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@ARTICLE{Salzinger:201063,
author = {Salzinger, Stephan and Huber, Stephan and Jaksch, Sebastian
and Busch, Peter and Jordan, Rainer and Papadakis, Christine
M.},
title = {{A}ggregation behavior of thermo-responsive
poly(2-oxazoline)s at the cloud point investigated by {FCS}
and {SANS}},
journal = {Colloid $\&$ polymer science},
volume = {290},
number = {5},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2015-03373},
pages = {385 - 400},
year = {2012},
abstract = {We have studied different thermo-responsive
poly(2-oxazoline)s with iso-propyl (iPrOx) and n-propyl
(nPrOx) pendant groups in aqueous solutions, where they
exhibit lower critical solution temperature behavior. This
paper focuses on the effect of the degree of polymerization,
n, the concentration, c, in the dilute regime, and the
presence of hydrophobic moieties. The cloud points were
investigated as a function of the degree of polymerization,
n, and of the polymer concentration, c. The aggregation
behavior near the cloud point was studied by
temperature-resolved small-angle neutron scattering and
fluorescence correlation spectroscopy, i.e., a combination
of ensemble and single molecule methods. We found that at
the cloud points, large aggregates are formed and that the
cloud points depend strongly on both, n and c. Diblock
copolymers from iPrOx and nPrOx form large aggregates
already at the cloud point of PnPrOx, and, unexpectedly, no
micelles are observed between the cloud points of the two
blocks. Gradient copolymers from iPrOx and
n-nonyl-2-oxazoline (NOx) display a complex aggregation
behavior resulting from the interplay between intra- and
intermolecular association mediated by the hydrophobic NOx
blocks. Above the cloud point, an intermediate temperature
regime with a width of a few Kelvin was found with small but
stable polymer aggregates. Only at higher temperatures,
larger aggregates are found in significant number.},
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 = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000303510500001},
doi = {10.1007/s00396-011-2564-z},
url = {https://juser.fz-juelich.de/record/201063},
}