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Dynamics of liquid sulphur around the equilibrium polymerization transition

✍ Scribed by L. Descôtes; R. Bellissent; P. Pfeuty; A.J. Dianoux

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
263 KB
Volume
201
Category
Article
ISSN
0378-4371

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✦ Synopsis

Liquid sulphur has been known since the beginning of this century to show at a temperature T, = 160°C a liquid-liquid transition assumed to consist of the polymerization of S, rings into very long polymeric chains. A first neutron scattering study of the liquid local order enabled us to check this assumption at a microscopic level. Then, the vibrational density of states and local motions were studied by time-of-flight (TOF) inelastic neutron scattering as a function of temperature, below and above T,. Both the decrease of the modes characteristic of S, rings and the evolution of the quasielastic scattering with temperature are consistent with the picture of a polymer transition at T, followed by a ring-chain equilibrium.

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