inelastic neutron scattering for amorphous deuterated polybutadiene, done for one temperature in the glass phase and another one in the melt. The x-ray scattering proves to be by far the better technique for such a polymer within its present resolution bounds. The neutron scattering allows one to extend these measurements to a much better resolution, showing an additional quasielastic signal in the melt. The results suggest x-ray measurements at higher momentum transfer, to see whether they are complementary to neutrons. |
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