NanoEngineering Group, Mechanical Engineering Faculty, Technion - Israel Institute of Technology, 32000 Haifa, Israel.
ACS Appl Mater Interfaces. 2022 Jun 8;14(22):26287-26294. doi: 10.1021/acsami.2c06103. Epub 2022 May 26.
Developing new underwater glue adhesives with robust and repeatable adhesion to various surfaces is promising and useful in marine life and medical treatments. In this work, we developed a novel glue based on a copolymer with a cation--aromatic sequence where the cationic units contain both catechol and positively charged sites. The glue consists of a crosslinked copolymer of poly(2-hydroxy-3-phenoxypropyl acrylate--3-(5-(3,4 dihydroxyphenyl)-4-oxo-3 -pentyl)imidazolium) bromide in dimethyl sulfoxide. Solidification of the glue, triggered by contact with water, undergoes a coacervation stage and causes a drastic growth of its mechanical properties over time. The glue demonstrates fast-developing, strong, and repeatable underwater adhesion to different materials and can maintain its strength for a long time. The adhesion strength tends to increase with the surface energy of the substrate material, to a maximum value of 160 kPa found in plywood. Experiments conducted in aqueous media with different pH and ionic strengths, including physiological conditions and seawater, showed an even stronger adhesion than that evolved in deionized water. Thus, the developed glue is a promising candidate for use in marine life, tissue adhesives, and other freshwater and saline water applications.
开发具有稳健且可重复黏附各种表面的水下胶黏剂在海洋生物和医疗处理方面很有前景且实用。在这项工作中，我们开发了一种基于具有阳离子--芳族序列的共聚物的新型胶黏剂，其中阳离子单元既包含儿茶酚又包含带正电荷的位点。这种胶黏剂由聚(2-羟基-3-苯氧基丙基丙烯酸酯-3-(5-(3,4-二羟基苯基)-4-氧代-3-戊基)咪唑啉鎓)溴化物在二甲基亚砜中的交联共聚物组成。胶黏剂与水接触引发固化，经历凝聚阶段，并随着时间的推移导致其机械性能急剧增长。该胶黏剂具有快速发展、强大且可重复的水下黏附力，可黏附于不同材料上，并能长时间保持其强度。黏附强度随着基底材料的表面能增加而增加，在胶合板上达到 160 kPa 的最大值。在不同 pH 值和离子强度的水性介质（包括生理条件和海水）中进行的实验表明，其黏附强度甚至比在去离子水中更强。因此，所开发的胶黏剂是用于海洋生物、组织黏合剂以及其他淡水和盐水应用的有前途的候选材料。
