We investigated by dielectric relaxation spectroscopy the distribution of glass transition temperatures and dielectric relaxation strength inside ultrathin polymer films capped between metallic layers. Measurements of the local dielectric properties were achieved by selectively placing layers of dye-labeled polystyrene at different depth inside films of neat polystyrene of different thickness. We show experimental evidence for an interfacial nature of the deviations from bulk behavior; in particular, the value of the dielectric strength and the glass transition temperature strongly depend on the distance from the solid interface. These peculiar profiles of static and dynamic dielectric properties are discussed in terms of a physical picture...
The local and cooperative dynamics of supported ultrathin films (L = 6.4 - 120 nm) of isotactic poly...
The influence of interfacial interactions and annealing time on dynamics of the α-relaxation in ultr...
We perform molecular dynamics Simulations to study the dielectric relaxation of a head-spring model ...
Dielectric measurements of ultrathin polymer layers capped between metallic electrodes revealed, bes...
The aim of this dissertation is to investigate the influence of interfacial interactions on the dyna...
A new experimental method taking advantage of the sensitivity of dielectric spectroscopy (DS) and be...
The effect of confinement on structural relaxation in ultrathin poly(vinyl acetate) films has been s...
The effect of confinement on structural relaxation in ultrathin poly(vinyl acetate) films has been s...
The local and cooperative dynamics of supported ultra-thin films (L = 4 – 170 nm) of poly(methyl met...
This thesis presents experiments aimed at understanding more about the dynamics of polymer chains wh...
The structural dynamics of ultrathin polymer films of poly(ethylene terephthalate) capped between al...
The structural dynamics of ultrathin polymer films of poly(ethylene terephthalate) capped between al...
The question of whether the glass transition temperature in thin polymer films depends on the film t...
Using dielectric spectroscopy, we probe the structural relaxation processes in thin freely suspended...
The dielectric loss peaks of both normal-mode relaxation (fluctuations of the end-to-end dipole vect...
The local and cooperative dynamics of supported ultrathin films (L = 6.4 - 120 nm) of isotactic poly...
The influence of interfacial interactions and annealing time on dynamics of the α-relaxation in ultr...
We perform molecular dynamics Simulations to study the dielectric relaxation of a head-spring model ...
Dielectric measurements of ultrathin polymer layers capped between metallic electrodes revealed, bes...
The aim of this dissertation is to investigate the influence of interfacial interactions on the dyna...
A new experimental method taking advantage of the sensitivity of dielectric spectroscopy (DS) and be...
The effect of confinement on structural relaxation in ultrathin poly(vinyl acetate) films has been s...
The effect of confinement on structural relaxation in ultrathin poly(vinyl acetate) films has been s...
The local and cooperative dynamics of supported ultra-thin films (L = 4 – 170 nm) of poly(methyl met...
This thesis presents experiments aimed at understanding more about the dynamics of polymer chains wh...
The structural dynamics of ultrathin polymer films of poly(ethylene terephthalate) capped between al...
The structural dynamics of ultrathin polymer films of poly(ethylene terephthalate) capped between al...
The question of whether the glass transition temperature in thin polymer films depends on the film t...
Using dielectric spectroscopy, we probe the structural relaxation processes in thin freely suspended...
The dielectric loss peaks of both normal-mode relaxation (fluctuations of the end-to-end dipole vect...
The local and cooperative dynamics of supported ultrathin films (L = 6.4 - 120 nm) of isotactic poly...
The influence of interfacial interactions and annealing time on dynamics of the α-relaxation in ultr...
We perform molecular dynamics Simulations to study the dielectric relaxation of a head-spring model ...