Qi Zhong, Lei Mi, Ezzeldin Metwalli, Lorenz Biessmann, Martine Philipp, Anna Miasnikova, Andre Laschewsky, Christine M. Papadakis, Robert Cubitt, Matthias Schwartzkopf, Stephan V. Roth, Jiping Wang, Peter Müller-Buschbaum
- The effect of chain architecture on the swelling and thermal response of thin films obtained from an amphiphilic three-arm star-shaped thermo-responsive block copolymer poly(methoxy diethylene glycol acrylate)-block-polystyrene ((PMDEGA-b-PS)(3)) is investigated by in situ neutron reflectivity (NR) measurements. The PMDEGA and PS blocks are micro-phase separated with randomly distributed PS nanodomains. The (PMDEGA-b-PS)(3) films show a transition temperature (TT) at 33 degrees C in white light interferometry. The swelling capability of the (PMDEGA-b-PS)(3) films in a D2O vapor atmosphere is better than that of films from linear PS-b-PMDEGA-b-PS triblock copolymers, which can be attributed to the hydrophilic end groups and limited size of the PS blocks in (PMDEGA-b-PS)(3). However, the swelling kinetics of the as-prepared (PMDEGA-b-PS)(3) films and the response of the swollen film to a temperature change above the TT are significantly slower than that in the PS-b-PMDEGA-b-PS films, which may be related to the conformation restrictionThe effect of chain architecture on the swelling and thermal response of thin films obtained from an amphiphilic three-arm star-shaped thermo-responsive block copolymer poly(methoxy diethylene glycol acrylate)-block-polystyrene ((PMDEGA-b-PS)(3)) is investigated by in situ neutron reflectivity (NR) measurements. The PMDEGA and PS blocks are micro-phase separated with randomly distributed PS nanodomains. The (PMDEGA-b-PS)(3) films show a transition temperature (TT) at 33 degrees C in white light interferometry. The swelling capability of the (PMDEGA-b-PS)(3) films in a D2O vapor atmosphere is better than that of films from linear PS-b-PMDEGA-b-PS triblock copolymers, which can be attributed to the hydrophilic end groups and limited size of the PS blocks in (PMDEGA-b-PS)(3). However, the swelling kinetics of the as-prepared (PMDEGA-b-PS)(3) films and the response of the swollen film to a temperature change above the TT are significantly slower than that in the PS-b-PMDEGA-b-PS films, which may be related to the conformation restriction by the star-shape. Unlike in the PS-b-PMDEGA-b-PS films, the amount of residual D2O in the collapsed (PMDEGA-b-PS)(3) films depends on the final temperature. It decreases from (9.7 +/- 0.3)% to (7.0 +/- 0.3)% or (6.0 +/- 0.3)% when the final temperatures are set to 35 degrees C, 45 degrees C and 50 degrees C, respectively. This temperature-dependent reduction of embedded D2O originates from the hindrance of chain conformation from the star-shaped chain architecture.…
MetadatenVerfasserangaben: | Qi ZhongORCiD, Lei Mi, Ezzeldin Metwalli, Lorenz BiessmannORCiD, Martine PhilippORCiD, Anna Miasnikova, Andre LaschewskyORCiDGND, Christine M. PapadakisORCiDGND, Robert Cubitt, Matthias Schwartzkopf, Stephan V. RothORCiD, Jiping Wang, Peter Müller-BuschbaumORCiDGND |
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DOI: | https://doi.org/10.1039/c8sm00965a |
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ISSN: | 1744-683X |
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ISSN: | 1744-6848 |
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Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/30052259 |
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Titel des übergeordneten Werks (Englisch): | Soft matter |
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Verlag: | Royal Society of Chemistry |
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Verlagsort: | Cambridge |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Erstveröffentlichung: | 19.07.2018 |
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Erscheinungsjahr: | 2018 |
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Datum der Freischaltung: | 15.10.2021 |
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Band: | 14 |
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Ausgabe: | 31 |
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Seitenanzahl: | 13 |
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Erste Seite: | 6582 |
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Letzte Seite: | 6594 |
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Fördernde Institution: | DFG priority program "Intelligente Hydrogele" [Mu1487/8, Pa771/4, La611/7]; National Natural Science Foundation of ChinaNational Natural |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
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Peer Review: | Referiert |
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