Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
Adv Sci (Weinh). 2022 Oct;9(28):e2203182. doi: 10.1002/advs.202203182. Epub 2022 Aug 9.
Developing high-performance and reusable adhesives from renewable feedstocks is of significance to sustainable development, yet it still remains a formidable task. Herein, castor oil, melevodopa, and iron ions are used as building blocks to construct a novel bio-based supramolecular adhesive (BSA) with outstanding adhesion performances. It is prepared through partial coordination between melevodopa functionalized castor oil and Fe ions. Noncovalent interactions between adherends and the catechol unit from melevodopa contribute to reinforcing adhesion, and the metal-ligand coordination between catechol and Fe ions is utilized to strengthen cohesion. By combining strong adhesion and tough cohesion, the prepared BSA achieves an adhesion strength of 14.6 MPa at ambient temperature, a record-high value among reported bio-based adhesives as well as supramolecular adhesives to the best of knowledge. It also outperforms those adhesives at cryogenic temperature, realizing another record-high adhesion strength of 9.5 MPa at -196 °C. In addition, the BSA displays excellent multi-reusability with more than 87% of the original adhesion strength remaining even after reuse for ten times. It is highly anticipated that this line of research will provide a new insight into designing bio-based adhesives with outstanding adhesion performances and excellent multi-reusability.
从可再生原料开发高性能且可重复使用的粘合剂对于可持续发展具有重要意义，但这仍然是一项艰巨的任务。在此，我们以蓖麻油、左旋多巴和铁离子为构建模块，构建了一种具有优异粘附性能的新型生物基超分子粘合剂（BSA）。它是通过左旋多巴功能化蓖麻油与 Fe 离子的部分配位制备的。粘附体之间的非共价相互作用以及左旋多巴中的儿茶酚单元有助于增强粘附力，儿茶酚和 Fe 离子之间的金属配体配位用于增强内聚性。通过结合强粘附性和坚韧的内聚性，所制备的 BSA 在环境温度下实现了 14.6 MPa 的粘附强度，这是在报道的生物基粘合剂以及超分子粘合剂中创纪录的高值，据我们所知。它在低温下的表现也优于那些粘合剂，在-196°C 下实现了 9.5 MPa 的另一个创纪录的高粘附强度。此外，BSA 具有出色的多次重复使用性，即使重复使用十次，其原始粘附强度仍保持在 87%以上。我们高度期待这项研究为设计具有出色粘附性能和优异多次重复使用性的生物基粘合剂提供新的思路。
