End block dynamics in unentangled polymers by dielectric spectroscopy

Wu, Mengchun; Bichler, Karin J.; Jakobi, Bruno; Grzesiowski, Alyssa; Schneider, Gerald J.

doi:10.1088/1361-648x/acdbf7

End block dynamics in unentangled polymers by dielectric spectroscopy

Journal Article · Thu Jun 15 00:00:00 EDT 2023 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648x/acdbf7· OSTI ID:2271669

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Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University
Louisiana State Univ., Baton Rouge, LA (United States)
Syracuse Univ., NY (United States)

Dielectric spectroscopy measures the dynamics of polymer melts over a broad frequency range. Developing a theory for the spectral shape can extend the analysis of dielectric spectra beyond determining relaxation times from the peak maxima and adds physical meaning to shape parameters determined with empirical fit functions. Toward this goal, we use the experimental results on unentangled poly(isoprene), and unentangled poly(butylene oxide), polymer melts, to test whether the concept of end blocks could be one reason for the Rouse model deviating from experimental data. These end blocks have been suggested by simulations and neutron spin echo spectroscopy and are a consequence of the monomeric friction coefficient depending on the position of the bead in the chain. The concept of an end block is an approximation which partitions the chain in a middle and two end blocks to avoid overparameterization by a continuous position dependent change of the friction parameter. Analysis of dielectric spectra shows that the deviations of the calculated from the experimental normal mode cannot be related to the end block relaxation. However, the results do not contradict an end block hiding below the segmental relaxation peak. Finally, it seems that the results are compatible with an end block being the specific part of the sub-Rouse chain interpretation close to the chain ends.

View Accepted Manuscript (DOE)

Research Organization:: Louisiana State University, Baton Rouge, LA, United States

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

Grant/Contract Number:: SC0019050

OSTI ID:: 2271669

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 37 Vol. 35; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
dielectric spectroscopy
dynamics
end block dynamics
polymer melts

End block dynamics in unentangled polymers by dielectric spectroscopy

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