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CPP: Chemische Physik und Polymerphysik
CPP 1: Special Symposium: Molecular Dynamics in Confined Geometries
CPP 1.6: Hauptvortrag
Montag, 2. April 2001, 16:30–17:15, 3010
Properties of Glassy Thin Polymer Films — •Günter Reiter — ICSI, Mulhouse, France
I will present experimental results on the wetting properties
and the apparent glass transition temperature of ultrathin
polymer films on variously treated silicon substrates. The main
focus will be on what are the consequences of film preparation
and the resulting non-equilibrium conformations of the polymers
on
a) measurements of the glass transition temperature in thin films
b) wettability of films much thinner than the unperturbed size of
the polymers
c) measurements of the chain dimensions parallel to the surface
and the observed annealing effects
d) rupture of polystyrene films below about 100 nm although the
Hamaker constant has the wrong sign and films should be metastable
e) specific density of polymers in thin films
Results on polystyrene are compared with the behavior of
polydimethylsiloxane
films which are not undergoing a glass transition during film
preparation. I also will discuss the consequences non-equilibrium
conditions of polymers confined in thin films may have for the
interpretation of published work on this subject.