College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
College of Material Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
Carbohydr Polym. 2018 Mar 1;183:102-109. doi: 10.1016/j.carbpol.2017.11.079. Epub 2017 Dec 2.
Cellulose nanofiber (CNF) was modified by rosin and used as a reinforcement filler within a polylactic acid (PLA) matrix. The resulting film was then coated with chitosan (CHT) to prepare a two-layer composite film for antimicrobial food packaging. The FT-IR spectra of rosin modified CNF (R-CNF) displayed a clear peak at 1730cm, which confirmed the successful esterification of CNF by rosin. The R-CNF showed a better dispersion in PLA matrix than CNF and the loading of R-CNF had a significant effect on the mechanical properties of the resulting film. A percolation network was formed when the R-CNF loading was 8%, where the composite film displayed optimum mechanical properties. The antimicrobial test showed that the R-CNF/PLA/CHT composite film exhibited excellent antimicrobial performance against E. coli and B. subtilis, which could be attributed to the synergistic antimicrobial effect of CHT and rosin.
纤维素纳米纤维（CNF）经过松香改性后，作为增强填料加入到聚乳酸（PLA）基体中。然后，将得到的薄膜用壳聚糖（CHT）进行涂层处理，制备具有抗菌性能的双层复合薄膜，用于食品包装。松香改性 CNF（R-CNF）的傅里叶变换红外光谱（FT-IR）在 1730cm 处显示出一个清晰的峰，这证实了 CNF 被松香成功酯化。R-CNF 在 PLA 基体中的分散性优于 CNF，R-CNF 的负载量对所得薄膜的力学性能有显著影响。当 R-CNF 的负载量为 8%时，形成了渗流网络，复合薄膜表现出最佳的力学性能。抗菌试验表明，R-CNF/PLA/CHT 复合薄膜对大肠杆菌和枯草芽孢杆菌表现出优异的抗菌性能，这归因于 CHT 和松香的协同抗菌作用。
