The Scaling of the Dynamics of Glasses and Supercooled Liquids

Kremer, Friedrich; Schönhals, Andreas

doi:10.1007/978-3-642-56120-7_4

Cited by 178 publications

(348 citation statements)

References 72 publications

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“…The results for the PEGDA/EGMEA and PEGDA/2-HEA series can be described by the VogeleFulchereTammann (VFT) relation (see solid curves in Fig. 10), while the data for PEGDA/DGEEA display a more linear, Arrhenius character [45]. The relative positions of the curves along the reciprocal temperature axis match the trends in T g indicated in Table 1.…”

Section: Glasserubber Relaxationsupporting

confidence: 56%

Dynamic relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks: Influence of short chain pendant groups

Borns

Kalakkunnath

Kalika

et al. 2007

Polymer

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Section: Glasserubber Relaxationsupporting

confidence: 56%

Dynamic relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks: Influence of short chain pendant groups

Borns

Kalakkunnath

Kalika

et al. 2007

Polymer

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“…ε ∞ gives ε′ for f → ∞. The relevant details can be found in reference 32. Examples of this procedure are given in the inset A of Figure 12.…”

Section: Resultsmentioning

confidence: 99%

Structure of Plasma‐Deposited Poly(acrylic acid) Films

Fahmy

Mix

Schönhals

et al. 2011

Plasma Processes & Polymers

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Poly(acrylic acid) films with a thickness of about 150 nm were deposited using a pulsed plasma onto aluminum and glass. The structure/property relationships of these samples were studied in dependence to the duty cycle (DC) of the plasma by a broad combination of different techniques and probes. For the first time, volume sensitive methods (FTIR, dielectric spectroscopy, and differential scanning calorimetry) are combined with surface analyses i.e. XPS. For an unambiguous identification of COOH groups by XPS, derivatization with trifluoroethanol was accomplished. Quantitative FTIR investigations give qualitatively a dependence of the concentration of COOH groups upon DC similar to that given by XPS investigations. The observed differences are discussed considering the different analytical depths of both methods. The dielectric measurements reveal that the structure of the plasma deposited films is different from that of the bulk material. Moreover, these measurements show also that the plasma deposited films are not thermally stable but undergo a post plasma chemical reaction during heating, where the reaction kinetics depends on DC.

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“…53 Dielectric measurements show that above this frequency deviations of the VFTH behavior appear. 54 In the context of this work the conditions of the thermo-rheological simplicity seem to hold in the frequency range of interest. This means that the assumption δq = constant is fulfilled for PS in the range of investigation but it is not a requirement for the further discussion.…”

Section: A the Width Of The Dynamic Glass Transitionmentioning

confidence: 96%

Vitrification in a wide cooling rate range: The relations between cooling rate, relaxation time, transition width, and fragility

Schawe

2014

The Journal of Chemical Physics

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The cooling rate dependence of the thermal glass transition of polystyrene (PS) is measured in a range between 0.2 K/min (0.003 K/s) and 4000 K/s using conventional differential scanning calorimetry (DSC) and Fast Scanning Calorimetry (Flash DSC 1). The cooling rate dependence of the thermal glass transition can be described in an analogy to the frequency dependence of the dynamic glass transition. The relation between cooling rate, β(c), and frequency, ω, is usually described by the Frenkel-Kobeko-Reiner-(FKR) hypothesis β(c)/ω = C, where C is a constant. We have introduced a new property to describe the kinetics of the vitrification process; the vitrification function, κ. This function is the ratio between the width of the thermal and dynamic glass transition. The validity of the FKR hypothesis is analyzed by two independent methods, the analysis of the activation diagram using the Vogel-Fulcher-Tammann-Hesse equation and the analysis of the temperature dependence of the transition width. We derived a relation for the FKR-constant, which indicates the validity range of the FKR hypotheses. This hypothesis is valid if the logarithmic width of the vitrified and the non-vitrified relaxation spectrum is temperature invariant. This condition is fulfilled for polystyrene in the measured cooling rate range. Furthermore we discuss the relation between the vitrification function, the transition width, the FKR constant, and the fragility.

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The Scaling of the Dynamics of Glasses and Supercooled Liquids

Cited by 178 publications

References 72 publications

Dynamic relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks: Influence of short chain pendant groups

Dynamic relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks: Influence of short chain pendant groups

Structure of Plasma‐Deposited Poly(acrylic acid) Films

Vitrification in a wide cooling rate range: The relations between cooling rate, relaxation time, transition width, and fragility

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