TY  - JOUR
A1  - Kreuzer, Lucas
A1  - Widmann, Tobias
A1  - Hohn, Nuri
A1  - Wang, Kun
A1  - Biessmann, Lorenz
A1  - Peis, Leander
A1  - Moulin, Jean-Francois
A1  - Hildebrand, Viet
A1  - Laschewsky, André
A1  - Papadakis, Christine M.
A1  - Müller-Buschbaum, Peter
T1  - Swelling and exchange behavior of poly(sulfobetaine)-based block copolymer thin films
T2  - Macromolecules : web edition
N2  - The humidity-induced swelling and exchange behavior of a block copolymer thin film, which consists of a zwitterionic poly(sulfobetaine) [poly(N,N-dimethyl-N-(3-(methacrylamido)propyl)ammoniopropanesulfonate) (PSPP)] block and a nonionic poly(N-isopropylacrylamide) (PNIPAM) block, are investigated by time-of-flight neutron reflectometry (TOF-NR). We monitor in situ the swelling in the H2O atmosphere, followed by an exchange with D2O. In the reverse experiment, swelling in the D2O atmosphere and the subsequent exchange with H2O are studied. Both, static and kinetic TOF-NR measurements indicate significant differences in the interactions between the PSPP80-b-PNIPAM(130) thin film and H2O or D2O, which we attribute to the different H- and D-bonds between water and the polymer. Changes in the chain conformation and hydrogen bonding are probed with Fourier transform infrared spectroscopy during the kinetics of the swelling and exchange processes, which reveals the key roles of the ionic SO3- group in the PSPP block and of the polar amide groups of both blocks during water uptake and exchange.
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/49353
SN  - 0024-9297
SN  - 1520-5835
VL  - 52
IS  - 9
SP  - 3486
EP  - 3498
PB  - American Chemical Society
CY  - Washington
ER  -