Istituto per i Polimeri, Compositi e Biomateriali (IPCB), Consiglio Nazionale delle Ricerche (CNR), Via Campi Flegrei 34, 80078 Pozzuoli, NA, Italy.
Istituto per le Macchine Agricole e Movimento Terra (IMAMOTER), Consiglio Nazionale delle Ricerche (CNR), Strada delle Cacce 73, 10135 Torino, Italy.
Int J Biol Macromol. 2016 Jul;88:254-62. doi: 10.1016/j.ijbiomac.2016.03.039. Epub 2016 Mar 21.
Although PLA is much more expensive than polyolefins, such as PP and PE, there is a great interest to propose PLA based material as alternative films for food packaging being PLA derivable from natural source, compostable and biodegradable. For this purpose the research has the task to investigate and propose PLA materials with enhanced properties to be effectively and efficiently alternative to polyolefin films for food packaging application. In this contribution, biocomposite films of PLA with 1, 3 and 5wt% of ZnO have been investigated to determine mechanical, barrier and antimicrobial (against Escherichia coli) properties. It is found that the biocomposite films are characterized by a good dispersion of the ZnO particles in PLA matrix, although no previous treatment was performed on ZnO particles, such as silanization, to decrease its incompatibility with the polymer. The biocomposite films have shown good mechanical properties, decrease of permeability to CO2 and O2, and only a slight increase to water vapour. Particularly important is that, for the biocomposite with 5wt% of ZnO, the % Reduction for E. Coli test reached the value of 99.99 already after 24h.
尽管聚乳酸（PLA）比聚丙烯（PP）和聚乙烯（PE）等聚烯烃贵得多，但人们非常有兴趣用 PLA 基材料替代食品包装用薄膜，因为 PLA 来源于天然资源，可堆肥和生物降解。为此，研究的任务是研究和提出具有增强性能的 PLA 材料，以有效和高效地替代用于食品包装的聚烯烃薄膜。在本研究中，研究了 PLA 与 1wt%、3wt%和 5wt%氧化锌的生物复合材料薄膜，以确定其机械性能、阻隔性能和抗菌性能（针对大肠杆菌）。结果发现，生物复合材料薄膜的 PLA 基体中 ZnO 颗粒分散良好，尽管没有对 ZnO 颗粒进行硅烷化等预处理来降低其与聚合物的不兼容性。生物复合材料薄膜具有良好的机械性能，对 CO2 和 O2 的渗透率降低，水蒸气渗透率仅略有增加。特别重要的是，对于 5wt%氧化锌的生物复合材料，大肠杆菌测试的 %减少值在 24 小时后已经达到 99.99。
