College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian 350007, China.
Fujian-Taiwan Science and Technology Cooperation Base of Biomedical Materials and Tissue Engineering, Fuzhou, Fujian 350007, China.
ACS Appl Mater Interfaces. 2024 Aug 28;16(34):45550-45562. doi: 10.1021/acsami.4c09709. Epub 2024 Aug 15.
Instant and strong adhesion to underwater adherends is a big challenge due to the continuous interference of water. Mussel foot protein-bioinspired catechol-based adhesives have garnered great interest in addressing this issue. Herein, a novel self-made catecholic compound with a long aliphatic chain was utilized to prepare thin (∼0.07 mm) and optically transparent (>80%) wet/underwater adhesive tapes by UV-initiated polymerization. Its adhesion activity was water-triggered, fast (<1 min), and strong (adhesion strength to porcine skin: ∼1.99 MPa; interfacial toughness: ∼610 J/m, burst pressure: ∼1950 mmHg). The effect of the catechol/phenol group and positively charged moiety on the wet/underwater adhesion to abiotic/biotic substrates was investigated. On the wet/underwater adherends, the tape with catechol groups presented much higher interfacial toughness, adhesion strength, and burst pressure than the analogous tape with phenol groups. The tape with both the catechol group and cationic polyelectrolyte chitosan had a more impressive improvement in its adhesion to wet/underwater biological tissues than to abiotic substrates. Therefore, catechol and a positive moiety in the tape would synergistically enhance its wet/underwater adhesion to various substrates, especially to biological tissues. The instant, strong, and noncytotoxic tape may provide applications in underwater adhesion for sealing and wound closure.
由于水的不断干扰，水下附着物的瞬间牢固附着是一个巨大的挑战。贻贝足蛋白仿生儿茶酚基胶粘剂在解决这个问题上引起了极大的兴趣。本文利用一种新型自制的长脂肪链儿茶酚化合物，通过紫外光引发聚合制备了厚度约为 0.07 毫米的薄且光学透明（＞80%）的湿/水下胶粘剂带。其附着活性是水触发的，快速（＜1 分钟），牢固（对猪皮的附着强度：约 1.99 MPa；界面韧性：约 610 J/m，爆裂压力：约 1950 mmHg）。研究了儿茶酚/酚基团和带正电荷部分对非生物/生物基底的湿/水下附着的影响。在湿/水下附着物上，带有儿茶酚基团的胶带在界面韧性、附着强度和爆裂压力方面均优于带有酚基团的类似胶带。带有儿茶酚基团和阳离子聚电解质壳聚糖的胶带在其对湿/水下生物组织的附着方面比非生物基底有更显著的改善。因此，胶带中的儿茶酚和正基团会协同增强其对各种基底的湿/水下附着能力，尤其是对生物组织。这种即时、牢固且无细胞毒性的胶带可能为密封和伤口闭合等水下附着应用提供帮助。
