Triple-Stimuli-Responsive Ferrocene-Containing PEGs in Water and on the Surface

Arda Alkan, Christian Steinmetz, Katharina Landfester, Frederik R. Wurm*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)
3 Downloads (Pure)

Abstract

Triple-stimuli-responsive PEG-based materials are prepared by living anionic ring-opening copolymerization of ethylene oxide and vinyl ferrocenyl glycidyl ether and subsequent thiol-ene postpolymerization modification with cysteamine. The hydrophilicity of these materials can be tuned by three stimuli: (i) temperature (depending on the comonomer ratio), (ii) oxidation state of iron centers in the ferrocene moieties, and (iii) pH-value (through amino groups), both in aqueous solution and at the interface after covalent attachment to a glass surface. In such materials, the cloud point temperatures are adjustable in solution by changing oxidation state and/or pH. On the surface, the contact angle increases with increasing pH and temperature and after oxidation, making these smart surfaces interesting for catalytic applications. Also, their redox response can be switched by temperature and pH, making this material useful for catalysis and electrochemistry applications. Exemplarily, the temperature-dependent catalysis of the chemiluminescence of luminol (a typical blood analysis tool in forensics) was investigated with these polymers.

Original languageEnglish
Pages (from-to)26137-26144
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number47
DOIs
Publication statusPublished - 2 Dec 2015
Externally publishedYes

Keywords

  • ferrocene
  • polyether
  • redox-active polymer
  • smart surface
  • stimuli responsive

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