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@ARTICLE{Adelsberger:280652,
author = {Adelsberger, Joseph and Bivigou-Koumba, Achille M. and
Miasnikova, Anna and Busch, Peter and Laschewsky, André and
Müller-Buschbaum, Peter and Papadakis, Christine M.},
title = {{P}olystyrene-block-poly (methoxy diethylene glycol
acrylate)-block-polystyrene triblock copolymers in aqueous
solution—a {SANS} study of the temperature-induced
switching behavior},
journal = {Colloid $\&$ polymer science},
volume = {293},
number = {5},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2016-00416},
pages = {1515 - 1523},
year = {2015},
note = {FINAL DRAFT POST REFEREE wird nicht zur Verfügung
gestellt. Mic, 15.01.2016},
abstract = {A concentrated solution of a symmetric triblock copolymer
with a thermoresponsive poly(methoxy diethylene glycol
acrylate) (PMDEGA) middle block and short hydrophobic, fully
deuterated polystyrene end blocks is investigated in D2O
where it undergoes a lower critical solution
temperature-type phase transition at ca. 36 °C. Small-angle
neutron scattering (SANS) in a wide temperature range
(15–50 °C) is used to characterize the size and inner
structure of the micelles as well as the correlation between
the micelles and the formation of aggregates by the micelles
above the cloud point (CP). A model featuring spherical
core-shell micelles, which are correlated by a hard-sphere
potential or a sticky hard-sphere potential together with a
Guinier form factor describing aggregates formed by the
micelles above the CP, fits the SANS curves well in the
entire temperature range. The thickness of the
thermoresponsive micellar PMDEGA shell as well as the
hard-sphere radius increase slightly already below the cloud
point. Whereas the thickness of the thermoresponsive
micellar shell hardly shrinks when heating through the CP
and up to 50 °C, the hard-sphere radius decreases within
3.5 K at the CP. The volume fraction decreases already
significantly below the CP, which may be at the origin of
the previously observed gel–sol transition far below the
CP (Miasnikova et al., Langmuir 28: 4479–4490, 2012).
Above the CP, small, and at higher temperatures, large
aggregates are formed by the micelles.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218},
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:000353348000021},
doi = {10.1007/s00396-015-3535-6},
url = {https://juser.fz-juelich.de/record/280652},
}