Large-scale synthesis of cyclic vinyl polymers by a ring-expansion polymerization

在本研究中，一个有效的和大规模的合成环状乙烯基聚合物通过使用扩环聚合过程进行了研究。合成了含有具有促进活性自由基聚合潜力的功能单元的环状化合物。乙烯基单体的聚合，即，苯乙烯或甲基丙烯酸甲酯与这些环状化合物在各种条件下进行了研究，并对所得聚合物进行了表征。虽然得到了环状聚合物，但在聚合过程中发生了分子间反应，得到较大环尺寸的产物作为主要产物。 所得环状聚合物具有多个聚合位点，将用于多嵌段聚合物的新型合成。

In this research an efficient and large-scale synthesis of cyclic vinyl polymers by using a ring-expansion polymerization process was investigated. Cyclic compounds containing a functional unit that has potential to promote living radical polymerization were synthesized. Polymerizations of vinyl monomers, i.e., styrene or methyl methacrylate, with these cyclic compounds were investigated under various conditions and the obtained polymers were characterized. Although cyclic polymers were obtained, an intermolecular reaction was occurred during the polymerization to give larger ring-size products as a major product. The obtained cyclic polymers, having plural polymerization sites, will be used for a novel synthesis of multi-block polymers.