DOI: 10.1051/jp2:1993142
J. Phys. II France 3 (1993) 443-448
Surface-tethered polymers in polymeric matrices
Miguel Aubouy and Elie RaphaëlLaboratoire de Physique de la Matière Condensée, URA 792 CNRS, Collège de France, 11 Place Marcelin-Berthelot, 75231 Patis Cedex 05, France
(Received 30 November 1992, accepted 29 January 1993)
Abstract
Recently Budkowski et al. used nuclear reaction analysis to study polymer brushes consisting of end-tethered deuterated polystyrene tails within a
polystyrene homopolymer matrix. They measured the concentration-depth profile as a function of the surface coverage
of tails and the degree of polymerisation of the matrix. For the matrix with the largest degree of polymerisation, the variation
of the effective brush thickness
L with
can be fitted by the apparent power law
with
. This scaling law is not expected theoretically for surface-tethered polymers exposed to a polymeric matrix consisting of
chemically identical chains (
, where
is the interaction parameter). in the present note we would like to propose an explanation based on the fact that mixtures
of deuterated and protonated polystyrene chains are characterized by a small (but non-zero) value of
.
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