<br>坚固的可生物降解纤维素材料，通过氢键定制策略提高结晶度，用于紫外线阻挡和抗氧化活性,International Journal of Biological Macromolecules

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坚固的可生物降解纤维素材料，通过氢键定制策略提高结晶度，用于紫外线阻挡和抗氧化活性
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2020-07-14 , DOI: 10.1016/j.ijbiomac.2020.07.100
Zechang Wei ₁ , Chenyang Cai ₁ , Yangze Huang ₁ , Pei Wang ₁ , Jianyue Song ₁ , Leixin Deng ₁ , Yu Fu ₁

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从基于纤维素纳米晶体（CNC）的食品包装材料中获得优异的机械强度和理想的多功能性一直是一个巨大的挑战。在这项工作中，我们展示了一种氢键定制策略，该策略可以生产具有紫外线阻隔和抗氧化活性的 CNC/木质素薄膜，同时绕过机械强度的损失。使用超支化聚酯，木质素首先被功能化以增加羟基的数量，从而增加分子间相互作用。通过将聚酯改性木质素（H-lignin）组装到 CNC 基体中，成功促进了 H-木质素和 CNC 链之间的氢键交联，使 CNC 复合材料的机械强度、紫外线阻隔和抗氧化活性得到显著提高。酚类结构和 H-木质素的氢供体也赋予了所得的 CNC 复合材料优异的紫外线阻隔和抗氧化活性。实验结果表明，H-木质素的拉伸强度和杨氏模量分别比已报道的提高了约 34% 和 63%。CNC 基复合材料表现出更好的热稳定性和更好的结晶度性能。H-木质素为基于 CNC 的复合材料的多功能探索提供了新的见解。这项工作为来自纤维素来源复合材料的下一代可生物降解食品包装材料开辟了一条新途径。

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Strong biodegradable cellulose materials with improved crystallinity via hydrogen bonding tailoring strategy for UV blocking and antioxidant activity

It has been a huge challenge to obtain simultaneously excellent mechanical strength and desirable multifunctionality from the cellulose nanocrystals (CNC) based food packing materials. In this work, we demonstrated a hydrogen bonding tailoring strategy that can produce CNC/lignin films with UV blocking and antioxidant activity, while bypassing the loss of mechanical strength. Using a hyperbranched polyester, lignin was first functionalized to increase the amount of hydroxyl groups, thereby increasing the intermolecular interactions. By assembling the polyester modified lignin (H-lignin) into CNC matrix, the hydrogen bonding crosslinks between the H-lignin and CNC chains were successfully promoted, resulting in the CNC composites with the significantly improved mechanical strength, UV blocking and antioxidant activity. The phenolic structure and the hydrogen donation of H-lignin also endowed the resulting CNC composites with excellent UV blocking and antioxidant activity. The experimental results indicated that the H-lignin could bring about 34% and 63% increase in tensile strength and Young's modulus, respectively, higher than the reported ones. The CNC-based composites showed better thermal stability and improved crystallinity property. The H-lignin provides a new insight into the multifunctional exploration of CNC-based composite. This work opens a new avenue for the next generation's biodegradable food packing materials from cellulose-sourced composites.

更新日期：2020-07-14

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