PLA (polylactic acid) barrier film with multiple stereo crystal layers and preparation method of PLA barrier film

The invention belongs to the technical field of barrier film materials, and discloses a PLA (polylactic acid) barrier film with multiple stereo crystal layers and a preparation method of the PLA barrier film. The preparation method comprises the following steps: alternately coating poly-L-lactic acid (PLLA) and poly-D-lactic acid (PDLA), performing layer-by-layer self-assembly by adopting cellulose nanocrystals to obtain a PLA barrier film, and performing heat treatment on the PLA barrier film to induce a plurality of stereocrystal layers so as to improve the barrier property of the PLA barrier film. The PLA barrier film material with the multiple stereo crystal layers prepared by the invention has the characteristics of biological safety, degradability and high barrier property, and can be used as a packaging material in multiple fields. 本发明属于阻隔膜材料技术领域，公开了一种具有多层立构晶层的PLA阻隔膜及其制备方法。将左旋聚乳酸(PLLA)和右旋聚乳酸(PDLA)交替涂敷，同时采用纤维素纳米晶增强，层层自组装得到PLA阻隔膜，并对PLA阻隔膜进行热处理，诱导出多层立构晶层，提升其阻隔性能。本发明制备一种具有多层立构晶层的PLA阻隔膜材料具有生物安全性、可降解、高阻隔性的特点