A mechanism for ageing in a deeply supercooled molecular glass.
Chem Commun (Camb)
; 57(52): 6368-6371, 2021 Jun 29.
Article
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| MEDLINE
| ID: mdl-34105533
ABSTRACT
Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films of cis-methyl formate, provide the first direct assessment of the energy barrier to secondary relaxation in a molecular glass. At temperatures far below the glass transition temperature, the mechanism of relaxation is shown to be through hindered molecular rotation. Magnetically-polarised neutron scattering experiments exclude diffusion, which is demonstrated to take place only close to the glass transition temperature.
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2021
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