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The Effect of Persistent TEMPO Radicals on the Gilch Polymerization
Authors:Jens Wiesecke  Matthias Rehahn
Abstract:The mechanism of the Gilch polymerization leading to poly(p‐phenylene vinylenes) is still a matter of controversial discussion. Similar to some other research groups, we strongly favor a basically radical process. Moreover, we believe it is initiated by spontaneously formed diradicals. Here, we describe further experimental evidence which clearly supports the assumed initiation step: it is shown how the polymerization process is affected quantitatively when different amounts of 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) are added as a scavenger. In full agreement with our expectations, the chain growth is either retarded or completely prevented, depending on the respective molar ratio of monomer and scavenger.
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Keywords:conducting polymers  Gilch reaction  light‐emitting diodes (LED)  poly(p‐phenylene vinylenes) (PPV)  reaction mechanism
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