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@ARTICLE{Adelsberger:8965,
author = {Adelsberger, J. and Kulkarni, A. and Jain, A. and Wang, W.
and Bivigou-Koumba, A.M. and Busch, P. and Pipich, V. and
Holderer, O. and Hellweg, T. and Laschewsky, A. and
Müller-Buschbaum, P.Ü and Papadakis, C.M.},
title = {{T}hermoresponsive {PS}-b-{PNIPAM}-b-{PS} {M}icelles:
{A}ggregation {B}ehavior, {S}egmental {D}ynamics, and
{T}hermal {R}esponse},
journal = {Macromolecules},
volume = {43},
issn = {0024-9297},
address = {Washington, DC},
publisher = {Soc.},
reportid = {PreJuSER-8965},
pages = {2490 - 2501},
year = {2010},
note = {We thank W. Doster and A.-K. Sommer for assistance with the
DLS experiments and fruitful discussions. We kindly
acknowledge given beam time by the Julich Centre for Neutron
Science at FRM II. This work was supported by the DFG
priority program SPP1259 "Intelligente Hydrogele" (Pa771/4
Mu1487/8, La611/7, He2995/2-2). A.M.B.-K. gratefully
acknowledges a personal grant from Deutscher Akademischer
Austauschdienst (DAAD).},
abstract = {We have studied I lie thermal behavior of amphiphilic,
symmetric triblock copolymers having short, deuterated
polystyrene (PS) end blocks and a large
poly(N-isopropylacrylarnicle) (PNIPAM) middle block
exhibiting a lower critical solution temperature (LCST) in
aqueous solution. A wide range of concentrations (0.1-300
mg/mL) is investigated using it number of analytical methods
such as fluorescence correlation spectroscopy (FCS),
turbidimetry, dynamic light scattering (DLS), small-angle
neutron scattering (SANS), and neutron spin-echo
spectroscopy (NSE). The critical micelle concentration is
determined using FCS to be 1 mu M or less. The collapse of
the micelles at the LCST is investigated using turbidimetry
and DLS and shows a weak dependence on the degree of
polymerization of the PNIPAM block. SANS with contrast
matching allows its to reveal the core-shell Structure of
the micelles as well as their correlation as a function of
temperature. The segmental dynamics of the PNIPAM shell are
studied as a function of temperature and arc found to be
faster in the collapsed state than in the swollen state. The
mode detected has a linear dispersion in q(2) and is found
to be faster in the collapsed state as compared to the
swollen state. We attribute this result to the averaging
over mobile and immobilized segments.},
keywords = {J (WoSType)},
cin = {IFF-4 / Jülich Centre for Neutron Science JCNS (JCNS) ;
JCNS},
ddc = {540},
cid = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)JCNS-20121112},
pnm = {BioSoft: Makromolekulare Systeme und biologische
Informationsverarbeitung},
pid = {G:(DE-Juel1)FUEK505},
experiment = {EXP:(DE-MLZ)J-NSE-20140101 / EXP:(DE-MLZ)KWS2-20140101},
shelfmark = {Polymer Science},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000274928400051},
doi = {10.1021/ma902714p},
url = {https://juser.fz-juelich.de/record/8965},
}