title: Influence of grafting on the glass transition temperature of PS thin films.
abstract: We present an investigation of the effect of the interaction between a thin polystyrene film and its supporting substrate on its glass transition temperature ([Formula: see text]). We modulate this interaction by depositing the film on end-tethered polystyrene grafted layers of controlled molecular parameters. By comparing [Formula: see text] measurements versus film thickness for films deposited on different grafted layers and films deposited directly on a silicon substrate, we can conclude that there is no important effect of the film-subtrate interaction. Our interpretation of these results is that local orientation and dynamic effects substantial enough to influence [Formula: see text] cannot readily be obtained by grafting prepolymerized chains to a surface, due to intrinsic limitation of the surface grafting density.
authors.affiliation: Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France.
authors.forename: Marceau
authors.initials: M
authors.lastname: Hénot
authors.affiliation: Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France.
authors.forename: Alexis
authors.initials: A
authors.lastname: Chennevière
authors.affiliation: Univ Lyon, Université Lyon 1, CNRS, Ingénierie des Matériaux Polymères, UMR 5223, F-69003, Lyon, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Drockenmuller
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, 60208, Evanston, Illinois, USA.
authors.forename: Kenneth
authors.initials: K
authors.lastname: Shull
authors.affiliation: Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France.
authors.forename: Liliane
authors.initials: L
authors.lastname: Léger
authors.affiliation: Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Restagno
keywords: Soft Matter: Polymers and Polyelectrolytes