[HTML][HTML] Universal properties of relaxation and diffusion in complex materials: Originating from fundamental physics with rich applications

KL Ngai - Progress in Materials Science, 2023 - Elsevier
Complex materials are composed of basic units which invariably interact with anharmonic
potentials. It is well known that the dynamics of systems with anharmonic interaction are …

Supercooled dynamics of glass-forming liquids and polymers under hydrostatic pressure

CM Roland, S Hensel-Bielowka… - Reports on Progress …, 2005 - iopscience.iop.org
An intriguing problem in condensed matter physics is understanding the glass transition, in
particular the dynamics in the equilibrium liquid close to vitrification. Recent advances have …

Do theories of the glass transition, in which the structural relaxation time does not define the dispersion of the structural relaxation, need revision?

KL Ngai, R Casalini, S Capaccioli… - The Journal of …, 2005 - ACS Publications
Upon decreasing temperature or increasing pressure, a noncrystallizing liquid will vitrify; that
is, the structural relaxation time, τ α, becomes so long that the system cannot attain an …

The role of chain-end association lifetime in segmental and chain dynamics of telechelic polymers

K **ng, M Tress, PF Cao, F Fan, S Cheng… - …, 2018 - ACS Publications
Broadband dielectric spectroscopy, differential scanning calorimetry, and rheology were
employed to study the impact of hydrogen (H)-bonding end-groups on segmental and chain …

Effect of hydrostatic pressure on the viscoelastic response of polyurea

CM Roland, R Casalini - Polymer, 2007 - Elsevier
Dielectric spectroscopy is used to measure the local segmental relaxation times for the soft
segments of a polyurea as a function of temperature and pressure. In combination with the …

Studies on the Temperature and Time Induced Variation in the Segmental and Chain Dynamics in Poly (propylene glycol) Confined at the Nanoscale

M Tarnacka, K Kaminski, EU Mapesa… - …, 2016 - ACS Publications
The effect of 2D confinement on the dynamics of the normal mode (chain mobility) and
segmental relaxation in poly (propylene glycol)(PPG) has been studied with the use of …

Excess wing in the dielectric loss spectra of propylene glycol oligomers at elevated pressure

R Casalini, CM Roland - Physical Review B, 2004 - APS
Dielectric loss spectra at both ambient and elevated pressure are presented for propylene
glycol (PG), dipropylene glycol, and tripropylene glycol. While in previous literature the …

A dielectric study of oligo-and poly (propylene glycol)

C Gainaru, W Hiller, R Bohmer - Macromolecules, 2010 - ACS Publications
The segmental and normal mode dynamics of poly (propylene glycol)(PPG) were studied
using dielectric spectroscopy for a wide range of molecular weights. For intermediate chain …

Thermodynamic scaling of vibrational dynamics and relaxation

F Puosi, O Chulkin, S Bernini, S Capaccioli… - The Journal of …, 2016 - pubs.aip.org
We investigate by thorough molecular dynamics simulations the thermodynamic scaling (TS)
of a polymer melt. Two distinct models, with strong and weak virial-energy correlations, are …

Temperature and density effects on the local segmental and global chain dynamics of poly (oxybutylene)

R Casalini, CM Roland - Macromolecules, 2005 - ACS Publications
Dielectric spectroscopy measurements over a broad range of temperature and pressure
were carried out on poly (oxybutylene)(POB), a type A polymer (dielectrically active normal …