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@ARTICLE{Zinn:155366,
author = {Zinn, Thomas and Willner, Lutz and Lund, Reidar and Pipich,
Vitaliy and Appavou, Marie-Sousai and Richter, Dieter},
title = {{S}urfactant or block copolymer micelles? {S}tructural
properties of a series of well-defined n-alkyl–{PEO}
micelles in water studied by {SANS}},
journal = {Soft matter},
volume = {10},
number = {28},
issn = {1744-6848},
address = {Cambridge},
publisher = {Royal Society of Chemistry (RSC)},
reportid = {FZJ-2014-04535},
pages = {5212},
year = {2014},
abstract = {Here we present an extensive small-angle neutron scattering
(SANS) structural characterization of micelles formed by
poly(ethylene oxide)-mono-n-alkyl ethers (Cn–PEOx) in
dilute aqueous solution. Chemically, Cn–PEOx can be
considered as a hybrid between a low-molecular weight
surfactant and an amphiphilic block copolymer. The present
system, prepared through anionic polymerization techniques,
is better defined than other commercially available polymers
and allows a very precise and systematic testing of the
theoretical predictions from thermodynamical models. The
equilibrium micellar properties were elaborated by
systematically varying the n-alkyl chain length (n) at
constant PEO molecular weight or increasing the soluble
block size (x), respectively. The structure was reminiscent
of typical spherical star-like micelles i.e. a constant core
density profile, [similar]r0, and a diffuse corona density
profile, [similar]r−4/3. Through a careful quantitative
analysis of the scattering data, it is found that the
aggregation number, Nagg initially rapidly decreases with
increasing PEO length until it becomes independent at higher
PEO molecular weight as expected for star-like micelles. On
the other hand, the dependency on the n-alkyl length is
significantly stronger than that expected from the theories
for star-like block copolymer micelles, Nagg [similar] n2
similar to what is expected for surfactant micelles. Hence
the observed aggregation behavior suggests that the
Cn–PEOx micelles exhibit a behavior that can be considered
as a hybrid between low-molecular weight surfactant micelles
and diblock copolymer micelles.},
cin = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS (München) ;
Jülich Centre for Neutron Science JCNS (München) ;
JCNS-FRM-II},
ddc = {530},
cid = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
(POF2-54G24)},
pid = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000338644400019},
doi = {10.1039/c4sm00625a},
url = {https://juser.fz-juelich.de/record/155366},
}