title: Additive property of secondary relaxation processes in di-n-octyl and di-isooctyl phthalates: signature of non-Johari-Goldstein relaxation.
abstract: Broadband dielectric spectroscopy was used to study relaxation dynamics of supercooled di-n-octyl phthalate, di-isooctyl phthalate, and their mixtures. Additionally, low temperature measurements were performed to investigate the nature of the secondary relaxation processes in both glass formers. The authors found that the secondary relaxation observed in the mixture is the additive sum of the secondary relaxations of the two components. This experimental evidence indicates that these secondary relaxation processes are intramolecular in origin, and they are non-Johari-Goldstein secondary relaxations.
authors.affiliation: Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Kaminska
authors.forename: Kamil
authors.initials: K
authors.lastname: Kaminski
authors.forename: Marian
authors.initials: M
authors.lastname: Paluch
authors.forename: Jerzy
authors.initials: J
authors.lastname: Ziolo
authors.forename: K L
authors.initials: KL
authors.lastname: Ngai