Universality of time–temperature scaling observed by neutron spectroscopy on bottlebrush polymers
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Date
2021-05-14
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
The understanding of materials requires access to the dynamics over many orders of magnitude in time; however, single analytical techniques are restricted in their respective time ranges. Assuming a functional relationship between time and temperature is one viable tool to overcome these limits. Despite its frequent usage, a breakdown of this assertion at the glass-transition temperature is common. Here, we take advantage of time- and length-scale information in neutron spectroscopy to show that the separation of different processes is the minimum requirement toward a more universal picture at, and even below, the glass transition for our systems. This is illustrated by constructing the full proton mean-square displacement for three bottlebrush polymers from femto- to nanoseconds, with simultaneous information on the partial contributions from segmental relaxation, methyl group rotation, and vibrations. The information can be used for a better analysis of results from numerous techniques and samples, improving the overall understanding of materials properties. © 2021 The Authors. Published by American Chemical Society. Open Access CC-BY-4.0.
Description
Keywords
Neutrons, Spectroscopy, Polymers, Temperature range, Materials, Glass, Protons, Oscillations, Molecular dynamics method, Quasi-elastic scattering
Citation
Bichler, K. J., Jakobi, B., Sakai, V. G., Klapproth, A., Mole, R. A., & Schneider, G. J. (2021). Universality of time–temperature scaling observed by neutron spectroscopy on bottlebrush polymers. Nano Letters, 21(10), 4494-4499. doi:1021/acs.nanolett.1c01379