Block Copolymers by Using Combined Controlled Radical and Radical Promoted Cationic Polymerization Methods |
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Authors: | M Attila Tasdelen Mustafa Degirmenci Yusuf Yagci Oskar Nuyken |
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Affiliation: | 1.Istanbul Technical University, Department of Chemistry. Maslak, Istanbul 80626, Turkey, E-mail: yusuf@itu.edu.tr,TR;2.Technische Universit?t München, Lehrstuhl für Makromolekulare Stoffe, Lichtenbergstrasse 4, 85747 Garching, Germany,DE |
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Abstract: | Summary
A novel synthetic procedure for the preparation of block copolymers based on the combination of diphenylethene (DPE) mediated
controlled radical polymerization and radical promoted cationic polymerization is described. In the first step, the controlled
polymerization of styrene (St) and methyl methacrylate (MMA) in presence of DPE yields polymers with various structures of
diphenylethyl units in the main chain. Upon heating these prepolymers undergo scission to give polymeric radicals. Oxidation
of these radicals by onium salts such as diphenyliodonium heaxfluorophosphate (Ph2I+PF6
−) and N-ethoxy-2-methylpyridinium hexafluorophosphate (EMP+PF6
−) yields reactive cations capable of initiating cationic polymerization of cyclohexene oxide (CHO). Block copolymer structure
was confirmed by IR and NMR spectral measurements and GPC analysis.
Received: 13 December 2002/Revised version: 25 March 2003/ Accepted: 11 March 2003
Correspondence to Yusuf Yagci |
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