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From strong to fragile glass formers: Secondary relaxation in polyalcohols

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48545

Paluch,  M.
MPI for Polymer Research, Max Planck Society;

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Zitation

Döß, A., Paluch, M., Sillescu, H., & Hinze, G. (2002). From strong to fragile glass formers: Secondary relaxation in polyalcohols. Physical Review Letters, 88(9): 095701.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-666F-F
Zusammenfassung
We have studied details of the molecular origin of slow secondary relaxation near T-g in a series of neat polyalcohols by means of dielectric spectroscopy and H-2 NMR. From glycerol to threitol, xylitol, and sorbitol the appearance of the secondary relaxation changes gradually from a wing-type scenario to a pronounced beta peak. It is found that in sorbitol the dynamics of the whole molecule contributes equally to the beta process, while in glycerol the hydrogen bond forming OH groups remain rather rigid compared to the hydrogens bonded to the carbon skeleton.