Poly(lactic acid) membrane and method of making the membrane

Abstract

A polylactic acid nano-fiber membrane and preparation method thereof. In particular, the membrane has PLA nanofibers with an average diameter between 50 nm and 200 nm, wherein the nanofibers contain a crystal phase with a volume fraction between 45% and 85% and the crystal phase contains PLA stereocomplex crystals with a volume fraction between 85% and 95%. The method of preparation includes mixing dried PDLA and PLLA in a specific PLLA/PDLA ratio of between 95/5 and 99/1; producing continuous fibers or nonwovens in a extrusion and spinning device, and producing woven fabrics or nonwovens with the continuous fibers; heat treating the woven fabrics or nonwovens; washing the heat treated woven fabrics or nonwovens with a solvent; removing the solvent and drying the woven fabrics or nonwovens; and pressing the dried woven fabrics or nonwovens for making the membrane.

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