- The isothermal vacuum-induced dehydration of thin films made of poly(methoxy diethylene glycol acrylate) (PMDEGA), which were swollen under ambient conditions, is studied. The dehydration behavior of the homopolymer film as well as of a nanostructured film of the amphiphilic triblock copolymer polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene, abbreviated as PS-b-PMDEGA-b-PS, are probed, and compared to the thermally induced dehydration behavior of such thin thermo-responsive films when they pass through their LCST-type coil-to globule collapse transition. The dehydration kinetics is followed by in-situ neutron reflectivity measurements. Contrast results from the use of deuterated water. Water content and film thickness are significantly reduced during the process, which can be explained by Schott second order kinetics theory for both films. The water content of the dehydrated equilibrium state from this model is very close to the residual water content obtained from the final static measurements, indicatingThe isothermal vacuum-induced dehydration of thin films made of poly(methoxy diethylene glycol acrylate) (PMDEGA), which were swollen under ambient conditions, is studied. The dehydration behavior of the homopolymer film as well as of a nanostructured film of the amphiphilic triblock copolymer polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene, abbreviated as PS-b-PMDEGA-b-PS, are probed, and compared to the thermally induced dehydration behavior of such thin thermo-responsive films when they pass through their LCST-type coil-to globule collapse transition. The dehydration kinetics is followed by in-situ neutron reflectivity measurements. Contrast results from the use of deuterated water. Water content and film thickness are significantly reduced during the process, which can be explained by Schott second order kinetics theory for both films. The water content of the dehydrated equilibrium state from this model is very close to the residual water content obtained from the final static measurements, indicating that residual water still remains in the film even after prolonged exposure to the vacuum. In the PS-b-PMDEGA-b-PS film that shows micro-phase separation, the hydrophobic PS domains modify the dehydration process by hindering the water removal, and thus retarding dehydration by about 30%. Whereas residual water remains tightly bound in the PMDEGA domains, water is completely removed from the PS domains of the block copolymer film. (C) 2017 Elsevier Ltd. All rights reserved.…
MetadatenAuthor details: | Qi Zhong, Ezzeldin Metwalli, Monika Rawolle, Gunar Kaune, Achille Mayelle Bivigou Koumba, Andre LaschewskyORCiDGND, Christine M. PapadakisORCiDGND, Robert Cubitt, Jiping Wang, Peter Müller-Buschbaum |
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DOI: | https://doi.org/10.1016/j.polymer.2017.07.066 |
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ISSN: | 0032-3861 |
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ISSN: | 1873-2291 |
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Title of parent work (English): | Polymer : the international journal for the science and technology of polymers |
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Publisher: | Elsevier |
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Place of publishing: | Oxford |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2017 |
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Publication year: | 2017 |
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Release date: | 2020/04/20 |
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Tag: | Dehydration; In-situ neutron reflectivity; Vacuum drying |
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Volume: | 124 |
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Number of pages: | 11 |
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First page: | 263 |
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Last Page: | 273 |
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Funding institution: | DFG [Mu1487/8, Pa771/4, La611/7]; National Natural Science Foundation of China [51403186]; Zhejiang Provincial Natural Science Foundation of China [LQ14E030009]; Zhejiang Provincial Top Key Academic Discipline of Chemical Engineering and Technology of Zhejiang Sci-Tech University [CETT2015002] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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Peer review: | Referiert |
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