Neng Hu, Li Lin, Ezzeldin Metwalli, Lorenz Bießmann, Martine Philipp, Viet Hildebrand, André Laschewsky, Christine M. Papadakis, Robert Cubitt, Qi Zhong, Peter Müller-Buschbaum
- The kinetics of water transfer between the lower critical solution temperature (LCST) and upper critical solution temperature (UCST) thermoresponsive blocks in about 10 nm thin films of a diblock copolymer is monitored by in situ neutron reflectivity. The UCST-exhibiting block in the copolymer consists of the zwitterionic poly(4((3-methacrylamidopropyl)dimethylammonio)butane-1-sulfonate), abbreviated as PSBP. The LCST-exhibiting block consists of the nonionic poly(N-isopropylacrylamide), abbreviated as PNIPAM. The as-prepared PSBP80-b-PNIPAM(400) films feature a three-layer structure, i.e., PNIPAM, mixed PNIPAM and PSBP, and PSBP. Both blocks have similar transition temperatures (TTs), namely around 32 degrees C for PNIPAM, and around 35 degrees C for PSBP, and with a two-step heating protocol (20 degrees C to 40 degrees C and 40 degrees C to 80 degrees C), both TTs are passed. The response to such a thermal stimulus turns out to be complex. Besides a three-step process (shrinkage, rearrangement, and reswelling), a continuous transferThe kinetics of water transfer between the lower critical solution temperature (LCST) and upper critical solution temperature (UCST) thermoresponsive blocks in about 10 nm thin films of a diblock copolymer is monitored by in situ neutron reflectivity. The UCST-exhibiting block in the copolymer consists of the zwitterionic poly(4((3-methacrylamidopropyl)dimethylammonio)butane-1-sulfonate), abbreviated as PSBP. The LCST-exhibiting block consists of the nonionic poly(N-isopropylacrylamide), abbreviated as PNIPAM. The as-prepared PSBP80-b-PNIPAM(400) films feature a three-layer structure, i.e., PNIPAM, mixed PNIPAM and PSBP, and PSBP. Both blocks have similar transition temperatures (TTs), namely around 32 degrees C for PNIPAM, and around 35 degrees C for PSBP, and with a two-step heating protocol (20 degrees C to 40 degrees C and 40 degrees C to 80 degrees C), both TTs are passed. The response to such a thermal stimulus turns out to be complex. Besides a three-step process (shrinkage, rearrangement, and reswelling), a continuous transfer of D2O from the PNIPAM to the PSBP block is observed. Due to the existence of both, LCST and UCST blocks in the PSBP80-b-PNIPAM(400 )film, the water transfer from the contracting PNIPAM, and mixed layers to the expanding PSBP layer occurs. Thus, the hydration kinetics and thermal response differ markedly from a thermoresponsive polymer film with a single LCST transition.…
MetadatenAuthor details: | Neng Hu, Li Lin, Ezzeldin MetwalliGND, Lorenz Bießmann, Martine PhilippGND, Viet HildebrandGND, André LaschewskyORCiDGND, Christine M. PapadakisORCiDGND, Robert Cubitt, Qi ZhongGND, Peter Müller-BuschbaumORCiDGND |
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DOI: | https://doi.org/10.1002/admi.202201913 |
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ISSN: | 2196-7350 |
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Title of parent work (English): | Advanced materials interfaces |
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Publisher: | Wiley-VCH |
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Place of publishing: | Weinheim |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2022/12/04 |
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Publication year: | 2023 |
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Release date: | 2023/11/17 |
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Tag: | block copolymer; dual thermoresponsive; kinetic water transfer; neutron; reflectivity; thin film |
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Volume: | 10 |
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Issue: | 3 |
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Article number: | 2201913 |
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Number of pages: | 11 |
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Funding institution: | National Natural Science Foundation of China [52173087, 51403186,; 51611130312]; Zhejiang Provincial Natural Science Foundation of China; [LY21E030022]; National Key R&D Program of China [2017YFB0309600];; Fundamental Research Funds of Zhejiang Sci-Tech University [2021Y003];; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [PA; 771/14-1, MU 1487/17-1, LA 611/11-1] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Hybrid Open-Access |
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License (German): | CC-BY - Namensnennung 4.0 International |
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