| 초록 |
Polyisocyanates have interesting properties, such as liquid crystal, helical, and degradable properties. In a decade, servral researches are carried out for the synthesis of polyisocyanates, however, there were no living behavior in anionic polymerization. Recently, in our group, the living anionic polymerization was carried out sucssefully. In the first step, when we used crown ether as an additive, the living character was found. But the crown ether separated from the amidate anion, so, the propagation reaction is very fast. In the second step, the living character was found with new additive, sodium tetra phenyl borate. It was well used for preparation of some polyisocyanates and block copolymers with polyisocyanates. In this paper, we present some living polymerizations system using weak initiators such as, sodium benzanilide, sodium deoxybenzoin, sodium diphenylamine. |
