| 摘要 |
A polymerization process for styrene derivatives in which a styrene monomer is placed in contact with a catalyst system in a solvent, including at least: a) an alkaline derivative (I) and b) an alkyl magnesium derivative (II) represented by the formulae:<paragraph lvl="0"><in-line-formula>*R-X-Mt (I)</in-line-formula>where R is an alkyl, cycloalkyl or aryl group, possibly replaced, and also able to carry heteroatoms such as O, N, or S, or a carbon atom; and where Mt is an alkaline metal or alkaline earth metal, and<paragraph lvl="0"><in-line-formula>*R'-Mg-X-R'' (II)</in-line-formula>where R' and R'' are alkyl, cycloalkyl or aryl groups, possibly replaced, and also able to carry heteroatoms; X is a heteroatom such as O, N, or S, or a carbon atom, and Mg is an atom of magnesium. This process is able to control group stereoregularity in a range that moves gradually from structures with a strong isotactic tendency to those with a strong syndiotactic tendency.
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