Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Side Chain Dynamics of Poly(norbornene)-g-Poly(propylene oxide) Bottlebrush Polymers

Journal Article · · Macromolecular Rapid Communications
 [1];  [2];  [3];  [4];  [3];  [2]
  1. Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia)
  4. 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

References (35)

A Practical and Highly Active Ruthenium-Based Catalyst that Effects the Cross Metathesis of Acrylonitrile journal November 2002
Dynamic Homogeneity by Architectural Design - Bottlebrush Polymers journal May 2012
Neutron Spin Echo in Polymer Systems book January 2005
Q-dependence pf the relaxation times of the α-relaxation as observed by quasielastic neutron scattering journal September 1994
Heterogeneity of amorphous polymers with various fragility indices as studied in terms of non-Gaussian parameter journal August 1998
Inelastic and quasi-elastic neutron scattering spectrometers in J-PARC journal January 2017
Mantid—Data analysis and visualization package for neutron scattering and μ SR experiments
  • Arnold, O.; Bilheux, J. C.; Borreguero, J. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764 https://doi.org/10.1016/j.nima.2014.07.029
journal November 2014
Status of neutron spectrometers at J-PARC journal June 2019
Dynamics of PDMS- g -PDMS Bottlebrush Polymers by Broadband Dielectric Spectroscopy journal September 2020
Short-Time Dynamics of PDMS- g -PDMS Bottlebrush Polymer Melts Investigated by Quasi-Elastic Neutron Scattering journal October 2020
Dynamical Comparison of Different Polymer Architectures—Bottlebrush vs Linear Polymer journal February 2021
Influence of Side-Chain Length and Relative Rigidities of Backbone and Side Chains on Glass Formation of Branched Polymers journal June 2021
Solvent Effects in Grafting-through Ring-Opening Metathesis Polymerization journal April 2022
Melt Properties and String Model Description of Glass Formation in Graft Polymers of Different Side-Chain Lengths journal April 2022
Role of Dynamic Asymmetry on the Collective Dynamics of Comblike Polymers: Insights from Neutron Spin-Echo Experiments and Coarse-Grained Molecular Dynamics Simulations journal June 2016
Effect of Chain Length and Topological Constraints on Segmental Relaxation in Cyclic PDMS journal September 2018
Universality of Time–Temperature Scaling Observed by Neutron Spectroscopy on Bottlebrush Polymers journal May 2021
Synthesis and Micellization of Bottlebrush Poloxamers journal March 2022
Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers journal April 2018
Controlled High-Speed Anionic Polymerization of Propylene Oxide Initiated by Onium Salts in the Presence of Triisobutylaluminum journal October 2007
Structure and Dynamics of Self-Assembled Comb Copolymers: Comparison between Simulations of a Generic Model and Neutron Scattering Experiments journal March 2011
Quasielastic Neutron Scattering Study on the Dynamics of Poly(alkylene oxide)s journal May 2012
Dynamical and Structural Aspects of the Cold Crystallization of Poly(dimethylsiloxane) (PDMS) journal February 2008
Molecular Weight Dependence of Glassy Dynamics in Linear Polymers Revisited journal December 2008
Dynamics in Poly( n -alkyl methacrylates): A Neutron Scattering, Calorimetric, and Dielectric Study journal February 2010
Anomalous relaxation of self-assembled alkyl nanodomains in high-order poly(n-alkyl methacrylates) journal January 2008
Bottlebrush polymers in the melt and polyelectrolytes in solution share common structural features journal February 2020
EMU: High-Resolution Backscattering Spectrometer at ANSTO journal April 2016
Polymer Data Handbook book May 2009
Self-motion and the α relaxation in a simulated glass-forming polymer: Crossover from Gaussian to non-Gaussian dynamic behavior journal April 2002
Dynamics of Glass-Forming Polymers: “Homogeneous” versus “Heterogeneous” Scenario journal July 1998
Non-Gaussian Nature of the α Relaxation of Glass-Forming Polyisoprene journal November 2002
Non-Gaussian Parameter and Heterogeneity of Amorphous Polymers journal January 1997
DAVE: A Comprehensive Software Suite for the Reduction, Visualization, and Analysis of Low Energy Neutron Spectroscopic Data
  • Azuah, Richard Tumanjong; Kneller, Larry R.; Qiu, Yiming
  • Journal of Research of the National Institute of Standards and Technology, Vol. 114, Issue 6 https://doi.org/10.6028/jres.114.025
journal November 2009
Pelican — a Time of Flight Cold Neutron Polarization Analysis Spectrometer at OPAL journal January 2013