Chain dynamics of alternating polymers P(CnEG4)

Karin J Bichler; Bruno Jakobi; Gerald J Schneider

doi:10.1088/1361-648X/ad443f

Chain dynamics of alternating polymers P(C_nEG₄)

J Phys Condens Matter. 2024 May 9;36(31). doi: 10.1088/1361-648X/ad443f.

Authors

Karin J Bichler¹, Bruno Jakobi¹, Gerald J Schneider^{1

2}

Affiliations

¹ Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, United States of America.
² Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States of America.

PMID: 38670126
DOI: 10.1088/1361-648X/ad443f

Abstract

Alternating or sequence defined polymers attract the attention of an increasing number of researchers recently. Due to their different blocks, they are very customizable and material properties can be tuned. In this publication, we present dynamical studies with focus on polymer dynamics, investigated by rheology and fast field cycling (FFC) NMR. The molecular weight dependencies of the relaxation time and zero-shear viscosity could hint to entanglement effects; however, the spectral shape of the viscoelastic data resembles the polymer dynamics of unentangled melts. Taking both techniques into account, i.e. rheology and FFC NMR leads to the conclusion that the relaxation spectra of the alternating polymer are similar to those of linear polymers.

Keywords: alternating polymer; dynamics; fast field cycling NMR; rheology.