Translation-Rotation Paradox for Diffusion in Glass-Forming Polymers: The Role of the Temperature Dependence of the Relaxation Time Distribution

Effects of Viscosity on a Thick Circular Plate in Thermoelastic Diffusion Medium

The problem treated here is to determinethe viscosity effect on stresses, temperature change and chemical potential in a circular plate. The mathematical formulation is applied to two theories of thermoelastic diffusion developed by Sherief et al. [27] with one relaxation time and Kumar and Kansal [9]with two relaxation times. Laplace and Hankel transform techniques are used to obtain the expre...

Modeling the collective relaxation time of glass-forming polymers at intermediate length scales: application to polyisobutylene.

In a recent paper [V. N. Novikov, K. S. Schweizer, and A. P. Sokolov, J. Chem. Phys. 138, 164508 (2013)] a simple analytical ansatz has been proposed to describe the momentum transfer (Q) dependence of the collective relaxation time of glass-forming systems in a wide Q-range covering the region of the first maximum of the static structure factor S(Q) and the so-called intermediate length scale ...

Heterogeneous dynamics of the three dimensional Coulomb glass out of equilibrium

The non-equilibrium relaxational properties of a three dimensional Coulomb glass model are investigated by kinetic Monte Carlo simulations. Our results suggest a transition from stationary to non-stationary dynamics at the equilibrium glass transition temperature of the system. Below the transition the dynamic correlation functions loose time translation invariance and electron diffusion is ano...

The dependence of the modulus of elasticity on reference temperature in the theory of generalized thermoelastic diffiusion with one relaxation time

Probe Size Dependent Rotational Dynamics in Polymer by Single Molecule Spectroscopy

1. Introduction A drastic slowdown of the dynamics of a liquid close to its glass transition temperature is observed in many different materials ranging from simple molecular glass formers to complex synthetic polymers. The non-exponential relaxation dynamics and non-Arrhenius type of temperature dependence of mean relaxation times has been observed by many ensemble techniques such as EPR, NMR ...