The objective is to understand
the dynamics of chains in different confined systems. These
studies are of great practical interest due to the relationship
between chain dynamics and molecular mechanisms of adhesion and
friction at interfaces. We therefore aim to measure the influence
of confinement on polymer chain movement and how this changes
with distance from interfaces and surfaces.
Molecular dynamics computer
simulations will be performed to study segmental relaxation,
relaxation of density fluctuations, and chain diffusion. These
models can be tested using experimental techniques that can study
chain movement include dielectric relaxation, and NMR.
Fluorescence recovery after
fringe pattern photobleaching (FRAPP), and near field laser
velocimetry will give access to polymer chain centre of mass
diffusion coefficients. The JKR test will be used to measure
adhesive properties. JKR combined with shear will be used to
measure friction. Adhesion enhancement kinetics and friction
behaviour of grafted chains will be used as tests of confinement
effects on the dynamics of the chains.
Many of these techniques will
reveal similar information; we shall therefore use, wherever
possible, the same systems for a direct comparison between the
results obtained.
More details:
Professor Michael
Wübbenhorst at the Catholic University Leuven is in
overall charge of this element of the programme.
