Manufacturing method of poly lactic acid stereocomplex using solvent casting method

摘要

Disclosed is a method for manufacturing a polylactic acid film. More specifically, the present invention relates to a method for stably and effectively obtaining optimized stereocomplex crystals through specified boiling point and evaporation time of a solvent allowing the content of stereocomplex crystals to be 100%.

主权项

1. A method for manufacturing a polylactic acid stereocomplex film, comprising the steps of:
(1) selecting a solvent whose boiling point ranges from 39.6° C. to 130.5° C.; (2) calculating minimum evaporation time required to achieve 100% of stereocomplex crystals by evaporating the selected solvent using Equation 1
y=0.0042x2−0.2769x+10±5  Equation 1 wherein x is the boiling point of the selected solvent, and y is the minimum evaporation time required to achieve 100% of stereocomplex crystals by evaporating the selected solvent in hours; (3) mixing only poly-L-lactic acid and poly-D-lactic acid in a solvent; and (4) evaporating the selected solvent for the minimum evaporation time calculated in step (2) at 20˜30° C., wherein the polylactic acid stereocomplex film consists of 100% of stereocomplex crystals of the poly-L-lactic acid and the poly-D-lactic acid, and the minimum evaporation time calculated in step (2) ranges from 0.6 hour to 50.4 hours.