Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy
Abstract
Poly(dimethylsiloxane) (PDMS)-based bottlebrush polymers, PDMS-g-PDMS, have been synthesized by anionic polymerization in combination with a condensation-based grafting reaction. Bottlebrush polymers show intriguing features, e.g., extremely low viscosities. Hereby, studies of their dynamics are rare. Therefore, we focus on the segmental relaxation by broadband dielectric spectroscopy. An increasing cross-sectional radius proportional to the increasing side chain length has been observed by small-angle neutron scattering over three samples. Here, a comparison of the segmental relaxation times of the bottlebrushes with the respective linear chains reveals slower dynamics in the former. For longer chains, this effect vanishes.
- Authors:
-
- Louisiana State Univ., Baton Rouge, LA (United States)
- Australia Center for Neutron Scattering, ANSTO, Lucas Heights (Australia)
- Publication Date:
- Research Org.:
- Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University, Baton Rouge, LA, United States
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Org.:
- Australian Nuclear Science and Technology Organisation (ANSTO)
- OSTI Identifier:
- 1773778
- Alternate Identifier(s):
- OSTI ID: 2271666
- Grant/Contract Number:
- SC0019050
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Macromolecules
- Additional Journal Information:
- Journal Volume: 53; Journal Issue: 19; Related Information: https://pubs.acs.org/doi/10.1021/acs.macromol.0c01277; Journal ID: ISSN 0024-9297
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Bottlebrushes; neutron scattering; dynamics; polymers; soft matter; dielectric spectroscopy; fast field cycling NMR; insulators; silicones
Citation Formats
Jakobi, Bruno, Bichler, Karin J., Sokolova, Anna, and Schneider, Gerald J. Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy. United States: N. p., 2020.
Web. doi:10.1021/acs.macromol.0c01277.
Jakobi, Bruno, Bichler, Karin J., Sokolova, Anna, & Schneider, Gerald J. Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy. United States. https://doi.org/10.1021/acs.macromol.0c01277
Jakobi, Bruno, Bichler, Karin J., Sokolova, Anna, and Schneider, Gerald J. Fri .
"Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy". United States. https://doi.org/10.1021/acs.macromol.0c01277. https://www.osti.gov/servlets/purl/1773778.
@article{osti_1773778,
title = {Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy},
author = {Jakobi, Bruno and Bichler, Karin J. and Sokolova, Anna and Schneider, Gerald J.},
abstractNote = {Poly(dimethylsiloxane) (PDMS)-based bottlebrush polymers, PDMS-g-PDMS, have been synthesized by anionic polymerization in combination with a condensation-based grafting reaction. Bottlebrush polymers show intriguing features, e.g., extremely low viscosities. Hereby, studies of their dynamics are rare. Therefore, we focus on the segmental relaxation by broadband dielectric spectroscopy. An increasing cross-sectional radius proportional to the increasing side chain length has been observed by small-angle neutron scattering over three samples. Here, a comparison of the segmental relaxation times of the bottlebrushes with the respective linear chains reveals slower dynamics in the former. For longer chains, this effect vanishes.},
doi = {10.1021/acs.macromol.0c01277},
journal = {Macromolecules},
number = 19,
volume = 53,
place = {United States},
year = {Fri Sep 18 00:00:00 EDT 2020},
month = {Fri Sep 18 00:00:00 EDT 2020}
}
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