Peculiar Behavior of the Secondary Dielectric Relaxation in Propylene Glycol Oligomers near the Glass Transition

2008 ◽  
Author(s):  
K. Grzybowska ◽  
A. Grzybowski ◽  
M. Paluch ◽  
Michio Tokuyama ◽  
Irwin Oppenheim ◽  
...  
Keyword(s):  
Glass Transition ◽  
Dielectric Relaxation ◽  
Propylene Glycol ◽  
Peculiar Behavior ◽  
Glycol Oligomers

Influence of Molecular Characteristics on Dielectric Relaxation of Propylene Glycol Oligomers

2001 ◽  
Vol 169 (1) ◽  
pp. 147-156
Author(s):  
Daniele Prevosto ◽  
Simone Capaccioli ◽  
Mauro Lucchesi ◽  
Pierangelo Rolla
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol ◽  
Molecular Characteristics ◽  
Glycol Oligomers

scholarly journals Segmental- and normal-mode dielectric relaxation of poly(propylene glycol) under pressure

2003 ◽  
Vol 41 (23) ◽  
pp. 3047-3052 ◽  
Author(s):  
C. M. Roland ◽  
T. Psurek ◽  
S. Pawlus ◽  
M. Paluch
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol ◽  
Normal Mode ◽  
Poly Propylene

scholarly journals Using Dielectric Relaxation Spectroscopy to Characterize the Glass Transition and Onset of Crystallinity of Skim-Milk Powder

2018 ◽  
Author(s):  
Martin G. Buehler
Keyword(s):  
Glass Transition ◽  
Shelf Life ◽  
Dielectric Relaxation ◽  
Loss Tangent ◽  
Milk Powder ◽  
Skim Milk ◽  
Skim Milk Powder ◽  
Dielectric Relaxation Spectroscopy ◽  
Scanning Calorimetry ◽  
Boundary Curves

This paper describes the dielectric relaxation spectroscopy (DRS) method for obtaining glass transition temperature and the onset of crystallinity of skim milk powder (SMP). The methodology consists of exposing SMP samples to numerous constant temperatures, T, and water activities, aw, and measuring the relaxation time. Measurements are based on changes in the loss-tangent height at its peak frequency. Glass transition times are identified at peaks in the loss-tangent height versus time curve and the onset of crystallinity times are identified when the loss-tangent height collapses. The analysis leads to two boundary curves: glass transition Tg, aw curve and the onset of crystallinity Tc, aw curve. They separate the SMP stable (long shelf life) and unstable (short shelf life) regions. Two curve fitting algorithms were developed for (a) aw2, tg curve where tg is the time to glass transition and aw2, tc curve where time tc is the time to onset of crystallinity and (b) Tg, aw and Tc, aw boundary curves. Finally, the DRS data are compared to differential scanning calorimetry (DSC) results.

Dielectric Relaxation in Glycerol, Propylene Glycol, andn‐Propanol

1951 ◽  
Vol 19 (12) ◽  
pp. 1484-1490 ◽  
Author(s):  
D. W. Davidson ◽  
R. H. Cole
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol

Phenomenological relationship between dielectric relaxation and thermodynamic recovery processes near the glass transition

1985 ◽  
Vol 18 (12) ◽  
pp. 2652-2663 ◽  
Author(s):  
S. Matsuoka ◽  
G. Williams ◽  
G. E. Johnson ◽  
E. W. Anderson ◽  
T. Furukawa
Keyword(s):  
Glass Transition ◽  
Dielectric Relaxation ◽  
Recovery Processes
Sign in / Sign up

Export Citation Format

Share Document