The main reasons for the formation of intermolecular associates of conjugated polymers have been considered. It was found that paramagnetic centres play a determining role in these processes. Their role amounts to the formation of weak chemical bonds. Possible mechanisms of formation of the paramagnetic centres were discussed. It is thought that a determining role is played by the formation of biradicals and by thermal occupation of low energy triplet levels. The local activation effect is thought to consist in the removal of the prohibition of singlet-triplet transitions in the course of the reaction.
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