Method for preparing polyalkylene carbonate resin

A method for preparing a polyalkylene carbonate resin, the method comprising:

• polymerizing an alkylene oxide compound and carbon dioxide in the presence of a catalyst,
• wherein the polyalkylene carbonate resin has a glass transition temperature (Tg) of −10° C. to 50° C. and comprises a repeating unit represented by Formula 1 and a repeating unit represented by Formula 2,
• wherein the catalyst comprises a double metal cyanide compound and a complexing agent, and
• wherein the complexing agent is a compound represented by the following Formula 9:
• wherein in Formula 1 and Formula 2;
• R1 to R8 are each independently hydrogen, a linear alkyl group of 1 to 20 carbon atoms, a branched alkyl group of 3 to 20 carbon atoms, an aryl group of 6 to 20 carbon atoms, an alkenyl group of 2 to 20 carbon atoms, or a cycloalkyl group of 3 to 20 carbon atoms,
• * is a connecting part between repeating units, and
• x and y are mole fractions, where x is 0.70 to 1.00, y is 0.00 to 0.30, and x+y is 1,
• wherein R9a and R9b are each independently a single bond or an alkylene group of 1 to 5 carbon atoms, where at least one among R9a and R9b is an alkylene group of 1 to 5 carbon atoms,
• R9c and R9a are each independently a hydrogen atom or an alkyl group of 1 to 6 carbon atoms, and
• n is an integer of 0 to 2.