Abstract：
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/m2, 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.
摘要：
由于水的持续干扰，对水下被粘物的即时和强粘附是一个很大的挑战。贻贝足蛋白生物启发的儿茶酚基粘合剂在解决这个问题上已经引起了极大的兴趣。在这里，一种新型的具有长脂肪链的自制儿茶酚化合物被用于通过UV引发的聚合制备薄(~0.07mm)和光学透明(>80%)的湿/水下胶带。它的粘附活性是水触发的，快速（<1分钟），和强（对猪皮肤的粘附强度：〜1.99MPa；界面韧性：〜610J/m2，爆破压力：〜1950mmHg）。研究了儿茶酚/苯酚基团和带正电的部分对对非生物/生物底物的湿/水下粘附的影响。在湿/水下粘附体上，具有邻苯二酚基团的胶带具有更高的界面韧性，粘合强度,和破裂压力比类似带苯酚基团的胶带。具有儿茶酚基团和阳离子聚电解质壳聚糖的胶带对湿/水下生物组织的粘附性比对非生物基材的粘附性有更令人印象深刻的改善。因此,邻苯二酚和胶带中的阳性部分将协同增强其对各种基材的湿/水下粘附力，尤其是生物组织。瞬间，坚强,和非细胞毒性胶带可以在水下粘附中提供密封和伤口闭合的应用。
