纤维素可生物降解的包装材料是传统石油基塑料的生态友好替代品。平衡其机械性能和保护值(抗氧化,氧气屏障,等。)是至关重要的。然而,大多数提高其抗氧化性能的研究都伴随着牺牲的机械性能。在目前的工作中,一系列线性-COOH官能化酚类聚合物由酚类化合物(香兰素,3,4-二羟基苯甲醛)通过容易的三组分硫醇-醛缩聚。在规避酚基繁琐的保护-去保护的同时,一锅策略还提供了用于在水性介质中制造具有纤维素纳米纤维的复合材料的水分散性聚合物。在引入5-10重量%的共聚物后,在复合材料内部形成了一个小软相,有助于增强机械强度,韧性,抗氧化能力,和紫外线阻挡性能,同时其氧气阻隔性能得到很好的保持。
Biodegradable packaging materials from cellulose are eco-friendly alternatives to traditional petroleum-based plastics. Balancing its mechanical properties as well as protective values (antioxidation, oxygen barrier, etc.) is critical. However, most studies to improve its antioxidation performance were accompanied by sacrificed mechanical properties. In the current work, a series of linear -COOH functionalized phenolic polymers were prepared from phenolic compounds (vanillin, 3,4-dihydroxy benzaldehyde) through a facile tri-component thiol-aldehyde polycondensation. While circumventing the cumbersome protection-deprotection of phenol groups, the one-pot strategy also affords water dispersible polymers for fabricating composites with cellulose nanofibers in an aqueous medium. After introducing 5-10 wt% of the copolymers, a minor soft phase was formed inside the composites, contributing to enhanced mechanical strength, toughness, antioxidation capability, and ultra-violet blocking performance, while its oxygen barrier property was well maintained.