Dipartimento di Scienze Molecolari e Nanosistemi (DSMN), Università Ca'Foscari Venezia, Via Torino 155, 30172 Venezia Mestre, Italy.
Dipartimento Fisica, Università degli Studi di Perugia, Via Pascoli, 06123 Perugia, Italy.
Int J Biol Macromol. 2022 Jun 1;209(Pt B):2009-2019. doi: 10.1016/j.ijbiomac.2022.04.181. Epub 2022 May 2.
In this paper we present a novel strategy to easily prepare biodegradable chitosan derived films as new packaging systems. Combination of chitosan, adipic acid and 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methyl-morpholinium chloride (DMTMM) allowed to obtain high-performing cross-linked films. Biobased glycerol was employed as plasticizer. An in-depth study was performed on ten different samples in order to evaluate the role of DMTMM as cross-linking agent. Experimental data showed that 15 wt% of DMTMM enhanced moisture content and moisture uptake (10.42% and 11.11%), water vapor permeability (0.13 10 g m h Pa) and good UV barrier properties. Additionally, 30 wt% of DMTMM significantly increased the tensile strength of films up to 83 MPa and elongation at break values reached 39.7%. Thermogravimetric, IR, XRD and SEM analysis confirmed that physical-mechanical properties of the obtained films were considerably improved, due to cross-linking by DMTMM, demonstrating promising properties for packaging applications.
本文提出了一种简单制备可生物降解壳聚糖衍生薄膜的新策略，将其作为新型包装系统。壳聚糖、己二酸和 4-(4,6-二甲氧基-1,3,5-三嗪-2-基)-4-甲基吗啉鎓氯化物（DMTMM）的组合允许获得高性能交联膜。生物基甘油被用作增塑剂。对十种不同的样品进行了深入研究，以评估 DMTMM 作为交联剂的作用。实验数据表明，15wt%的 DMTMM 提高了水分含量和水分吸收率（10.42%和 11.11%）、水蒸气透过率（0.1310g m h Pa）和良好的 UV 阻隔性能。此外，30wt%的 DMTMM 显著提高了薄膜的拉伸强度，达到 83MPa，断裂伸长率达到 39.7%。热重分析、IR、XRD 和 SEM 分析证实，由于 DMTMM 的交联，所得薄膜的物理力学性能得到了显著改善，这证明了其在包装应用方面具有良好的应用前景。
