Side chain effects in the packing structure and stiffness of redox-responsive ferrocene-containing polymer brushes

Lu Gan, Jing Song, Shifeng Guo, Dominik Janczewski*, Christian A. Nijhuis*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

This paper describes the preparation of ferrocene-containing polymer brushes with different side chain lengths by surface-initiated atom transfer radical polymerization (SI-ATRP). The polymer brushes are characterized by cyclic voltammetry to determine the surface coverage of the ferrocene (Fc) units, their thickness in air by atomic force microscopy (AFM) and ellipsometry, and their mechanical properties by AFM-based nanoindentation. The results are compared against an ideal packing model and we conclude that brushes with short linkers between the Fc units and the polymer back bone are stiff and stand up in air up to 40 nm tall. In contrast, polymers with long linkers collapse and do not stand up in air. Our results indicate that the stiffness and packing structure of Fc-containing polymer brushes are affected by the length of the linkers between the Fc and polymer back bone.
Original languageEnglish
Pages (from-to)517-528
JournalEuropean polymer journal
Volume83
DOIs
Publication statusPublished - Oct 2016
Externally publishedYes

Keywords

  • Ferrocene
  • Polymer brush
  • Electrochemistry
  • Redox-active
  • Mechanical properties

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