Jump to main content
Jump to site search

Issue 44, 2017
Previous Article Next Article

Altering surface fluctuations by blending tethered and untethered chains

Author affiliations

Abstract

“Partially tethering” a thin film of a polymer melt by covalently attaching to the substrate a fraction of the chains in an unentangled melt dramatically increases the relaxation time of the surface height fluctuations. This phenomenon is observed even when the film thickness, h, is 20 times the unperturbed chain radius, Rg,tethered, of the tethered chains, indicating that partial tethering is more influential than any physical attraction with the substrate. Furthermore, a partially tethered layer of a low average molecular weight of 5k showed much slower surface fluctuations than did a reference layer of pure untethered chains of much greater molecular weight (48k), so the partial tethering effect is stronger than the effects of entanglement and increase in glass transition temperature, Tg, with molecular weight. Partial tethering offers a means of tailoring these fluctuations which influence wetting, adhesion, and tribology of the surface.

Graphical abstract: Altering surface fluctuations by blending tethered and untethered chains

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Aug 2017, accepted on 14 Oct 2017 and first published on 16 Oct 2017


Article type: Paper
DOI: 10.1039/C7SM01616F
Citation: Soft Matter, 2017,13, 8264-8270
  •   Request permissions

    Altering surface fluctuations by blending tethered and untethered chains

    J. K. Lee, B. Akgun, Z. Jiang, S. Narayanan and M. D. Foster, Soft Matter, 2017, 13, 8264
    DOI: 10.1039/C7SM01616F

Search articles by author

Spotlight

Advertisements