Instituto de Tecnología de Materiales, Universitat Politècnica de Valencia, 03801 Alcoy-Alicante, Spain.
Materials Engineering Centre, UdR INSTM, NIPLAB, University of Perugia, 05100 Terni, Italy.
Carbohydr Polym. 2015 May 5;121:265-75. doi: 10.1016/j.carbpol.2014.12.056. Epub 2015 Jan 2.
Optically transparent plasticized poly(lactic acid) (PLA) based bionanocomposite films intended for food packaging were prepared by melt blending. Materials were plasticized with 15wt% of acetyl(tributyl citrate) (ATBC) to improve the material processability and to obtain flexibile films. Poly(hydroxybutyrate) (PHB) was used to increase PLA crystallinity. The thermal stability of the PLA-PHB blends was improved by the addition of 5 wt% of cellulose nanocrystals (CNC) or modified cellulose nanocrystals (CNCs) synthesized from microcrystalline cellulose. The combination of ATBC and cellulose nanocrystals, mainly the better dispersed CNCs, improved the interaction between PLA and PHB. Thus, an improvement on the oxygen barrier and stretchability was achieved in PLA-PHB-CNCs-ATBC which also displayed somewhat UV light blocking effect. All bionanocomposite films presented appropriate disintegration in compost suggesting their possible applications as biodegradable packaging materials.
旨在用于食品包装的光透明增塑聚乳酸（PLA）基生物纳米复合材料薄膜通过熔融共混制备。用 15wt%乙酰柠檬酸三丁酯（ATBC）增塑材料以提高材料的加工性能并获得柔韧性薄膜。使用聚羟基丁酸酯（PHB）来提高 PLA 的结晶度。通过添加 5wt%纤维素纳米晶体（CNC）或由微晶纤维素合成的改性纤维素纳米晶体（CNCs），可以提高 PLA-PHB 共混物的热稳定性。ATBC 和纤维素纳米晶体的结合，主要是分散更好的 CNCs，改善了 PLA 和 PHB 之间的相互作用。因此，在 PLA-PHB-CNCs-ATBC 中实现了对氧气阻隔性和拉伸性的改善，同时还显示出一定的紫外线阻挡效果。所有生物纳米复合材料薄膜在堆肥中都表现出适当的分解，表明它们可能作为可生物降解包装材料的应用。
