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Cationic ring-opening polymerization of 3,3-bis(chloromethyl)oxacyclobutane catalyzed by BF_3·OEt_2 was carried out in ionic liquids [bmim]BF_4 and [bmim]PF_6.The influences of BCMO concentration and molar ratio of BCMO/BF_3·OEt_2 on the molecular weights and yield of PBCMO were investigated.The polymerization in ionic liquids proceed to high conversions,although molecular weights are limited,similar to polymerization in organic solvent such as CH_2Cl_2.Follow a viewpoint of green chemistry, we feel ionic liquid [bmim]BF_4 is superior to [bmim]PF_6.Extracting [bmim]PF_6 from the product using organic solvent as extractant limits its advantage as a green reaction media.
Cationic ring-opening polymerization of 3,3-bis (chloromethyl) oxacyclobutane catalyzed by BF_3 · OEt_2 was carried out in ionic liquids [bmim] BF_4 and [bmim] PF_6. These influences of BCMO concentration and molar ratio of BCMO / BF_3 · OEt_2 on the molecular weights and yield of PBCMO were investigated. The polymerization in ionic liquids proceed to high conversions, although molecular weights are limited, similar to polymerization in organic solvents such as CH_2Cl_2.Follow a viewpoint of green chemistry, we feel ionic liquid [bmim ] BF_4 is superior to [bmim] PF_6.Extracting [bmim] PF_6 from the product using organic solvent as extractant limits its advantage as a green reaction media.