METHOD FOR PRODUCING STEREO COMPLEX CRYSTALS OF POLYLACTIC ACID, POLYLACTIC ACID, AND MOLDED BODY, SYNTHETIC FIBER, POROUS BODY AND ION CONDUCTOR COMPRISING SAME

摘要

Provided are a method for producing stereo complex crystals of polylactic acid, with which a polylactic acid having excellent heat resistance and containing stereo complex crystals at a high ratio can be efficiently produced; the thus obtained polylactic acid that contains stereo complex crystals at a high ratio and has excellent heat resistance; and a molded body, a synthetic fiber, a porous body, and an ion conductor each having excellent heat resistance. A method for producing stereo complex crystals of polylactic acid, the method including: a step of dissolving in a solvent a block copolymer, which includes polylactic acid containing an L-lactic acid unit or polylactic acid containing a D-lactic acid unit together with at least one kind of an organic polymer having a different structure from that of polylactic acid, and a polylactic acid homopolymer containing a D-lactic acid unit or a polylactic acid homopolymer containing an L-lactic acid unit, the lactic acid unit being an optical isomer that is not contained in the block copolymer, to prepare a polymer mixture solution; and a step of removing the solvent from the polymer mixture solution.