TEMPO Containing Polynorbornene Block Copolymers Prepared via ROMP and Their use as Scaffolds in Sol/Gel-Process |
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| Authors: | Onur Kir Nicola Hüsing Dirk Enke Wolfgang H. Binder |
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| Affiliation: | 1. Martin-Luther University Halle Wittenberg, Faculty of Natural Sciences II/Institute of Chemistry Macromolecular Chemistry /TGZ III, Heinrich Damerow Strasse 4 D-06120 Halle (Saale), Germany;2. University of Ulm, Institut für Anorganische Chemie I, Albert-Einstein-Allee M, 89081 Ulm Germany;3. Martin Luther University Halle-Wittenberg Institute of Technical Chemistry, Department of Chemistry D-06099 Halle (Saale) Germany |
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| Abstract: | Summary: Block copolymers ( B 50 T 30 and B 21 T 30) containing free nitroxide-radicals with two different chain lengths derived from the monomers (+/−) endo,exo-bicyclo[2,2,1]-hept-5-ene-2,3-dicarboxylic acid-bis-O-tert.-butyl ester ( monomer B ) and (+/−)endo,exo-bicyclo[2,2,1]-hept-5-ene-2,3-dicarboxylic acid-bis-O-2,2,6,6-piperidinoxyl-ester ( monomer T ) were polymerized via ring opening metathesis polymerization (ROMP). The ter.-butyl-moiety in block B could then be hydrolyzed to obtain amphiphilic block copolymers which were used as scaffolds in subsequent sol/gel-process. The resulting block copolymers were analyzed via small angle X-Ray scattering (SAXS) to investigate microphase separation and the sol/gel products were analyzed by X-Ray Diffraction (XRD) to prove the formation of ordered TiO2 crystals. |
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| Keywords: | block copolymers ROMP sol/gel TEMPO titanium dioxide |
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