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000007927 0247_ $$2DOI$$a10.1021/ma902213p
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000007927 084__ $$2WoS$$aPolymer Science
000007927 1001_ $$0P:(DE-Juel1)VDB80715$$aHübner, E.$$b0$$uFZJ
000007927 245__ $$aSynthesis of polymer/silica hybrid nanoparticles using anionic polymerization techniques
000007927 260__ $$aWashington, DC$$bSoc.$$c2010
000007927 300__ $$a856 - 867
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000007927 520__ $$aWe report a new "grafting to" technique for the functionalization of silica particles with anionically produced polymers. It is based on it two-step procedure. In the first step the silica nanoparticles were modified with multifunctional chlorosilanes. This procedure allows replacing the original Si-OH surface groups by Si-Cl groups. In the second step the anionically synthesized polymers were linked to the Si-Cl functionalized nanoparticle surface. Both the chlorosilane functionalization of the nanoparticles and the subsequent reaction with living polymer can be carried out without irreversible particle aggregation. This was proved by examining the reaction products with static and dynamic light scattering as well as small-angle X-ray scattering. The polymer linking event is accompanied by termination reactions, most likely due to residual Si-OH groups. Therefore the raw products were purified by a simple fractionation procedure. The examination of the products by size exclusion chromatography showed that this procedure allowed removing the free polymer quantitatively. The new anionic based method offers the possibility for grafting densities Lip to 1 chain per nm(2) of particle surface, which is significantly higher than reported in the past for other "grafting to" approaches. The now obtained grafting densities are similar to the ones reported for "grafting from" techniques which are mainly based oil controlled radical polymerization. Our new approach offers the possibility to obtain hybrid materials containing polymers which are not accessible via controlled radical techniques like polydienes. In addition, the new technique allows grafting polymers having molecular weights up to 500 000 g/mol and still narrow molecular weight distributions.
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000007927 7001_ $$0P:(DE-Juel1)130501$$aAllgaier, J.$$b1$$uFZJ
000007927 7001_ $$0P:(DE-Juel1)VDB2821$$aMeyer, M.$$b2$$uFZJ
000007927 7001_ $$0P:(DE-Juel1)130986$$aStellbrink, J.$$b3$$uFZJ
000007927 7001_ $$0P:(DE-Juel1)VDB4207$$aPyckhout-Hintzen, W.$$b4$$uFZJ
000007927 7001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b5$$uFZJ
000007927 773__ $$0PERI:(DE-600)1491942-4$$a10.1021/ma902213p$$gVol. 43, p. 856 - 867$$p856 - 867$$q43<856 - 867$$tMacromolecules$$v43$$x0024-9297$$y2010
000007927 8567_ $$uhttp://dx.doi.org/10.1021/ma902213p
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000007927 9131_ $$0G:(DE-Juel1)FUEK415$$bStruktur der Materie$$kP55$$lGroßgeräteforschung mit Photonen, Neutronen und Ionen$$vGroßgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI)$$x1
000007927 9132_ $$0G:(DE-HGF)POF3-623$$1G:(DE-HGF)POF3-620$$2G:(DE-HGF)POF3-600$$aDE-HGF$$bForschungsbereich Materie$$lIn-house research on the structure, dynamics and function of matter$$vNeutrons for Research on Condensed Matter$$x0
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