scholarly journals Polystyrene grafting from silica nanoparticles via nitroxide-mediated polymerization (NMP): synthesis and SANS analysis with the contrast variation method

Soft Matter ◽  
2009 ◽  
Vol 5 (19) ◽  
pp. 3741 ◽  
Author(s):  
Chloé Chevigny ◽  
Didier Gigmes ◽  
Denis Bertin ◽  
Jacques Jestin ◽  
François Boué
Keyword(s):  
Silica Nanoparticles ◽  
Variation Method ◽  
Contrast Variation ◽  
Grafting From ◽  
Nitroxide Mediated Polymerization

Neutron diffraction, inelastic scattering and the structure of amphiphiles and macromolecules in solution

1975 ◽  
Vol 345 (1640) ◽  
pp. 119-144 ◽  
Keyword(s):  
Neutron Diffraction ◽  
Inelastic Scattering ◽  
Cross Sections ◽  
Biological Molecules ◽  
Variation Method ◽  
Contrast Variation ◽  
Structure And Dynamics ◽  
Spin Resonance ◽  
Scattering Lengths ◽  
Scattering Cross Sections

The methods by which neutron diffraction and inelastic scattering may be used to study the structure and dynamics of solutions are reviewed, with particular reference to solutions of amphiphile and biological molecules in water. Neutron methods have particular power because the scattering lengths for protons and deuterons are of opposite sign, and hence there exists the possibility of obtaining variable contrast between the scattering of the aqueous medium and the molecules in it. In addition, the contrast variation method is also applicable to inelastic scattering studies whereby the dynamics of one component of the solution can be preferentially studied due to large and variable differences in the scattering cross sections. Both applications of contrast variation are illustrated with examples of amphiphile-water lamellar mesophases, diffraction from collagen, viruses, and polymer solutions. Inelastic scattering observations and the dynamics of water between the lamellar sheets allow microscopic measurements of the water diffusion along and perpendicular to the layers. The information obtained is complementary to that from nuclear magnetic resonance and electron spin resonance studies of diffusion.

Nitroxide-Mediated Polymerization of Styrene Initiated from the Surface of Silica Nanoparticles. In Situ Generation and Grafting of Alkoxyamine Initiators

2005 ◽  
Vol 38 (4) ◽  
pp. 1099-1106 ◽  
Author(s):  
C. Bartholome ◽  
E. Beyou ◽  
E. Bourgeat-Lami ◽  
P. Chaumont ◽  
F. Lefebvre ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
In Situ Generation ◽  
Nitroxide Mediated Polymerization

Hollow polymer nanocapsules with ferrocenyl copolymer shell

2021 ◽  
Author(s):  
Moumita Dhara ◽  
Somdatta Rudra ◽  
Nilanjan Mukherjee ◽  
Tushar Jana
Keyword(s):  
Silica Nanoparticles ◽  
Polymer Chains ◽  
One Pot ◽  
Grafting From

Hollow polymer nanocapsules (HPN) consist of ferrocenyl shell have been developed by crosslinking the polymer chains grafted over silica nanoparticles (SiNP) which were synthesized via one pot grafting from surface...

Grafting from Starch Nanoparticles with Synthetic Polymers via Nitroxide‐Mediated Polymerization

2019 ◽  
Vol 40 (10) ◽  
pp. 1800834 ◽  
Author(s):  
Jaime C. Cazotti ◽  
Alexander T. Fritz ◽  
Omar Garcia‐Valdez ◽  
Niels M. B. Smeets ◽  
Marc A. Dubé ◽  
...  
Keyword(s):  
Synthetic Polymers ◽  
Starch Nanoparticles ◽  
Grafting From ◽  
Nitroxide Mediated Polymerization

scholarly journals Silica-Polystyrene Nanocomposite Particles Synthesized by Nitroxide-Mediated Polymerization and Their Encapsulation through Miniemulsion Polymerization

2006 ◽  
Vol 2006 ◽  
pp. 1-10 ◽  
Author(s):  
Bérangère Bailly ◽  
Anne-Carole Donnenwirth ◽  
Christèle Bartholome ◽  
Emmanuel Beyou ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Silica Nanoparticles ◽  
Functional Group ◽  
Silica Surface ◽  
Miniemulsion Polymerization ◽  
Molecular Weights ◽  
Transmission Electron ◽  
Shell Particles ◽  
Terminal Functional Group ◽  
Nitroxide Mediated Polymerization

Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000g⋅mol-1and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide-mediated polymerization (NMP). Alkoxyamine initiators based on N-tert-butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (DEPN) and carrying a terminal functional group have been synthesized in situ and grafted to the silica surface. The resulting grafted alkoxyamines have been employed to initiate the growth of polystyrene chains from the inorganic surface. The maximum grafting density of the surface-tethered PS chains was estimated and seemed to be limited by initiator confinement at the interface. Then, the PS-grafted Stöber silica nanoparticles were entrapped inside latex particles via miniemulsion polymerization. Transmission electron microscopy indicated the successful formation of silica-polystyrene core-shell particles.

Local Aspects of Non-Elastic Deformation in Atactic Glassy Polystyrene

1986 ◽  
Vol 79 ◽  
Author(s):  
G. Coulon ◽  
J. M. Lefebvre ◽  
M. Rawiso
Keyword(s):  
Elastic Deformation ◽  
Monomer Unit ◽  
Shear Banding ◽  
Variation Method ◽  
Isotopic Labelling ◽  
Contrast Variation ◽  
Phenyl Rings ◽  
Thin Thread ◽  
Chemical Resolution ◽  
Different Parts

AbstractAtactic glassy polystyrene has been deformed by shear banding. The influence of the macroscopic shear stress down to a scale smaller than the dimensions of the macromolecules has been investigated by small-angle neutron scattering. The chemical resolution has been improved by using isotopic labelling on different parts of the monomer unit. The analysis of the experimental scattering curves has been made according to the thin thread model with a superimposed thickness. On the other hand, the contrast variation method has been applied in order to determine both the structure factor of the phenyl rings and that of the backbone part of the chain. This allows us to precise the influence of non-elastic deformation on the local structure of the chain.

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