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@ARTICLE{Zinn:825204,
author = {Zinn, Thomas and Willner, Lutz and Lund, Reidar},
title = {{T}elechelic {P}olymer {H}ydrogels: {R}elation between the
{M}icroscopic {D}ynamics and {M}acroscopic {V}iscoelastic
{R}esponse},
journal = {ACS Macro Letters},
volume = {5},
number = {12},
issn = {2161-1653},
address = {Washington, DC},
publisher = {ACS},
reportid = {FZJ-2016-07675},
pages = {1353 - 1356},
year = {2016},
abstract = {Telechelic polymers, that is, hydrophilic polymers with
hydrophobic end-groups, spontaneously form hydrogels
consisting of interconnected micelles. Here we investigate
the relation between the microscopic dynamics determining
the connectivity, that is, the lifetime of the physical
bonds and the resulting rheological properties. This is
achieved by quantitatively relating the chain exchange
kinetics measured by time-resolved small-angle neutron
scattering (TR-SANS) and the mechanical response obtained
from linear oscillatory shear measurements. The results show
that the characteristic relaxation time obtained from
rheology coincides exactly with TR-SANS at intermediate
concentrations. The activation energy, Ea, is
concentration-independent and remain exactly the same as for
TR-SANS. Upon crossing the melting point, a discrete change
in activation energy is observed showing the contribution
from the enthalpy of fusion to the release/debridging
process. The results clearly show that the mechanical
response and connectivity indeed are controlled by molecular
exchange processes. The relaxation time at the lowest
concentration is found to be faster in rheology as compared
to TR-SANS, which can be quantitatively attributed to
entropic forces arising from conformational deformation of
bridging chains.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000390621100011},
doi = {10.1021/acsmacrolett.6b00824},
url = {https://juser.fz-juelich.de/record/825204},
}