‘Graft from’ polymerization on colloidal silica particles: elaboration of alkoxyamine grafted surface by in situ trapping of carbon radicals

Inoubli, Rabi; Dagréou, Sylvie; Khoukh, Abdel; Roby, François; Peyrelasse, J.; Billon, Laurent

doi:10.1016/j.polymer.2005.01.032

Cited by 46 publications

(51 citation statements)

References 21 publications

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“…This point can be achieved in principle by grafting a polymer layer onto the surface of the silica particles to constitute model filled polymers. As for example, polybutylacrylate grafted silica nanoparticles [8] have been prepared by alkoxyamine-mediated polymerization, using a method of in situ of carbon radicals. Goel et al [9] grafted styreneeacrylonitrile random copolymers to silica nanoparticles by in situ atom transfer radical polymerization (ATRP).…”

Section: Fumed Silica Nanocompositesmentioning

confidence: 99%

Melt rheology of organoclay and fumed silica nanocomposites

Cassagnau

2008

Polymer

444

323

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The objective of the present work is to investigate, from the open literature, the recent developments in the rheology of silica and organoclay nanocomposites. In particular, this paper focuses on general trends of the linear viscoelastic behaviour of such nanocomposites. Hence, the variations of the equilibrium shear modulus and critical strain (limit of linearity), which depend on power laws of the volume fraction of particles, are discussed as filler fractal structure. In the third section, the strong nonlinearity behaviour (Payne effect) of filled polymers has been discussed in terms of filler nature. Typically two mechanisms arise to depict the linear solid-like behaviour and the Payne effect: particleeparticle interactions is the dominant mechanism in fumed silica nanocomposites whereas particleepolymer interaction is the dominant one in colloidal silica nanocomposites at identical filler concentrations. However, these interactions are balanced in each nanocomposite systems by the silica surface treatments (chain grafting, silane modification) and the molecular weight of the matrix. Finally, we aim to unify the main findings of the literature on this subject, at least from a qualitative point of view.We finally report on the thixotropy and modulus recovery after a large deformation in steady and dynamic shear conditions. Following this, the nonlinear rheological properties of nanocomposite materials have been discussed. The discussion is particularly focused on the effect of flow history (transient shear experiments) on the orientationedisorientation of clay platelets. Actually, the linear and nonlinear rheological properties are consistent with a network structure of a weakly agglomerated tactoids. As far as exfoliated clay nanocomposites are concerned, the interparticle interaction is the dominant effect in the nonlinearity effect.

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Section: Fumed Silica Nanocompositesmentioning

confidence: 99%

Melt rheology of organoclay and fumed silica nanocomposites

Cassagnau

2008

Polymer

444

323

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“…[89] This resulted in an immobilized alkoxyamine that was used for the SIP of butyl acrylate. [90] Shortly after, a similar procedure was published for the SG1-mediated styrene polymerization on surfaces. [91] Access to initiator-covered surfaces 30 in a single step was achieved by reaction of silica particles with a silylated olefin 29 and SG1 in the presence of AIBN (Scheme 11).…”

Section: Initiator Synthesis Directly At the Surfacementioning

confidence: 99%

Polymer Brushes by Nitroxide‐Mediated Polymerization

Brinks

Studer

2009

Macromol. Rapid Commun.

120

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This review article describes the preparation of polymer brushes by nitroxide-mediated radical polymerization using either the 'grafting to' or the 'grafting from' approach. The use of TEMPO as a classical initiator is intensively described. More sophisticated nitroxides are also included in the discussion. Brush formation on flat surfaces such as wafers and also on particles is reported. Finally, some applications of polymer brushes are presented.

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“…These groups often use DLS to characterize layer extensions [40,41], with convincing plots of the growing hydrodynamic thickness during polymerisation [ [52]. In a concentration study, Kohlbrecher et al fit contrast-variation SANS intensities of coated silica spheres in toluene with a core-shell model and an adhesive polydisperse structure factor model [6 • ].…”

Section: Structure Of Peo-layersmentioning

confidence: 99%

Adsorption and grafting on colloidal interfaces studied by scattering techniques

Oberdisse

2007

Current Opinion in Colloid & Interface Science

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The adsorption of polymer and surfactant molecules onto colloidal particles or droplets in solution can be characterized non-destructively by scattering techniques. In a first part, the general framework of Dynamic Light Scattering, Small Angle Neutron and X-ray Scattering for the determination of the structure of adsorbed layers, and namely of the density profile, is presented. We then review recent studies of layers of the model polymer poly(ethylene oxide), as homopolymer or part of a block copolymer. In this field, scattering with contrast variation has been shown to be a powerful tool to obtain a detailed description of the layer structure. Adsorption of chemically more complex systems, including polyelectrolytes, polymer complexes, grafted chains and biomacromolecules are also discussed in this review, as well as surfactant adsorption.

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‘Graft from’ polymerization on colloidal silica particles: elaboration of alkoxyamine grafted surface by in situ trapping of carbon radicals

Cited by 46 publications

References 21 publications

Melt rheology of organoclay and fumed silica nanocomposites

Melt rheology of organoclay and fumed silica nanocomposites

Polymer Brushes by Nitroxide‐Mediated Polymerization

Adsorption and grafting on colloidal interfaces studied by scattering techniques

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