Altering surface fluctuations by blending tethered and untethered chains

Lee, J. K.; Akgun, B.; Jiang, Z.; Narayanan, S.; Foster, M. D.

doi:10.1039/c7sm01616f

Title: Altering surface fluctuations by blending tethered and untethered chains

Journal Article · Mon Oct 16 00:00:00 EDT 2017 · Soft Matter

DOI:https://doi.org/10.1039/c7sm01616f· OSTI ID:1427465

^[1]; Akgun, B. ^[2]; Jiang, Z. ^[3]; Narayanan, S. ^[3];

^[1]

Univ. of Akron, OH (United States)
Bogazici Univ., Istanbul (Turkey); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

"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, R_g,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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1427465

Journal Information:: Soft Matter, Vol. 13, Issue 44; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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