TU Darmstadt / ULB / TUbiblio

Preparation and Characterization of Light-Switchable Polymer Networks Attached to Solid Substrates

Schenderlein, Helge and Voss, Agnieszka and Stark, Robert W. and Biesalski, Markus (2013):
Preparation and Characterization of Light-Switchable Polymer Networks Attached to Solid Substrates.
In: Langmuir, ACS Publications, pp. 4525-4534, 29, (14), ISSN 0743-7463, [Online-Edition: http://dx.doi.org/10.1021/la305073p],
[Article]

Abstract

Surface-attached polymer networks that carry light-responsive nitrospiropyran groups in a hydrophilic PDMAA matrix were prepared on planar silicon and glass surfaces and were characterized with respect to their switching behavior under the influence of an external light trigger. Functional polymers bearing light-responsive units as well as photo-cross-linkable benzophenone groups were first synthesized using free radical copolymerization. The number of spiropyran groups in the copolymer was controlled by adjusting the concentration of the respective monomer in the copolymerization feed. The polymer films were prepared by spin-coating the functional polymers from solution and by ultraviolet light (UV)-induced cross-linking utilizing benzophenone photochemistry. On substrates with immobilized benzophenone groups, the complete polymer network is linked to the surface. The dry thickness of the films can be controlled over a wide range from a few nanometers up to more than 1 μm. The integration of such light-switchable organic moieties into a surface-attached polymer network allows one to increase the overall number of light-responsive groups per surface area by adjusting the amount of surface-attached polymer networks. The spiropyran’s function in dry (solvent-free) and swollen polymer films can be reversibly switched by UV and visible irradiation. In addition, the switching in water is faster than in the dry state. Therefore, implementing light-responsive spiropyran functions in polymer films linked to solid surfaces could allow for switching of the chemical and optical surface properties in a fast and spatially controlled fashion.

Item Type: Article
Erschienen: 2013
Creators: Schenderlein, Helge and Voss, Agnieszka and Stark, Robert W. and Biesalski, Markus
Title: Preparation and Characterization of Light-Switchable Polymer Networks Attached to Solid Substrates
Language: English
Abstract:

Surface-attached polymer networks that carry light-responsive nitrospiropyran groups in a hydrophilic PDMAA matrix were prepared on planar silicon and glass surfaces and were characterized with respect to their switching behavior under the influence of an external light trigger. Functional polymers bearing light-responsive units as well as photo-cross-linkable benzophenone groups were first synthesized using free radical copolymerization. The number of spiropyran groups in the copolymer was controlled by adjusting the concentration of the respective monomer in the copolymerization feed. The polymer films were prepared by spin-coating the functional polymers from solution and by ultraviolet light (UV)-induced cross-linking utilizing benzophenone photochemistry. On substrates with immobilized benzophenone groups, the complete polymer network is linked to the surface. The dry thickness of the films can be controlled over a wide range from a few nanometers up to more than 1 μm. The integration of such light-switchable organic moieties into a surface-attached polymer network allows one to increase the overall number of light-responsive groups per surface area by adjusting the amount of surface-attached polymer networks. The spiropyran’s function in dry (solvent-free) and swollen polymer films can be reversibly switched by UV and visible irradiation. In addition, the switching in water is faster than in the dry state. Therefore, implementing light-responsive spiropyran functions in polymer films linked to solid surfaces could allow for switching of the chemical and optical surface properties in a fast and spatially controlled fashion.

Journal or Publication Title: Langmuir
Volume: 29
Number: 14
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Date Deposited: 16 Jun 2014 11:13
Official URL: http://dx.doi.org/10.1021/la305073p
Identification Number: doi:10.1021/la305073p
Funders: We gratefully acknowledge fi nancial support from the Landes- O ff ensive zur Entwicklung Wissenschaftlich-o konomischer Excellenz (LOEWE) of the State of Hesse through research initiative Soft Control., A.V. thanks DFG Exc. 259 for seed funds.
Export:

Optionen (nur für Redakteure)

View Item View Item