Study of the glass transition order parameter in amorphous polybutadiene by incoherent neutron scattering

B. Frick, D. Richter, W. Petry, U. Buchenau

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Abstract

The temperature dependent elastic incoherent scattering from a glass forming polybutadiene was studied using high resolution neutron spectroscopy. This elastic scattering measures directly the non-ergodicity order parameter of the glass transition. We observed an anomalous decrease of this scattering setting in around 30 K below the thermodynamic glass transition, Tg, the temperature dependence of which is in agreement with the square root of T prediction of the mode coupling approach. The critical temperature of 220 K lies about 30 K above Tg. The missing elastic intensity reappears as inelastic scattering in the 1 meV range. Within the μeV resolution of the backscattering spectrometer no quasielastic scattering can be detected up to 20 K above Tg. The observed inelastic scattering may be interpreted as resulting from a continous shift of the density of states towards low frequencies as a consequence of a general softening of the structure.

Original languageEnglish
Pages (from-to)73-79
Number of pages7
JournalZeitschrift für Physik B Condensed Matter
Volume70
Issue number1
DOIs
StatePublished - Mar 1988
Externally publishedYes

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