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@ARTICLE{Vishnevetskaya:862744,
author = {Vishnevetskaya, Natalya S. and Hildebrand, Viet and
Nizardo, Noverra M. and Ko, Chia-Hsin and Di, Zhenyu and
Radulescu, Aurel and Barnsley, Lester and Müller-Buschbaum,
Peter and Laschewsky, André and Papadakis, Christine M.},
title = {{A}ll-{I}n-{O}ne “{S}chizophrenic” {S}elf-{A}ssembly of
{O}rthogonally {T}uned {T}hermoresponsive {D}iblock
{C}opolymers},
journal = {Langmuir},
volume = {35},
number = {19},
issn = {1520-5827},
address = {Washington, DC},
publisher = {ACS Publ.},
reportid = {FZJ-2019-02986},
pages = {6441 - 6452},
year = {2019},
abstract = {Smart, fully orthogonal switching was realized in a highly
biocompatible diblock copolymer system with variable
trigger-induced aqueous self-assembly. The polymers are
composed of nonionic and zwitterionic blocks featuring lower
and upper critical solution temperatures (LCSTs and UCSTs).
In the system investigated, diblock copolymers from
poly(N-isopropyl methacrylamide) (PNIPMAM) and a
poly(sulfobetaine methacrylamide), systematic variation of
the molar mass of the latter block allowed for shifting the
UCST of the latter above the LCST of the PNIPMAM block in a
salt-free condition. Thus, successive thermal switching
results in “schizophrenic” micellization, in which the
roles of the hydrophobic core block and the hydrophilic
shell block are interchanged depending on the temperature.
Furthermore, by virtue of the strong electrolyte-sensitivity
of the zwitterionic polysulfobetaine block, we succeeded to
shift its UCST below the LCST of the PNIPMAM block by adding
small amounts of an electrolyte, thus inverting the pathway
of switching. This superimposed orthogonal switching by
electrolyte addition enabled us to control the switching
scenarios between the two types of micelles (i) via an
insoluble state, if the LCST-type cloud point is below the
UCST-type cloud point, which is the case at low salt
concentrations or (ii) via a molecularly dissolved state, if
the LCST-type cloud point is above the UCST-type cloud
point, which is the case at high salt concentrations.
Systematic variation of the block lengths allowed for
verifying the anticipated behavior and identifying the
molecular architecture needed. The versatile and tunable
self-assembly offers manifold opportunities, for example,
for smart emulsifiers or for sophisticated carrier systems.},
cin = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1 / MLZ},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
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)KWS1-20140101 / EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31017439},
UT = {WOS:000468243500023},
doi = {10.1021/acs.langmuir.9b00241},
url = {https://juser.fz-juelich.de/record/862744},
}