Dynamics of glassy and liquid m-toluidine investigated by high-resolution dielectric spectroscopy.
The glass-former m-toluidine displays the characteristic properties of a fragile supercooled liquid, which suggest the existence of a slow secondary relaxation process. In view of the recently realized importance of such a secondary relaxation feature, we have conducted a dielectric search for the secondary process in viscous and glassy m-toluidine. Based on high-resolution experiments on the distilled liquid, a secondary process can be identified which has the properties typical of a Johari-Goldstein beta relaxation. As a result, the previous hypothesis that the methyl group might be responsible for suppressing the secondary dynamics in glassy m-toluidine no longer holds.
Mandanici
Andrea
A
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA.
Cutroni
Maria
M
Richert
Ranko
R