001     155453
005     20240619092100.0
024 7 _ |a 10.1007/s00396-014-3280-2
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024 7 _ |a 1435-1536
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024 7 _ |a 0023-2904
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024 7 _ |a 0368-6590
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024 7 _ |a 0303-402X
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024 7 _ |a WOS:000339888900015
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037 _ _ |a FZJ-2014-04619
082 _ _ |a 540
100 1 _ |a Chua, Yeong Zen
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245 _ _ |a Glass transition cooperativity from broad band heat capacity spectroscopy
260 _ _ |a Berlin
|c 2014
|b Springer
336 7 _ |a Journal Article
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520 _ _ |a Molecular dynamics is often studied by broad band dielectric spectroscopy (BDS) because of the wide dynamic range available and the large number of processes resulting in electrical dipole fluctuations and with that in a dielectrically detectable relaxation process. Calorimetry on the other hand is an effective analytical tool to characterize phase and glass transitions by its signatures in heat capacity. In the linear response scheme, heat capacity is considered as entropy compliance. Consequently, only processes significantly contributing to entropy fluctuations appear in calorimetric curves. The glass relaxation is a prominent example for such a process. Here, we present complex heat capacity at the dynamic glass transition (segmental relaxation) of polystyrene (PS) and poly(methyl methacrylate) (PMMA) in a dynamic range of 11 orders of magnitude, which is comparable to BDS. As one of the results, we determined the characteristic length scale of the corresponding fluctuations. The dynamic glass transition measured by calorimetry is finally compared to the cooling rate dependence of fictive temperature and BDS data. For PS, dielectric and calorimetric data are similar but for PMMA with its very strong secondary relaxation process some peculiarities are observed.
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588 _ _ |a Dataset connected to CrossRef, juser.fz-juelich.de
700 1 _ |a Schulz, Gunnar
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700 1 _ |a Shoifet, Evgeni
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700 1 _ |a Huth, Heiko
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700 1 _ |a Zorn, Reiner
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700 1 _ |a Scmelzer, Jürn W. P.
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700 1 _ |a Schick, Christoph
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773 _ _ |a 10.1007/s00396-014-3280-2
|g Vol. 292, no. 8, p. 1893 - 1904
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|n 8
|p 1893 - 1904
|t Colloid & polymer science
|v 292
|y 2014
|x 1435-1536
856 4 _ |u https://juser.fz-juelich.de/record/155453/files/FZJ-2014-04619.pdf
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|v Functional Macromolecules and Complexes
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914 1 _ |y 2014
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