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A mechanism for ageing in a deeply supercooled molecular glass

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Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films ofcis-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.

TidsskriftChemical Communications
Sider (fra-til)6368-6371
Antal sider4
StatusUdgivet - 4 jul. 2021

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Publisher Copyright:
© The Royal Society of Chemistry 2021.

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