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Title: Impact of hydrogen bonding on dynamics of hydroxyl-terminated polydimethylsiloxane

Abstract

Dielectric spectroscopy, rheology, and differential scanning calorimetry were employed to study the effect of chain-end hydrogen bonding on the dynamics of hydroxylterminated polydimethylsiloxane. We demonstrate that hydrogen bonding has a strong influence on both segmental and slower dynamics in the systems with low molecular weights. In particular, the decrease in the chain length leads to an increase of the glass transition temperature, viscosity, and fragility index, at variance with the usual behavior of nonassociating polymers. The supramolecular association of hydroxylterminated chains leads to the emergence in dielectric and mechanical relaxation spectra of the so-called Debye process traditionally observed in monohydroxy alcohols. Our analysis suggests that the hydroxyl-terminated PDMS oligomers may associate in brush-like or chain-like structures, depending on the size of their covalent chains. Finally, the effective length of the linear-associated chains was estimated from the rheological measurements.

Authors:
 [1];  [1];  [2];  [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Technische Univ. Dortmund, Dortmund (Germany)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1342694
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 49; Journal Issue: 8; Journal ID: ISSN 0024-9297
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; hydrogen bonds; associating polymers; Debye process; dielectric spectroscopy; rheology

Citation Formats

Xing, Kunyue, Chatterjee, Sabornie, Saito, Tomonori, Gainaru, Catalin P., and Sokolov, Alexei P. Impact of hydrogen bonding on dynamics of hydroxyl-terminated polydimethylsiloxane. United States: N. p., 2016. Web. doi:10.1021/acs.macromol.6b00262.
Xing, Kunyue, Chatterjee, Sabornie, Saito, Tomonori, Gainaru, Catalin P., & Sokolov, Alexei P. Impact of hydrogen bonding on dynamics of hydroxyl-terminated polydimethylsiloxane. United States. doi:10.1021/acs.macromol.6b00262.
Xing, Kunyue, Chatterjee, Sabornie, Saito, Tomonori, Gainaru, Catalin P., and Sokolov, Alexei P. Wed . "Impact of hydrogen bonding on dynamics of hydroxyl-terminated polydimethylsiloxane". United States. doi:10.1021/acs.macromol.6b00262. https://www.osti.gov/servlets/purl/1342694.
@article{osti_1342694,
title = {Impact of hydrogen bonding on dynamics of hydroxyl-terminated polydimethylsiloxane},
author = {Xing, Kunyue and Chatterjee, Sabornie and Saito, Tomonori and Gainaru, Catalin P. and Sokolov, Alexei P.},
abstractNote = {Dielectric spectroscopy, rheology, and differential scanning calorimetry were employed to study the effect of chain-end hydrogen bonding on the dynamics of hydroxylterminated polydimethylsiloxane. We demonstrate that hydrogen bonding has a strong influence on both segmental and slower dynamics in the systems with low molecular weights. In particular, the decrease in the chain length leads to an increase of the glass transition temperature, viscosity, and fragility index, at variance with the usual behavior of nonassociating polymers. The supramolecular association of hydroxylterminated chains leads to the emergence in dielectric and mechanical relaxation spectra of the so-called Debye process traditionally observed in monohydroxy alcohols. Our analysis suggests that the hydroxyl-terminated PDMS oligomers may associate in brush-like or chain-like structures, depending on the size of their covalent chains. Finally, the effective length of the linear-associated chains was estimated from the rheological measurements.},
doi = {10.1021/acs.macromol.6b00262},
journal = {Macromolecules},
number = 8,
volume = 49,
place = {United States},
year = {2016},
month = {4}
}

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Cited by: 6 works
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