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@ARTICLE{Gold:839990,
author = {Gold, Barbara and Hövelmann, Claas and Lühmann, N. and
Pyckhout-Hintzen, W. and Wischnewski, A. and Richter, D.},
title = {{T}he microscopic origin of the rheology in supramolecular
entangled polymer networks},
journal = {Journal of rheology},
volume = {61},
number = {6},
issn = {1520-8516},
address = {Melville, NY [u.a.]},
publisher = {Inst.},
reportid = {FZJ-2017-07560},
pages = {1211 - 1226},
year = {2017},
abstract = {Supramolecular groups in polymeric systems lead to
responsive materials which are ideally suited for
applications in dynamic environments. The key to their
advanced properties such as shape-memory or self-healing is
the reversibility of secondary interactions which can be
triggered by external stimuli such as temperature, light, or
pH-value. Controlling the (mechanical) behavior of such
systems requires a precise understanding of intrinsic
properties. We present a multimethod study of transient
polyisoprene networks that were functionalized with
different amounts of hydrogen bonding urazole groups. This
work aims at understanding rich rheological features on the
basis of their microscopic origin. First, the
thermorheological simple behavior is validated
experimentally. Subsequently, we characterize the underlying
microscopic processes by broadband dielectric spectroscopy
(α-process and α∗-process), differential scanning
calorimetry (glass transition behavior), and
Fourier-transform infrared spectroscopy (thermodynamics of
group association/dissociation). Based on these results, the
influence of the supramolecular groups on the rheological
response is analyzed. The observed features such as the
onset of elastomeric properties in the flow regime, a
drastic increase in the chain relaxation time with an
increasing amount of functional groups, and the occurrence
of a second rheological relaxation process, which is the
most prominent effect, are discussed and related to their
physical origin.},
cin = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-2},
ddc = {530},
cid = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)JCNS-2-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551) /
6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
G:(DE-HGF)POF3-6215},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000414273200016},
doi = {10.1122/1.4998159},
url = {https://juser.fz-juelich.de/record/839990},
}