Schönhals, Kremer, and Stickel reply

Schönhals, Andreas; Kremer, Friedrich; Stickel, F.

doi:10.1103/physrevlett.71.4096

Cited by 33 publications

(30 citation statements)

References 9 publications

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“…4, the latter indicating that PPG is a glass former of intermediate fragility. The fit gives however a somewhat low value for the preexponent, 0 ϭ10 Ϫ15.2 s. High-quality dielectric data for the ␣-relaxation times are best fit using Dϭ6.7 and T 0 ϭ165 K. 31 Thus, the dielectric data differ significantly from the present light scattering data, in particular in the high-temperature range. Similar findings have been observed in other glass formers.…”

Section: Of Ref 21͒mentioning

confidence: 61%

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Dynamics around the liquid-glass transition in poly(propylene-glycol) investigated by wide-frequency-range light-scattering techniques

et al. 1997

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The structural dynamics of poly͑propylene-glycol͒ of molecular weight M W ϭ4000 have been investigated over a large temperature range 10-375 K and in a wide dynamical window, corresponding to 10 Ϫ3 -10 14 Hz, using various light-scattering techniques. The slow dynamics were investigated using a wide time-range photon-correlation spectroscopy; for the faster dynamics a combination of interferometric and grating spectrometer techniques were used. We observe four distinguishable kinds of dynamics; ͑i͒ slow normal-mode dynamics, ͑ii͒ the main (␣) relaxation which is related to the viscosity, ͑iii͒ a faster ͑␤͒ relaxation, and ͑iv͒ a low-frequency vibrational peak. The data are discussed in relation to the mode-coupling theory ͑MCT͒ for the liquid-glass transition. Surprisingly, the slow dynamics observed using the PCS technique close to the glass transition temperature T g are found to be in good agreement with predictions of MCT and a T c ϭ236 K can be extracted. In contrast, the high-frequency data taken above T c are not consistent with MCT. In this range a strong vibrational peak, the so-called boson peak, seriously affects the relaxational spectrum and simple MCT analysis cannot be applied. This finding is in agreement with recent light-and neutron-scattering investigations of other hydrogen-bonded intermediate glass formers and also strong covalently bonded systems.

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Section: Of Ref 21͒mentioning

confidence: 61%

“…For comparison we include in Fig. 4 data for the average relaxation time reported for the ␣ process from dielectric measurements 30,31 and from Brillouin 32 and impulsive stimulated light scattering ͑ISS͒ spectroscopy. 33 As can be seen in Fig.…”

Section: A Time Domain Results "Pcs…mentioning

confidence: 99%

Dynamics around the liquid-glass transition in poly(propylene-glycol) investigated by wide-frequency-range light-scattering techniques

et al. 1997

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“…[13] The same behavior is also found for a liquid crystalline polysiloxane. [38] It could be further shown that the ratio of this temperature where the temperature dependence of the a-relaxation changes to the glass transition temperature has for all investigated systems a approximately a constant value. [13,38] The inset of Figure 7 gives also the derivative [d log f p /d T] -1/2 for the drelaxation.…”

Section: Resultsmentioning

confidence: 99%

“…[38] It could be further shown that the ratio of this temperature where the temperature dependence of the a-relaxation changes to the glass transition temperature has for all investigated systems a approximately a constant value. [13,38] The inset of Figure 7 gives also the derivative [d log f p /d T] -1/2 for the drelaxation. In contradiction to the behavior observed for It turns out from Figure 4 that the relaxation rates of the a-and of the d-process merge close to T g approximately at 1 000 K/T = 3.05 (T = 328 K).…”

Section: Resultsmentioning

confidence: 99%

Comparison of the Molecular Dynamics of a Liquid Crystalline Side Group Polymer Revealed from Temperature Modulated DSC and Dielectric Experiments in the Glass Transition Region

Schick

Sukhorukov

Schönhals³

2001

Macromol. Chem. Phys.

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“…In recent years, a variety of novel approaches to the glass transition, both theoretical and phenomenological (e.g. [1,2]), stimulated new experimental investigations especially of the high-frequency dynamics of glass-forming liquids (e.g., [3][4][5][6][7][8][9][10][11][12]). Among these, the mode coupling theory (MCT) [1] is currently most controversially discussed, explaining the glass transition in terms of a dynamic phase transition at a critical temperature T c significantly above the glass temperature T g .…”

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confidence: 99%

Wide range dielectric spectroscopy on glass-forming materials: An experimental overview

et al. 2001

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Dielectric spectroscopy is one of the most commonly used techniques for the investigation of the dynamic response of glassforming materials. The tremendous slow-down of the particle motions when approaching the glass transition and especially the fast processes in glass-forming materials, which have come into the focus of scientific interest recently, make the investigation in a wide frequency range highly desirable. Recently, results from broadband dielectric spectroscopy on glass-forming materials in their liquid and supercooled-liquid state, covering more than 18 decades of frequency have been reported by our group. In the present paper, we give an overview of the various experimental setups and techniques used to collect these spectra. As an example, spectra of the prototypical glass former glycerol are presented. Keywords broadband dielectric spectroscopy, glassforming liquids, glasses 1 INTRODUCTIONDespite a long history of research, the theoretical explanation of the glass transition is still one of the most challenging tasks of modern

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Schönhals, Kremer, and Stickel reply

Cited by 33 publications

References 9 publications

Dynamics around the liquid-glass transition in poly(propylene-glycol) investigated by wide-frequency-range light-scattering techniques

Dynamics around the liquid-glass transition in poly(propylene-glycol) investigated by wide-frequency-range light-scattering techniques

Comparison of the Molecular Dynamics of a Liquid Crystalline Side Group Polymer Revealed from Temperature Modulated DSC and Dielectric Experiments in the Glass Transition Region

Wide range dielectric spectroscopy on glass-forming materials: An experimental overview

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