应用化学 ›› 2023, Vol. 40 ›› Issue (4): 527-535.DOI: 10.19894/j.issn.1000-0518.220318

• 研究论文 • 上一篇    下一篇

丁香酚/改性聚乙烯醇抗菌复合膜的制备与性能

颜丽娟, 高添贺, 施冬健, 陈明清()   

  1. 江南大学化学与材料工程学院,合成与生物胶体教育部重点实验室,无锡 214122
  • 收稿日期:2022-09-27 接受日期:2023-02-17 出版日期:2023-04-01 发布日期:2023-04-17
  • 通讯作者: 陈明清
  • 基金资助:
    国家自然科学基金(52103165)

Preparation and Properties of Eugenol/Modified Polyvinyl Alcohol Antibacterial Composite Films

Li-Juan YAN, Tian-He GAO, Dong-Jian SHI, Ming-Qing CHEN()   

  1. the Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2022-09-27 Accepted:2023-02-17 Published:2023-04-01 Online:2023-04-17
  • Contact: Ming-Qing CHEN
  • About author:mqchen@jiangnan.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52103165)

摘要:

活性包装可通过释放功能性物质而提高食品的防腐保鲜性能,以延长食品的货架期。聚乙烯醇(PVA)由于其优异的综合性能在包装领域备受关注,但其强亲水性使其存在耐水性差、机械性能弱等问题。据此,本研究选用纤维素纳米纤维(CNF)复合PVA,进而通过柠檬酸(CA)交联,制备PVA-CC成膜基材;再将天然植物精油丁香酚(EUG)作为抗菌模板分子载入到PVA-CC聚合物网络中,制备了具有抗菌活性的复合膜PVA-CCE。通过对复合膜的结构和性能进行一系列的表征与测试发现,该复合膜具有良好的机械性能、耐水性、热稳定性和抗菌性。经过CA交联后的复合膜PVA-CCE在水中的溶胀率可从原来的495.74%降低至72.00%,耐水性得到了显著提升;并且与纯的PVA膜相比,该复合膜的熔融温度降低了11 ℃,分解温度提高了20 ℃,这说明经过CA共价交联后PVA的加工性能得到改善。同时,复合膜中存在游离的CA能够降低分子间的作用力而起到增塑作用,并可以与EUG协同抗菌增强复合膜的抗菌效果。这些实验结果表明,复合膜PVA-CCE在活性包装领域具有十分广泛的应用前景。

关键词: 聚乙烯醇, 化学交联, 丁香酚, 耐水性, 抗菌性

Abstract:

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.

Key words: Polyvinyl alcohol, Chemical cross-linking, Eugenol, Water resistance, Antibacterial

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