Degradable bio-based polycarbonate material and preparation method thereof

The invention discloses a degradable bio-based polycarbonate material and a preparation method thereof.The preparation method comprises the steps that under the protective atmosphere, pentanediol, isosorbide, terephthalic acid and a first catalyst are mixed and then subjected to an esterification reaction, and a product 1 is obtained; under the protective atmosphere, branched dihydric alcohol, isosorbide, diphenyl carbonate and a second catalyst are mixed and then subjected to transesterification, and a product 2 is obtained; and mixing the product 1, the product 2 and a third catalyst, and carrying out condensation polymerization under a negative pressure condition. According to the degradable bio-based polycarbonate material and the preparation method thereof, branched chains are introduced into the degradable bio-based polycarbonate, the polycarbonate structure is improved, meanwhile, all the raw materials are subjected to esterification and polycondensation, so that the prepared degradable bio-based polyc