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Title: Relaxation transition in glass-forming polybutadiene as revealed by nuclear resonance X-ray scattering

We investigated the arrest mechanism of molecular motions in a glass forming polybutadiene near the glass transition using a new nuclear resonance synchrotron X-ray scattering technique to cover a wide time range (10{sup −9} to 10{sup −5} s) and a scattering vector Q range (9.6–40 nm{sup −1}), which have never been accessed by other methods. Owing to the wide time and Q ranges it was found for the first time that a transition of the α-process to the slow β-process (or the Johari-Goldstein process) was observed in a Q range higher than the first peak in the structure factor S(Q) at the critical temperature T{sub c} in the mode coupling theory. The results suggest the important roles of hopping motions below T{sub c}, which was predicted by the recent extended mode coupling theory and the cooperative motions due to the strong correlation at the first peak in S(Q) in the arrest mechanism.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011 (Japan)
  2. Elettra-Sincrotrone Trieste, S. S. 14 Km 163.5, I-34149 Trieste (Italy)
  3. Research Reactor Institute, Kyoto University, Kumatori, Osaka-fu 590-0494 (Japan)
  4. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo-ken 679-5198 (Japan)
Publication Date:
OSTI Identifier:
22253181
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COUPLING; CRITICAL TEMPERATURE; GLASS; RELAXATION; RESONANCE; STRUCTURE FACTORS; SYNCHROTRONS; X-RAY DIFFRACTION