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My Study 1. purpose Today, polymeric materials are used in various scenes, many of those are synthesized by radical polymerization. In radical polymerization, neutral radicals with high activity are used as growth species, and it is possible to polymerize various vinyl compounds. On the other hand, it is considered that radical polymerization does not proceed exceptionally with vinyl ether because of instability of growing radicals. So polymers of vinyl ether have been synthesized by cationic polymerization. However, recently, it is reported that Hydroxyl-Functional vinyl ethers proceed radical polymerization in our laboratory. The reason is because the electron donating ability of the oxygen atom adjacent to the vinyl group is decreased and side reactions which inhibit the progress of radical polymerization are suppressed by forming hydrogen bonds between monomers. Hydroxyl functional vinyl ethers are utilized for the synthesis of polymers with thermo responsiveness and nanoparticles with hydroxyl group in their shells, and they play an important role in the synthesis of functional polymers. 2. describe I attempted copolymerization of Hydroxy-Functinal vinyl ether (HEVE) and vinyl ether which doesn’t have hydroxy group (MOVE), based on the idea that hydrogen bonding between monomers promotes radical polymerization. These monomers were mixed at an arbitrary molar ratio, and an initiator was added so that the concentration of the initiator to the monomer concentration became 1/500, and polymerization was carried out at 70 °C,for 48 hours. 3. result In polymerization of MOVE alone, the conversion was 30.7% and the molecular weight was 6700. However, as the feed ratio of HEVE increases, the conversion and molecular weight increase. However, as the feed ratio of HEVE increased, the conversion and molecular weight increased and when the molar ratio of HEVE: MOVE was 8: 2, the conversion was 71.1% and the molecular weight was about 28000. When the feed ratio of HEVE and MOVE is 1: 1, the composition ratio of the polymer obtained is 1: 1, so I think that HEVE and MOVE form a complex, and measureed chemical shift change of MOVE by 1H NMR . The result shows that 1: 1 complex is formed. This result shows that the polymerization was promoted by hydrogen bonding formed between the hydroxyl group of HEVE and the oxygen atom adjacent to the vinyl group of MOVE. It is necessary to further study whether other monomers are also applicable. |