Abstract:

The loaded aluminum chloride on MCM-41 molecular sieve was used to catalyze the copolymerization of methyl acrylate and 1-octene. Through detecting the polymer yield by weighing method， the copolymer composition by hydrogen nuclear magnetic resonance spectroscopy， and the relative number average molecular weight by gel permeation chromatography， the relationship of the polymer yield and copolymer composition with the polymerization reaction time， the influence of the catalyst composition and the amount of the catalyst on the copolymerization， as well as the catalyst recycling performance were studied. The results show that the polymer yield increases with time in an S-shape， while the composition of the copolymer almost remains constant with time， which is consistent with the law of the aluminum chloride catalyst system； the solvent（dichloromethane， ethanol or xylene） mainly affects the composition of the polymer， and has little effect on the relative number average molecular weight and distribution of the polymer； the increase of active components in the catalyst is beneficial to increase the 1-octene unit in the copolymer， but has little effect on the molecular weight and molecular weight distribution of the polymer； when the active component content in the catalyst is constant， the increase of the molar ratio of catalyst to monomer from 0.125 to 0.5 is beneficial for increasing the content of 1-octene units in the copolymer. After the catalyst is used for three times， it still has good cataly-tic activity， and the olefin unit can be introduced into the copolymer to obtain a poly（methyl acrylate-co-1-octene） copolymer with a 1-octene unit content of 30.1%.

Key words: MCM-41 Molecular sieve supported aluminum chloride, Heterogeneous catalysis, Polar monomer, Non-polar olefin, Copolymerization