High-frequency dynamics of glass-forming polybutadiene

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

Volumn 59, Issue 4, 1999, Pages 4470-4475

  Frick, B ^f   Buchenau, U ^b   Comez, L ^a   Sokolov, A ^c   Masciovecchio, C ^d   Mermet, A ^d   Ruocco, G ^e   Sette, F ^d   Willner, L ^b  

^a UNIVERSITY OF PERUGIA   (Italy)

^b FORSCHUNGSZENTRUM JÜLICH   (Germany)

^c The University of Akron   (United States)

^d EUROPEAN SYNCHROTRON RADIATION FACILITY   (France)

^e UNIVERSITY OF L'AQUILA   (Italy)

^f INSTITUT LAUE LANGEVIN   (France)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000600966     PISSN: 1063651X     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevE.59.4470     Document Type: Article

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39. Also, at the highest temperature and for the limiting condition (Formula presented), the characteristic frequency of the structural relaxation (Formula presented) is expected to be lower than 0.4 meV. This estimation has been obtained from the (Formula presented) behavior obtained by a recent neutron spin-echo investigation of PB 24. The same condition holds for the secondary relaxation, whose existence has been demostated by Brillouin light scattering measurements 78 and which has been attributed to intrachain conformational changes of PB 8. Starting from the values of (Formula presented) obtained by BLS in the (Formula presented) limit, one obtains (Formula presented) at 320 K, so that IXS frequencies lie again in the unrelaxed region.