Abstract
We present the results of dielectric measurements for three sizable glass-formers with identical nonpolar cores linked to various dipole-labeled rotors that shed new light on the picture of reorientation of anisotropic systems with significant moment of inertia revealed by broadband dielectric spectroscopy. The dynamics of sizable glass-formers formed by partially rigid molecular cores linked to small polar rotors in many respects differs from that of typical glass-formers. For instance, the extraordinarily large prefactors (τ0 > 10–12 s) in the Vogel–Fulcher–Tammann equation were found. The rich and highly diverse relaxation pattern was governed by the location of a dipole, its ability to rotate freely, and the degree of coupling to the motion of the entire sizable system.
Highlights
We present the results of dielectric measurements for three sizable glass-formers with identical nonpolar cores linked to various dipole-labeled rotors that shed new light on the picture of reorientation of anisotropic systems with significant moment of inertia revealed by broadband dielectric spectroscopy
Molecular dynamics of sizable molecules composed of many atoms arranged in a structure with rigid and flexible subunits represent a fundamental problem with significant technological implications
We have proposed a new concept of sizable glassforming materials[7,8] with structural features corresponding to those found in applicable tempting materials but at the same time allowing reference to the fundamental issues related to the reorientation dynamics of large, anisotropic, partially planar, and rigid molecular systems
Summary
We present the results of dielectric measurements for three sizable glass-formers with identical nonpolar cores linked to various dipole-labeled rotors that shed new light on the picture of reorientation of anisotropic systems with significant moment of inertia revealed by broadband dielectric spectroscopy. Such an idealized model perfectly illustrates that, from the dynamics perspective, the sizable systems offer the unique combination of molecular motions on various scales involving whole molecule reorientations (i) and internal rotations (ii).
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