Method for promoting phase separation of polymer solution and method for phase separation of polymer solution

The invention relates to the field of polymer preparation, and discloses a method for promoting phase separation of a polymer solution. The polymer solution phase separation method comprises the steps that heat treatment is carried out in the state that an auxiliary phase separation agent makes contact with a polymer solution, so that the polymer solution is divided into a clear liquid phase and a concentrated liquid phase, and the auxiliary phase separation agent is a gas-phase or liquid-phase substance which is dissolved in the polymer solution and has the boiling point lower than 65 DEG C. According to the method, the polymer solution phase separation can be promoted. 本发明涉及聚合物制备领域，公开了一种促进聚合物溶液相分离的方法。本发明的聚合物溶液相分离的方法包括：在助分相剂与聚合物溶液接触的状态下进行热处理使得所述聚合物溶液分成清液相和浓液相，其中，所述助分相剂为与所述聚合物溶液相溶且沸点低于65℃的气相或液相物质。通过本发明的方法，能够促进聚合物溶液相分离。