由壳聚糖和单宁酸制成的全生物基粘合剂，具有高耐水性,ACS Sustainable Chemistry & Engineering

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由壳聚糖和单宁酸制成的全生物基粘合剂，具有高耐水性
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-03-01 , DOI: 10.1021/acssuschemeng.3c07306
Runtian Qie ₁ , Saeed Zajforoushan Moghaddam ₁ , Esben Thormann ₁

Affiliation

在这项研究中，我们从天然贻贝粘合机制中汲取灵感，使用壳聚糖和单宁酸开发了一种完全生物基粘合剂。我们的目标是解决与制造环保型粘合剂相关的技术挑战，这些粘合剂的性能可与合成粘合剂相媲美，特别是在耐水性方面。该方法涉及壳聚糖（一种富含胺基的多糖）与单宁酸（以其没食子酰基部分而闻名）的分子络合。这种络合模拟了贻贝粘合剂中发现的多巴-赖氨酸协同作用，从而在适当的 pH 条件下形成具有粘性和粘合性的材料。值得注意的是，在温和热固化（70°C 2 小时）后，我们的生物基粘合剂表现出出色的耐水性和长期耐久性。即使在水中浸泡 2 个月后，其搭接剪切强度仍保持约 3.5 MPa，并且在断裂前可拉伸和释放 1000 次以上。这些性能指标超过了商用防水粘合剂 Gorilla Glue 和著名的强力干粘合剂 Loctite Super Glue（均在推荐条件下固化）。这种粘合剂的成功强调了利用分子络合和仿生化学等自然机制来开发克服耐水性差挑战的下一代生物基粘合剂的重要性。这种生物基粘合剂具有作为石油基粘合剂的可持续替代品的潜在应用，而生物基原材料的价格和可用性需要持续评估。

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Fully Biobased Adhesive from Chitosan and Tannic Acid with High Water Resistance

In this study, we developed a fully biobased adhesive using chitosan and tannic acid, drawing inspiration from natural mussel adhesive mechanisms. Our goal was to address the technological challenges associated with creating environmentally friendly adhesives that can perform comparably to their synthetic counterparts, particularly in terms of water resistance. The methodology involved the molecular complexation of chitosan, a polysaccharide rich in amine groups, with tannic acid, which is known for its galloyl moieties. This complexation mimics the dopa-lysine synergy found in mussel adhesives, leading to a cohesive and adhesive material under the right pH conditions. Notably, after mild thermal curing (70 °C for 2 h), our biobased adhesive demonstrated outstanding water resistance and long-term durability. It maintained a lap shear strength of approximately 3.5 MPa even after immersion in water for 2 months and could be stretched and released more than 1000 times before breaking. These performance metrics surpassed those of a commercial water-resistant adhesive, Gorilla Glue, and a well-known strong dry adhesive, Loctite Super Glue (both cured under their recommended conditions). The success of this adhesive underscores the importance of leveraging nature’s mechanisms, such as molecular complexation and bioinspired chemistry, in developing next-generation biobased adhesives that overcome the challenge of poor water resistance. This biobased adhesive has potential applications as a sustainable alternative to petroleum-based adhesives, while the price and availability of the biobased raw materials need continuous evaluation.

更新日期：2024-03-01

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