The storage of freshly prepared poly(2‐vinylpyridyl)lithium (PVPLi) in toluene at ‐20°C leads to the formation of the modified agent (PVPLi)m which ensures an enhanced efficiency of the block copolymerization of living PVP chains with acrylonitrile and methyl methacrylate. The conditions of block copolymer synthesis are described, the mechanism of the investigated processes is discussed.
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