Underwater contact adhesion and microarchitecture in polyelectrolyte complexes actuated by solvent exchange.
Underwater contact adhesion and microarchitecture in polyelectrolyte complexes actuated by solvent exchange.
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DOI：
10.1038/nmat4539
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发表时间：
2016-04
期刊：
影响因子：
41.2
通讯作者：
Waite JH
中科院分区：
文献类型：
--
作者：
Zhao Q;Lee DW;Ahn BK;Seo S;Kaufman Y;Israelachvili JN;Waite JH
聚电解质络合对于许多生物和聚合物材料的形成和性能至关重要，通常由水相混合引发，然后进行液-液相分离，例如凝聚。然而，人们对凝聚层如何演化成复杂的固体微结构知之甚少。受沙堡蠕虫水泥蛋白化学特征的启发，我们在这里报道了一种多功能且强效的湿接触微孔粘合剂，其由溶剂交换引发的聚电解质络合产生。将儿茶酚官能化的弱聚阴离子与聚阳离子在二甲亚砜 (DMSO) 中预混合后，将该溶液在水下涂覆到各种基材上，通过水-DMSO 溶剂交换同时启动静电络合、相转化和快速凝固。络合、反转和设置的空间和时间协调促进了络合儿茶酚聚电解质对所有测试表面（包括塑料、玻璃、金属和生物材料）的快速（~25 s）和强大的水下接触粘附（Wad ≥ 2 J m−2）。
Polyelectrolyte complexation is critical to the formation and properties of many biological and polymeric materials, and is typically initiated by aqueous mixing followed by fluid–fluid phase separation, such as coacervation. Yet little to nothing is known about how coacervates evolve into intricate solid microarchitectures. Inspired by the chemical features of the cement proteins of the sandcastle worm, here we report a versatile and strong wet-contact microporous adhesive resulting from polyelectrolyte complexation triggered by solvent exchange. After premixing a catechol-functionalized weak polyanion with a polycation in dimethyl sulphoxide (DMSO), the solution was applied underwater to various substrates whereupon electrostatic complexation, phase inversion, and rapid setting were simultaneously actuated by water–DMSO solvent exchange. Spatial and temporal coordination of complexation, inversion and setting fostered rapid (~25 s) and robust underwater contact adhesion (Wad ≥ 2 J m−2) of complexed catecholic polyelectrolytes to all tested surfaces including plastics, glasses, metals and biological materials.