Method for preparing vinyl monomer polymer by using cobalt diphosphine dihalide as catalyst
A vinyl monomer and catalyst technology, applied in the field of free radical polymerization, can solve the problems of unsuitability for large-scale industrial production, large amount of catalyst, complex post-treatment, etc., achieve good industrial application conditions and prospects, high catalyst activity, and preparation easy effect
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Embodiment 1
[0031] Add 223.0mg of bis(triphenylphosphine)cobalt dibromide and 25mg of azobisisobutyronitrile into a 100mL Schlenk reaction flask equipped with a stirring magnet, add 10mL of toluene, 6.120g of methyl methacrylate by injection technique . The system went through three cycles of freezing-vacuumizing-freezing, and finally filled with argon. The reaction system was reacted at 80° C. for 2.5 hours, and the monomer conversion rate was 69%. The obtained polymer was analyzed by gel permeation chromatography (GPC), and the molecular weight was 45000, and the molecular weight distribution (MWD) was 1.34.
Embodiment 2
[0033] 22.3 mg of bis(triphenylphosphine) cobalt dibromide and 25 mg of azobisisobutyronitrile were added to a 100 mL Schlenk reaction bottle equipped with a stirring magnet, and 10 mL of toluene and 6.112 g of methyl methacrylate were added by injection technique. The system went through three cycles of freezing-vacuumizing-freezing, and finally filled with argon. The reaction system was reacted at 80° C. for 3 hours, and the monomer conversion rate was 60%. The obtained polymer was analyzed by gel permeation chromatography (GPC), and the molecular weight was 52000, and the molecular weight distribution (MWD) was 1.31.
Embodiment 3
[0035] 22.3 mg of bis(triphenylphosphine) cobalt dibromide and 25 mg of azobisisobutyronitrile were added to a 100 mL Schlenk reaction bottle equipped with a stirring magnet, and 10 mL of toluene and 3.126 g of methyl methacrylate were added by injection technique. The system went through three cycles of freezing-vacuumizing-freezing, and finally filled with argon. The reaction system was reacted at 80° C. for 4 hours, and the monomer conversion rate was 71%. The obtained polymer was analyzed by gel permeation chromatography (GPC), and the molecular weight was 33000, and the molecular weight distribution (MWD) was 1.33.
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