Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy

Jakobi, Bruno; Bichler, Karin J.; Sokolova, Anna; Schneider, Gerald J.

doi:10.1021/acs.macromol.0c01277

Dynamics of PDMS-g-PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy

Journal Article · Fri Sep 18 00:00:00 EDT 2020 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.0c01277· OSTI ID:1773778

^[1]; ^[2]; Sokolova, Anna ^[3]; ^[2]

Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University
Louisiana State Univ., Baton Rouge, LA (United States)
Australia Center for Neutron Scattering, ANSTO, Lucas Heights (Australia)

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.

View Accepted Manuscript (DOE)

Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University, Baton Rouge, LA, United States

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

Contributing Organization:: Australian Nuclear Science and Technology Organisation (ANSTO)

Grant/Contract Number:: SC0019050

OSTI ID:: 1773778

Alternate ID(s):: OSTI ID: 2271666

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 19 Vol. 53; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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