Materials Engineering Center, UdR INSTM, University of Perugia, Strada Pentima Bassa 4, 05100 Terni, Italy.
Carbohydr Polym. 2014 Jan 30;101:1122-33. doi: 10.1016/j.carbpol.2013.10.055. Epub 2013 Oct 23.
Ternary nano-biocomposite films based on poly(lactic acid) (PLA) with modified cellulose nanocrystals (s-CNC) and synthesized silver nanoparticles (Ag) have been prepared and characterized. The functionalization of the CNC surface with an acid phosphate ester of ethoxylated nonylphenol favoured its dispersion in the PLA matrix. The positive effects of the addition of cellulose and silver on the PLA barrier properties were confirmed by reductions in the water permeability (WVP) and oxygen transmission rate (OTR) of the films tested. The migration level of all nano-biocomposites in contact with food simulants were below the permitted limits in both non-polar and polar simulants. PLA nano-biocomposites showed a significant antibacterial activity influenced by the Ag content, while composting tests showed that the materials were visibly disintegrated after 15 days with the ternary systems showing the highest rate of disintegration under composting conditions.
基于聚乳酸（PLA）的三元纳米生物复合薄膜，用改性纳米纤维素晶体（s-CNC）和合成的银纳米粒子（Ag）制备并进行了表征。用乙氧基化壬基酚的磷酸酸酯对 CNC 表面进行功能化，有利于其在 PLA 基体中的分散。添加纤维素和银对 PLA 阻隔性能的积极影响，通过测试薄膜的水渗透率（WVP）和氧气透过率（OTR）的降低得到了证实。所有与食品模拟物接触的纳米生物复合材料的迁移水平均低于非极性和极性模拟物中的允许限值。PLA 纳米生物复合材料表现出显著的抗菌活性，受 Ag 含量的影响，而堆肥试验表明，在 15 天内，材料在堆肥条件下明显解体，三元体系的解体速度最高。
