Polymer-Grafted Magnetic Nanoparticles in Nanocomposites: Curvature Effects, Conformation of Grafted Chain, and Bimodal Nanotriggering of Filler Organization by Combination of Chain Grafting and Magnetic Field

We present the synthesis and structural characterization of new nanocomposites made of linear tetramers of spherical magnetic nanoparticles of maghemite (γ-Fe2O3), grafted by tethered polystyrene (PS) chains with an intermediate grafting density (∼0.15 chains/nm2), dispersed in a PS matrix. First, we studied by combination of SAXS and TEM the dispersion state of the grafted objects within the matrix for various ratio R of the mass of the grafted chains N to the mass of free chains P ranging from R = N/P = 0.09 to R = 2.83. For R 1, the objects are also well dispersed although there are some remaining aggregates, arising probably from the fact that we have used matrix’ chains below the entanglement mass to r...

[1]  J. Ilavsky,et al.  A Phase Diagram for Polymer-Grafted Nanoparticles in Homopolymer Matrices , 2012 .

[2]  Pinar Akcora,et al.  Assembly of Polymer-Grafted Magnetic Nanoparticles in Polymer Melts , 2012 .

[3]  L. Archer,et al.  Tethered nanoparticle-polymer composites: phase stability and curvature. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[4]  D. Gigmes,et al.  Controlled grafted brushes of polystyrene on magnetic γ-Fe2O3 nanoparticlesvianitroxide-mediated polymerization , 2012 .

[5]  F. Müller-Plathe,et al.  Interface and Interphase Dynamics of Polystyrene Chains near Grafted and Ungrafted Silica Nanoparticles , 2012 .

[6]  F. Müller-Plathe,et al.  Interphase Structure in Silica–Polystyrene Nanocomposites: A Coarse-Grained Molecular Dynamics Study , 2012 .

[7]  F. Meneau,et al.  Nanocomposite Materials with Controlled Anisotropic Reinforcement Triggered by Magnetic Self-Assembly , 2011 .

[8]  Pinar Akcora,et al.  Mechanical Reinforcement in Polymer Melts Filled with Polymer Grafted Nanoparticles , 2011 .

[9]  D. Gigmes,et al.  Controlled grafting of polystyrene on silica nanoparticles using NMP: a new route without free initiator to tune the grafted chain length , 2011 .

[10]  D. Gigmes,et al.  Polymer-Grafted-Nanoparticles Nanocomposites: Dispersion, Grafted Chain Conformation, and Rheological Behavior , 2011 .

[11]  David M. Trombly,et al.  Curvature effects upon interactions of polymer-grafted nanoparticles in chemically identical polymer matrices. , 2010, The Journal of chemical physics.

[12]  Olivier Sandre,et al.  Homogeneous Dispersion of Magnetic Nanoparticles Aggregates in a PS Nanocomposite: Highly Reproducible Hierarchical Structure Tuned by the Nanoparticles’ Size , 2010 .

[13]  D. Gigmes,et al.  "Wet-to-Dry" Conformational Transition of Polymer Layers Grafted to Nanoparticles in Nanocomposite , 2010, 1005.1551.

[14]  A. Athanassiou,et al.  Dynamical formation of spatially localized arrays of aligned nanowires in plastic films with magnetic anisotropy. , 2010, ACS nano.

[15]  D. Bedrov,et al.  Dispersing nanoparticles in a polymer matrix: are long, dense polymer tethers really necessary? , 2009, Langmuir : the ACS journal of surfaces and colloids.

[16]  D. Gigmes,et al.  Polystyrene grafting from silica nanoparticles via nitroxide-mediated polymerization (NMP): synthesis and SANS analysis with the contrast variation method , 2009, 1005.1542.

[17]  Linda S. Schadler,et al.  Anisotropic self-assembly of spherical polymer-grafted nanoparticles. , 2009, Nature materials.

[18]  J. Jestin,et al.  Well-Dispersed Fractal Aggregates as Filler in Polymer−Silica Nanocomposites: Long-Range Effects in Rheology , 2009, 0903.5380.

[19]  Xiaorong Wang,et al.  Dispersing hairy nanoparticles in polymer melts , 2008 .

[20]  R. Composto,et al.  Dispersion of polymer-grafted magnetic nanoparticles in homopolymers and block copolymers , 2008 .

[21]  R. Schweins,et al.  Anisotropic Reinforcement of Nanocomposites Tuned by Magnetic Orientation of the Filler Network , 2008, 0904.0857.

[22]  L. Francis,et al.  Silica nanoparticle dispersions in homopolymer versus block copolymer , 2007 .

[23]  Sie Chin Tjong,et al.  STRUCTURAL AND MECHANICAL PROPERTIES OF POLYMER NANOCOMPOSITES , 2006 .

[24]  T. Cosgrove,et al.  Effects of electrolytes on adsorbed polymer layers: poly(ethylene oxide)-silica system. , 2006, Langmuir : the ACS journal of surfaces and colloids.

[25]  Mark Sutton,et al.  Gold nanoparticle/polymer nanocomposites: dispersion of nanoparticles as a function of capping agent molecular weight and grafting density. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[26]  J. Rottler,et al.  Growth, microstructure, and failure of crazes in glassy polymers. , 2003, Physical review. E, Statistical, nonlinear, and soft matter physics.

[27]  H. Fischer.  The persistent radical effect: a principle for selective radical reactions and living radical polymerizations. , 2001, Chemical reviews.

[28]  T. Patten,et al.  Preparation of Structurally Well-Defined Polymer−Nanoparticle Hybrids with Controlled/Living Radical Polymerizations , 1999 .

[29]  J. S. Pedersen,et al.  Scattering form factor of block copolymer micelles , 1996 .

[30]  V. Cabuil,et al.  Preparation and properties of monodisperse magnetic fluids , 1995 .

[31]  A. Gast,et al.  Interactions of sterically stabilized particles suspended in a polymer solution , 1986 .

[32]  P. G. de Gennes,et al.  Conformations of Polymers Attached to an Interface , 1980 .