Side Chain Dynamics of Poly(norbornene)-g-Poly(propylene oxide) Bottlebrush Polymers
Journal Article
·
· Macromolecular Rapid Communications
- Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University
- Louisiana State Univ., Baton Rouge, LA (United States)
- Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia)
- Comprehensive Research Organization for Science and Society (CROSS) (Japan)
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, $$\langle$$r2(t)$$\rangle$$, and the non-Gaussian parameter,α2(t). Herein, the bottlebrush polymer shows a more restricted dynamics, whereas the linear PPO reaches $$\langle$$r2(t)$$\rangle$$∝t0.5at the highest temperature. The deviations from Gaussian behavior are evident at the α2(t). Both samples show a decaying α2(t). Finally, the non-Gaussian parameter supports the results from the power law dependence of the relaxation times, with lower α2(t) values for PPO compared to those for PNB-g-PPO, pointing to less deviations from Gaussian behavior.
- Research Organization:
- Louisiana State University, Baton Rouge, LA, United States
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0019050
- OSTI ID:
- 2271660
- Alternate ID(s):
- OSTI ID: 1909255
- Journal Information:
- Macromolecular Rapid Communications, Journal Name: Macromolecular Rapid Communications Journal Issue: 7 Vol. 44; ISSN 1022-1336
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English