Abstract: [Object] An object of the present invention is to provide a novel artificial slime-like polymer material capable of controlling flow characteristics without changing a chemical composition such as a main chain skeleton or a solvent constituting the polymer material. [Solution] It is found that a slime-like polymer material in which liquid-liquid phase separation is induced can be provided and fluidity of the polymer material can be controlled by adding a polymer that does not react with a polymer unit serving as a basic skeleton constituting the polymer material in addition to the polymer unit.

Abstract: An object is to provide a novel artificial slime-like polymer material having stability against an external solvent without changing the chemical composition of a main chain skeleton, a solvent, and the like constituting the polymer material and without impairing the viscosity and elasticity of the slime-like material. It has been found that by controlling the number of branches, terminal connectivity, and concentration of polymer units constituting the polymer material, it is possible to provide a slime-like polymer material that induces liquid-liquid phase separation and thereby control solubility in external solvents.