POLY(LACTIC ACID) MEMBRANE AND METHOD OF MAKING THE MEMBRANE

摘要

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.

主权项

1. A membrane of poly (lactic acid) (PLA), the membrane having an average thickness between 5 μm and 55 μm, an average porosity between 75% and 85%, an average pore size between 0.1 μm and 1 μm, and comprising PLA nanofibers with an average diameter between 50 nm and 200 nm, wherein said 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%.