Abstract
AbstractThe anionic polymerization of methyl methacrylate was carried out in the presence of Bu2Mg/quaternary ammonium salts in toluene at 0°C. It was found that the bulkiness and shape of the salt strongly affect the polydispersity and tacticity of the resulting polymers. Molecular weight distribution is in the range 1.3 <M>w/Mn 4.7.>Tetrahexylammonium chloride causes the most drastic change in the tacticity. The structure of R4MNX, as well as the nature of the metal and the t‐BuOLi ligands produce a radical effect on the polymer properties. These initiator components perform their role by changing the microenvironment of the ligated and aggregated growing chains. The results clearly reveal the great potential of the mixed associate or mixed base as strong stereospecific initiator systems.
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