title: Glassy dynamics and physical aging in fucose saccharides as studied by infrared- and broadband dielectric spectroscopy.
abstract: Fourier Transform Infra Red (FTIR) and Broadband Dielectric Spectroscopy (BDS) are combined to study both the intra- and inter-molecular dynamics of two isomers of glass forming fucose, far below and above the calorimetric glass transition temperature, T(g). It is shown that the various IR-active vibrations exhibit in their spectral position and oscillator strength quite different temperature dependencies, proving their specific signature in the course of densification and glass formation. The coupling between intra- and inter molecular dynamics is exemplified by distinct changes in IR active ring vibrations far above the calorimetric glass transition temperature at about 1.16T(g), where the dynamic glass transition (α relaxation) and the secondary β relaxation merge. For physically annealed samples it is demonstrated that upon aging the different moieties show characteristic features as well, proving the necessity of atomistic descriptions beyond coarse-grained models.
authors.affiliation: Institute of Experimental Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany. wilhelm.kossack@physik.uni-leipzig.de.
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Kossack
authors.forename: Karolina
authors.initials: K
authors.lastname: Adrjanowicz
authors.forename: Magdalena
authors.initials: M
authors.lastname: Tarnacka
authors.forename: Wycliffe Kiprop
authors.initials: WK
authors.lastname: Kipnusu
authors.forename: Mateusz
authors.initials: M
authors.lastname: Dulski
authors.forename: Emmanuel Urandu
authors.initials: EU
authors.lastname: Mapesa
authors.forename: Kamil
authors.initials: K
authors.lastname: Kaminski
authors.forename: Sebastian
authors.initials: S
authors.lastname: Pawlus
authors.forename: Marian
authors.initials: M
authors.lastname: Paluch
authors.forename: Friedrich
authors.initials: F
authors.lastname: Kremer
mesh_terms: D058266:Dielectric Spectroscopy; D005643:Fucose / Q000737:chemistry*; D006860:Hydrogen Bonding; D007536:Isomerism; D056004:Molecular Dynamics Simulation; D044367:Phase Transition; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D044366:Transition Temperature
chemical_list: D005643:Fucose