Dynamical Comparison of Different Polymer Architectures—Bottlebrush vs Linear Polymer

Different polymer architectures behave differently regarding their dynamics. We have used a combination of dielectric spectroscopy, and fast field cycling nuclear magnetic resonance (NMR) to compare the dynamical behavior two different architectures, with similar overall molecular weight. The systems interest are bottlebrush linear one, both based on poly(dimethylsiloxane) (PDMS). To verify structure PDMS-g-PDMS in melt, small-angle neutron scattering was used, yielding spherical shape. Information about segmental dynamics revealed by spectroscopy extended higher temperatures NMR. One advantage NMR is detection large-scale chain dynamics, which cannot probe for PDMS. While relaxation seems be independent architecture, show substantial differences, as represented mean square displacement. Here, regions detected each polymer. shows Rouse regime, followed reptation. In contrast, performs diffusion available time window, entanglement effects completely missing.