Mechanism of Stereo Regulation during Anionic Polymerization of Polar Monomers

摘要

Formulation of the problem of the relative role of specific factors, which are basically capable of causing the corresponding effects, is justified in connection with the essential relationship of the micro structure of polymers, which are formed due to the action of anionic initiators, to the nature of the reaction medium. One of them is the change of overall polarity of the medium during the transition from one solvent to another, and the second is a formation of complexes of active reaction centers of growth with components of the medium, which have electron donor properties. In this report we shall limit our examination to the particular but very interesting case, specifically the system of the metal alcyl-polar monomer-non-polar solvent with the inclusion of data obtained in studying the microtactics of polymethylmethacrylic (PMMA), which is formed due to the action of lithium butyl with various ratios of monomer to solvent. The synthesized polymers were studied by infrared and NMR spectroscopy methods.