左旋聚乳酸/右旋聚乳酸交替多层薄膜的结晶调控和高性能化  

Crystallization Regulation and High Performance of Alternating Multilayer Films of L-Poly(lactic acid)/D-Poly(lactic acid)

作　　者：高营营 李姜[1] 郭少云[1] Yingying Gao;Jiang Li;Shaoyun Guo(State Key Laboratory of Polymer Materials Engineering,Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology,Polymer Research Institute of Sichuan University,Chengdu 610065,China)

机构地区：[1]高分子材料工程国家重点实验室(四川大学)四川省橡塑材料复合成型技术工程实验室四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2020年第8期104-108,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51873112);四川省科技厅应用基础(重大前沿)(2018JY0548)。

摘　　要：通过溶液刮涂法,将浓度均为0.04 g/mL的左旋聚乳酸(PLLA)和右旋聚乳酸(PDLA)溶液用刮涂机层层交替涂覆烘干后制备成薄膜,并将PDLA/PLLA(1∶1)共混溶液及纯PLLA溶液用涂布机采用相同的方法制备出薄膜作为对比样。通过差示扫描量热分析、二维广角X射线衍射、扫描电子显微镜、万能拉伸机、压差法气体渗透仪研究了PDLA/PLLA交替多层结构对PLA结晶行为、微观形貌、力学性能及氧气阻隔性能的影响。结果表明,PLLA层与PDLA层之间可以形成二维连续立构晶层,二维连续立构晶层(2D-SC)还可以作为成核剂,诱导两侧连续有序PLLA横晶(PLLA-TC)与PDLA横晶(PDLA-TC)的生成。2D-SC晶体、PLLA-TC晶体及PDLA-TC晶体的存在可以大幅度提升聚乳酸的气体阻隔性能。By solution coating method,l-polylactic acid(PLLA)and d-polylactic acid(PDLA)solutions with the concentration of 0.04 g/mL were alternately coated by scraping machine layer by layer and dried to prepare the films,and PDLA/PLLA(1∶1)blend solution and pure PLLA solution were prepared by coating machine at the same way to prepare the films as comparison sample.By differential scanning calorimetry(DSC),two-dimensional WAXD,SEM,universal drawing machine and differential pressure gas permeometer,the effects of PDLA/PLLA alternating multilayer structure on the crystallization behavior,microstructure,mechanical properties and oxygen barrier properties of PLA were studied.The results show that the two-dimensional continuous stereocomplex crystallites(2 D-SC)could be formed between PLLA layer and PDLA layer,and the two-dimensional continuous stereocomplex crystallites(2 D-SC)could also be used as nucleating agent to induce the generation of continuous ordered PLLA transcrystalline(PLLA-TC)and PDLA transcrystalline(PDLA-TC)on both sides.The presence of 2 D-SC,PLLA-TC and PDLA-TC can greatly improve the gas barrier properties of PLA.

关 键 词：聚乳酸 二维连续 立构晶 横晶 

分 类 号：TB332[一般工业技术—材料科学与工程]