Multiple mechanical relaxations in ethylcyclohexane above the glass transition temperature.
The mechanical response of ethylcyclohexane has been investigated at ultrasonic frequencies in a large temperature range from 300 K down to the glass transition region. The results indicate the existence of a secondary relaxation not yet reported for this system. The comparison with literature data leads to a rather complex dynamic behavior. In fact, this molecular liquid exhibits three different mechanical relaxations above the glass transition temperature: a main structural process and two additional processes, both having a possible intramolecular origin.
Mandanici
Andrea
A
Dipartimento di Fisica, Università di Messina, Salita Sperone 31, 98100 Messina, Italy. andrea.mandanici@unime.it
Cutroni
Maria
M