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@ARTICLE{Chua:155453,
author = {Chua, Yeong Zen and Schulz, Gunnar and Shoifet, Evgeni and
Huth, Heiko and Zorn, Reiner and Scmelzer, Jürn W. P. and
Schick, Christoph},
title = {{G}lass transition cooperativity from broad band heat
capacity spectroscopy},
journal = {Colloid $\&$ polymer science},
volume = {292},
number = {8},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2014-04619},
pages = {1893 - 1904},
year = {2014},
abstract = {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.},
cin = {ICS-1 / Neutronenstreuung ; JCNS-1},
ddc = {540},
cid = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106},
pnm = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
(POF2-54G24)},
pid = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000339888900015},
doi = {10.1007/s00396-014-3280-2},
url = {https://juser.fz-juelich.de/record/155453},
}