| 초록 |
There has been considerably interested in recent years in polymerizations that exploit ring-chain equilibria, i.e., the equilibria between macrocyclic oligomers (MCOs) and the corresponding linear polymers. In this study, we reported the new polymerization method of high-performance thermoplastics using ring opening polymerizations (ROPs) of MCOs. The ROPs of MCOs may provide an easy method of controlling the morphology and polymer sequence. We successfully synthesized a various series of MCOs in high yield by reaction of difunctional monomers under pseudo-high-dilution conditions. The MCOs ranged in size from the cyclic dimer up to at least the cyclic heptamer. Treatment of a concentrated solution of the MCOs in dimethyl sulfoxide resulted in efficient ring-opening polymerizations to give PAIs / PEISs / PEASs, characterized by FT-IR, 1H-NMR, GPC, XRD. As a result, at high MCOs concentration and low conversion stage, polymerization process was proceeding as living anion polymerization. |
