Verifying the Approximate Coinvariance of the α and Johari-Goldstein β Relaxation Times to Variations of Pressure and Temperature in Polyisoprene
Sign Up to like & getrecommendations! Published in 2018 at "Macromolecules"
DOI: 10.1021/acs.macromol.8b00811
Abstract: From dielectric spectroscopy measurements on polyisoprene performed at ambient and elevated pressures, we show that the secondary relaxation has properties of the supposedly universal Johari–Goldstein β-relaxation. These properties include approximate (i.e., in order of magnitude… read more here.
Keywords: johari goldstein; relaxation; goldstein relaxation; approximate coinvariance ... See more keywords
Clarifying the nature of the Johari-Goldstein β-relaxation and emphasising its fundamental importance
Sign Up to like & getrecommendations! Published in 2020 at "Philosophical Magazine"
DOI: 10.1080/14786435.2020.1781276
Abstract: ABSTRACT Since 1998 the primitive relaxation time τ 0(T,P) of the Coupling Model (CM) and the Johari-Goldstein (JG) β-relaxation time τJG (T,P) are shown approximately equal in many glass-formers. The CM relation between τ 0(T,P)… read more here.
Keywords: johari goldstein; relaxation time; relaxation; goldstein relaxation ... See more keywords
Microscopic observation of hidden Johari-Goldstein-β process in glycerol.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.105.l012605
Abstract: The Johari-Goldstein-β (JG-β) process is widely observed in a variety of glass-forming systems and recognized as an intrinsic process in deeply supercooled and glassy states. However, in some systems, e.g., glycerol, a clear sign of… read more here.
Keywords: goldstein process; process glycerol; process; johari goldstein ... See more keywords
Structural rearrangements governing Johari-Goldstein relaxations in metallic glasses
Sign Up to like & getrecommendations! Published in 2017 at "Science Advances"
DOI: 10.1126/sciadv.1701577
Abstract: Atomistic simulations reveal that secondary relaxations in metallic glasses originate from string-like atomic motions. The Johari-Goldstein secondary (β) relaxations are an intrinsic feature of supercooled liquids and glasses. They are crucial to many properties of… read more here.
Keywords: johari goldstein; relaxations metallic; structural rearrangements; metallic glasses ... See more keywords
Drug-Biopolymer Dispersions: Morphology- and Temperature- Dependent (Anti)Plasticizer Effect of the Drug and Component-Specific Johari–Goldstein Relaxations
Sign Up to like & getrecommendations! Published in 2022 at "International Journal of Molecular Sciences"
DOI: 10.3390/ijms23052456
Abstract: Amorphous molecule-macromolecule mixtures are ubiquitous in polymer technology and are one of the most studied routes for the development of amorphous drug formulations. For these applications it is crucial to understand how the preparation method… read more here.
Keywords: structural relaxation; johari goldstein; fully amorphous; drug ... See more keywords
Fractional Coupling of Primary and Johari–Goldstein Relaxations in a Model Polymer
Sign Up to like & getrecommendations! Published in 2022 at "Polymers"
DOI: 10.3390/polym14245560
Abstract: A polymer model exhibiting heterogeneous Johari–Goldstein (JG) secondary relaxation is studied by extensive molecular-dynamics simulations of states with different temperature and pressure. Time–temperature–pressure superposition of the primary (segmental) relaxation is evidenced. The time scales of… read more here.
Keywords: coupling primary; relaxation; johari goldstein; johari ... See more keywords