| 초록 |
Cyclopolymerization is a type of chain-growth addition polymerization that leads to cyclic structure in the polymer main chain via an alternating intramolecular-intermolecular chain propagation. The fluorene-containing spiro-type conjugated polymers, poly(dipropargylfluorene) and its homologues(2-bromo, 2-acetyl, 2-nitro), were prepared by the ring-forming cyclopolymerization of dipropargylfluorene and its homologues by Mo-, W-, and Pd- based catalyst systems. In the polymerization of dipropargylfluorene and 2-bromo-9,9-dipropargylfluorene, the MoCl5 itself was found to be very effective catalyst to give a quantitative yield of polymer. On the other hand, the polymerization of the dipropargylfluorene monomers having 2-acetyl and 2-nitro substituents proceeded mildly by the same catalyst to give a moderate yield of polymer. The structure of the resulting poly(dipropargylfluorene) and its homologures were characterized by various instrumental methods (NMR, IR, UV-visible spectroscopies, and elemental analysis) to have the conjugated polymer backbone carrying fluorene moieties. |
