TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Jung, Florian A.
A1  - Schart, Maximilian
A1  - Bührend, Lukas
A1  - Meidinger, Elisabeth
A1  - Kang, Jia-Jhen
A1  - Niebuur, Bart-Jan
A1  - Ariaee, Sina
A1  - Molodenskiy, Dmitry S.
A1  - Posselt, Dorthe
A1  - Amenitsch, Heinz
A1  - Tsitsilianis, Constantinos
A1  - Papadakis, Christine M.
T1  - Highly Tunable Nanostructures in a Doubly pH-Responsive Pentablock Terpolymer in Solution and in Thin Films
JF  - Advanced Functional Materials
N2  - Multiblock copolymers with charged blocks are complex systems that show great potential for enhancing the structural control of block copolymers. A pentablock terpolymer PMMA-b-PDMAEMA-b-P2VP-b-PDMAEMA-b-PMMA is investigated. It contains two types of midblocks, which are weak cationic polyelectrolytes, namely poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and poly(2-vinylpyridine) (P2VP). Furthermore, these are end-capped with short hydrophobic poly(methyl methacrylate) (PMMA) blocks in dilute aqueous solution and thin films. The self-assembly behavior depends on the degrees of ionization α of the P2VP and PDMAEMA blocks, which are altered in a wide range by varying the pH value. High degrees of ionization of both blocks prevent structure formation, whereas microphase-separated nanostructures form for a partially charged and uncharged state. While in solutions, the nanostructure formation is governed by the dependence of the P2VP block solubility of the and the flexibility of the PDMAEMA blocks on α, in thin films, the dependence of the segregation strength on α is key. Furthermore, the solution state plays a crucial role in the film formation during spin-coating. Overall, both the mixing behavior of the 3 types of blocks and the block sequence, governing the bridging behavior, result in strong variations of the nanostructures and their repeat distances.
KW  - block polymers
KW  - dynamic light scattering
KW  - grazing-incidence
KW  - small-angle-x-ray-scattering
KW  - pH-responsive polymers
Y1  - 2021
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-978
U6  - https://doi.org/10.1002/adfm.202102905
DO  - https://doi.org/10.1002/adfm.202102905
VL  - 31
IS  - 32
SP  - 2102905
ER  -