  In this article, we present new samples of lamellar magnetic nanocomposites
based on the self-assembly of a polystyrene-b-poly(n-butyl methacrylate)
diblock copolymer synthesized by atom transfer radical polymerization. The
polymer films were loaded with magnetic iron oxide nanoparticles covered with
polystyrene chains grown by surface initiated-ATRP. The nanostructuration of
the pure and magnetically loaded copolymer films on silicon was studied by
atomic force microscopy, ellipsometry, neutron reflectivity and contact angle
measurement. The present study highlights the strong influence of the copolymer
extremity - driven itself by the choice of the ATRP chemical route - on the
order of the repetition sequences of the blocks in the multi-lamellar films. In
addition, a narrower distribution of the nanoparticles' sizes was examined as a
control parameter of the SI-ATRP reaction.
