Method for upgrading and recycling polycaprolactone

The invention relates to a method for upgrading and recycling polycaprolactone, and belongs to the technical field of polymer chemistry. The method provided by the invention comprises the following steps: mixing polycaprolactone, diamine or amino alcohol and a ruthenium catalyst in a solvent, heating for 1-80 hours in a temperature range of 80-240 DEG C to prepare the polyesteramide and polyamide high polymer material by a one-pot upgrading method, and adjusting the properties of the obtained polymer by changing the variety and feed ratio of the diamine or amino alcohol. And the number-average molecular weight is 1000-500 thousands. According to the method, the waste polycaprolactone and the commercial catalyst are used as raw materials, the reaction condition is mild, the byproduct only contains hydrogen, the requirement on production equipment is low, the high-performance polymer can be prepared while the plastic pollution is solved, and the principle of green, efficient and safe production is met. 本发明涉及一种聚