Relaxational and vibrational dynamics of poly(propylene glycol)

Bergman, Rikard; Svanberg, Christer; Andersson, Daniel; Brodin, A.; Torell, L. M.

doi:10.1016/s0022-3093(98)00638-3

Cited by 34 publications

(22 citation statements)

References 13 publications

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“…Different techniques were used for characterization, among them neutron [15] and light scattering [16][17][18][19][20][21], optical Kerr-effect [22] as well as photothermal [23] and dielectric spectroscopy [3,[24][25][26][27][28][29][30][31] including elaborated studies at elevated pressure [27][28][29][30]. Moreover, different models were applied to the experimental data, especially the coupling model [12,13,32], the minimal model [33,34], a non-monotonic relaxation kinetic model [35] and an approach considering the hybridization of a slower unresolved JG b-with a faster c-relaxation [36].…”

Section: Introductionmentioning

confidence: 99%

Glassy dynamics in mono-, di- and tri-propylene glycol: From the α- to the fast β-relaxation

Köhler

Lunkenheimer

Goncharov

et al. 2010

Journal of Non-Crystalline Solids

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a b s t r a c tWe present a thorough characterization of the glassy dynamics of three propylene glycols (mono-, di-and trimer) by broadband dielectric spectroscopy. By covering a frequency range of more than 15 decades, we have access to the entire variety of dynamic processes typical for glassy dynamics. These results add three more molecular glass formers to the sparse list of materials for which real broadband spectra, including the region of the fast b-process, are available. Some first analyses of the various observed dynamic processes are provided.

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Section: Introductionmentioning

confidence: 99%

Glassy dynamics in mono-, di- and tri-propylene glycol: From the α- to the fast β-relaxation

Köhler

Lunkenheimer

Goncharov

et al. 2010

Journal of Non-Crystalline Solids

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“…The monomer, dimer, and trimer can be regarded as monodisperse, while for the higher M sample n corresponds to the peak molecular weight. We have further included the hydroxyl capped polymer, polypropylene glycol, with M 4000 (n ' 69) as a good approximation of the polymeric behavior for the dimethyl ethers, since the influence of the end groups is marginal at such high M [18][19][20]. The samples will in the following be termed monomer, dimer, trimer, heptamer, and polymer, respectively.…”

mentioning

confidence: 99%

Chain-Length-Dependent Relaxation Scenarios in an Oligomeric Glass-Forming System: From Merged to Well-SeparatedαandβLoss Peaks

Mattsson

Bergman²,

Jacobsson³

et al. 2003

Phys. Rev. Lett.

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We have studied the relaxation dynamics of a homologous series of propylene glycol based dimethyl ethers in the supercooled regime by means of broadband dielectric spectroscopy. The system is chosen in order to minimize changes of the intermolecular interactions with varying molecular weight, M. A gradual transformation from a scenario of well-separated to one of merged alpha and beta loss peaks was observed with decreasing M. The results give strong evidence for the currently debated excess wing being due to an underlying beta relaxation. The study suggests that the main difference between glass formers with and without excess wings is the relaxation time at the merging temperature.

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“…Thus φ(R) corresponds to a long-range angular distortion of a polymer chain, while φ(r) corresponds to a dynamical interchain interaction on the monomer length scale. Incidentally, the crossover between the two length scales has been observed between propyl glycol (PG) and polypropyl glycol (PPG) [2,75].…”

Section: Anomalous Diffusionmentioning

confidence: 99%

“…distributions [75], with range 1.5 ≤ γ ≤ 3. This range is topologically suggestive of fd, with d = 3 and 1/2 ≤ f ≤ 1; the short-and long-range interaction model may also be applicable to power-law scaling.…”

Section: Conclusion and Postscriptsmentioning

confidence: 99%

Microscopic aspects of Stretched Exponential Relaxation (SER) in homogeneous molecular and network glasses and polymers

Phillips¹

2011

Journal of Non-Crystalline Solids

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a b s t r a c tThe "diffusion to traps" model quantitatively explains "magic" stretching fractions β(Tg) for a wide variety of relaxation experiments (nearly 50 altogether) on microscopically homogeneous electronic and molecular glasses and deeply supercooled liquids by assuming that quasi-particle excitations indexed by Breit-Wigner channels diffuse to randomly distributed sinks. Here the theme of earlier reviews, based on the observation that in the presence of short-range forces only d* = d = 3 is the actual spatial dimensionality, while for mixed short-and long-range forces, d* = fd = d/2, is applied to four new spectacular examples, where it turns out that SER is useful not only for purposes of quality control, but also for defining what is meant by a glass in novel contexts. The examples are three relaxation experiments that used different probes on different materials: luminescence in isoelectronic crystalline Zn(Se,Te) alloys, fibrous relaxation in orthoterphenyl (OTP) and related glasses and supercooled melts up to 1.15T g , and relaxation of binary chalcogen melts probed by spin-polarized neutrons (T as high as 1.5T g ). The model also explains quantitatively the appearance of SER in a fourth "sociological" example, distributions of 600 million 20th century natural science citations, and the remarkable appearance of the same "magic" values of β = 3/5 and 3/7 seen in glasses.

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Relaxational and vibrational dynamics of poly(propylene glycol)

Cited by 34 publications

References 13 publications

Glassy dynamics in mono-, di- and tri-propylene glycol: From the α- to the fast β-relaxation

Glassy dynamics in mono-, di- and tri-propylene glycol: From the α- to the fast β-relaxation

Chain-Length-Dependent Relaxation Scenarios in an Oligomeric Glass-Forming System: From Merged to Well-SeparatedαandβLoss Peaks

Microscopic aspects of Stretched Exponential Relaxation (SER) in homogeneous molecular and network glasses and polymers

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