Swelling and Exchange Behavior of Poly(sulfobetaine)-Based Block Copolymer Thin Films
| Autor: | Jean-François Moulin, Nuri Hohn, André Laschewsky, Christine M. Papadakis, Tobias Widmann, Peter Müller-Buschbaum, Leander Peis, Viet Hildebrand, Lucas P. Kreuzer, Lorenz Bießmann, Kun Wang |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics thin film Ionic bonding block copolymer 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry sulfobetaine Materials Chemistry medicine Copolymer Thin film Fourier transform infrared spectroscopy swelling and exchange behavior chemistry.chemical_classification neutron reflectometry Hydrogen bond Organic Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering ddc:540 Institut für Chemie Neutron reflectometry Swelling medicine.symptom 0210 nano-technology |
| Zdroj: | Macromolecules. 52:3486-3498 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.9b00443 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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