Method for preparing aliphatic polycarbonate by copolymerization reaction of carbon dioxide and cyclohexene oxide

The invention discloses a method for preparing aliphatic polycarbonate by copolymerization reaction of carbon dioxide and cyclohexene oxide. According to the method, a 2,5-di(2-aldehyde phenoxy methyl)thiophene acetal 3-aminothienylzinc complex is adopted as a catalyst, the mass of the catalyst is 0.05 to 1 percent of the mass of the cyclohexene oxide; when the aliphatic polycarbonate is preparedby copolymerization reaction of the carbon dioxide and the cyclohexene oxide, the reaction temperature is 80 to 220 DEG C, the pressure of the carbon dioxide is 1 to 5MPa, the reaction time is 6 to 48h, and the whole copolymerization reaction during preparation of the aliphatic polycarbonate by copolymerization reaction of the carbon dioxide and the cyclohexene oxide is performed under a solvent-free condition. According to the method, the catalyst has the advantages of high catalytic efficiency, high reaction selectivity, mild catalytic reaction condition and convenience for operation when being used for copolymeriza