Title
Side Chain Dynamics of poly(norbornene)-g-Poly(propylene oxide) Bottlebrush Polymers
Document Type
Article
Publication Date
12-23-2022
Abstract
The segmental dynamics of the side chains of poly(norbornene)-g-poly(propylene oxide) (PNB-g-PPO) bottlebrush polymer in comparison to PPO is studied by quasi-elastic neutron scattering. Having experimental time and length scale information simultaneously allows to extract spatial information in addition to relaxation time. Tethering one end of the PPO side chain onto a stiff PNB backbone slows down the segmental relaxation, over the length and time scales investigated. The power law dependence of the relaxation time on the momentum transfer, Q, indicates a more heterogeneous relaxation pattern for the bottlebrush polymer, whereas the linear PPO has less deviations from a homogenous relaxation. Similar conclusions can be drawn from the time dependent mean square displacement, 〈r (t)〉, and the non-Gaussian parameter, α (t). Here the bottlebrush polymer shows a more restricted dynamics, whereas the linear PPO reaches 〈r (t)〉∝t at the highest temperature. The deviations from Gaussian behavior are evident at the α (t). Both samples show a decaying α (t). The non-Gaussian parameter supports the results from the power law dependence of the relaxation times, with lower α (t) values for PPO compared to those for PNB-g-PPO, pointing to less deviations from Gaussian behavior. This article is protected by copyright. All rights reserved.
Publication Source (Journal or Book title)
Macromolecular rapid communications
First Page
e2200902
Recommended Citation
Bichler, K. J., Jakobi, B., Klapproth, A., Tominaga, T., Mole, R. A., & Schneider, G. J. (2022). Side Chain Dynamics of poly(norbornene)-g-Poly(propylene oxide) Bottlebrush Polymers. Macromolecular rapid communications, e2200902. https://doi.org/10.1002/marc.202200902