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Porous Ultra-Thin Films from Photocleavable Block Copolymers: In-Situ Degradation Kinetics Study of Pore Material

Altinpinar, Sedakat; Ali, Wael; Schuchardt, Patrick; Yildiz, Pinar; Zhao, Hui; Theato, Patrick ORCID iD icon 1,2; Gutmann, Jochen S.
1 Institut für Biologische Grenzflächen (IBG), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)


On the basis of the major application for block copolymers to use them as separation membranes, lithographic mask, and as templates, the preparation of highly oriented nanoporous thin films requires the selective removal of the minor phase from the pores. In the scope of this study, thin film of polystyrene-block-poly(ethylene oxide) block copolymer with a photocleavable junction groups based on ortho-nitrobenzylester (ONB) (PS-hν-PEO) was papered via the spin coating technique followed by solvent annealing to obtain highly-ordered cylindrical domains. The polymer blocks are cleaved by means of a mild UV exposure and then the pore material is washed out of the polymer film by ultra-pure water resulting in arrays of nanoporous thin films to remove one block. The removal of the PEO materials from the pores was proven using the grazing-incidence small-angle X-ray scattering (GISAXS) technique. The treatment of the polymer film during the washing process was observed in real time after two different UV exposure time (1 and 4 h) in order to draw conclusions regarding the dynamics of the removal process. In-situ X-ray reflectivity measurements provide statistically significant information about the change in the layer thickness as well as the roughness and electron density of the polymer film during pore formation. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000120403
Veröffentlicht am 23.06.2020
DOI: 10.3390/polym12040781
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2073-4360
KITopen-ID: 1000120403
HGF-Programm 47.02.03 (POF III, LK 01) Zellpopul.auf Biofunk.Oberflächen IBG-3
Erschienen in Polymers
Verlag MDPI
Band 12
Heft 4
Seiten Article: 781
Vorab online veröffentlicht am 02.04.2020
Schlagwörter block copolymers; photocleavage; in-situ SFM; in-situ X-ray reflectivity; GISAXS
Nachgewiesen in Dimensions
Web of Science
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