丁香酚/改性聚乙烯醇抗菌复合膜的制备与性能.

Active packaging can prolong the shelf life of food by releasing functional additive. Polyvinyl alcohol （PVA） has attracted extensive interest for its excellent performance. However, there are some problems such as too strong hydrophilicity and low mechanical properties that limit its application in active packaging. Based on the performance requirements of packaging materials, PVA-CC obtained by cross-linking PVA and cellulose nanofiber (CNF) with citric acid （CA), and eugenol （EUG) as a typical antibacterial agent is loaded in PVA-CC polymer network, and then the composite film PVA-CCE is obtained. It has demonstrated that PVA-CCE shows great mechanical properties, water resistance, thermal stability and antibacterial properties. The swelling ratio of the composite film with CA cross-linking could be reduced from 495. 74% to 72. 00%, exhibiting excellent water resistance. Compared to the PVA film, the melting temperature of PVA-CCE is reduced by 11 ℃, and the decomposition temperature is increased by 20 ℃, which indicates that the processing performance of PVA is obviously improved after covalent cross-linking. Additionally, there are free CA in the polymer network to play a plasticizing role for improving comprehensive properties. Moreover, free CA could play a synergistic role with EUG to improve antibacterial properties of PVA-CCE. These results suggest that the prepared PVA-CCE film has an extensive application prospect in active packaging. [ABSTRACT FROM AUTHOR]