High molecular-weight aliphatic polycarbonate copolymer and preparation method thereof

The present invention is an aliphatic polycarbonate copolymer including a repeating unit represented by chemical formula 1. In chemical formula 1,A is a substituted or unsubstitued C3-60 alkylene or a substituted or unsubstituted C3-60 heteroalkylene; each of O-A-O units in one polymer chain can be the same or different from each other; B is a substituted or unsubstituted C5-20 arylene or a substituted or unsubstituted C5-20 heteroarylene; each of -C(O)-B-C(O)- units can be the same or different from each other; and x and y are real numbers representing mole fractions. [Reference numerals] (AA) Remaining methoxy, alcohol signal