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Title: Altering surface fluctuations by blending tethered and untethered chains

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, 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.

Authors:
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [1]
  1. Univ. of Akron, OH (United States)
  2. Bogazici Univ., Istanbul (Turkey); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1427465
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 13; Journal Issue: 44; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Lee, J. K., Akgun, B., Jiang, Z., Narayanan, S., and Foster, M. D. Altering surface fluctuations by blending tethered and untethered chains. United States: N. p., 2017. Web. doi:10.1039/c7sm01616f.
Lee, J. K., Akgun, B., Jiang, Z., Narayanan, S., & Foster, M. D. Altering surface fluctuations by blending tethered and untethered chains. United States. doi:10.1039/c7sm01616f.
Lee, J. K., Akgun, B., Jiang, Z., Narayanan, S., and Foster, M. D. Mon . "Altering surface fluctuations by blending tethered and untethered chains". United States. doi:10.1039/c7sm01616f. https://www.osti.gov/servlets/purl/1427465.
@article{osti_1427465,
title = {Altering surface fluctuations by blending tethered and untethered chains},
author = {Lee, J. K. and Akgun, B. and Jiang, Z. and Narayanan, S. and Foster, M. D.},
abstractNote = {"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.},
doi = {10.1039/c7sm01616f},
journal = {Soft Matter},
issn = {1744-683X},
number = 44,
volume = 13,
place = {United States},
year = {2017},
month = {10}
}

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Cited by: 2 works
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