Guo Xiang, Wang Hong, Xiong Xinghong, Zhao Shifang, Li Mei, Chang Qi, Cui Jiaxi
School of Medicine Shaoxing University Shaoxing 312000 China.
Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu Sichuan 611731 China.
Small Sci. 2023 Jul 26;3(9):2300083. doi: 10.1002/smsc.202300083. eCollection 2023 Sep.
Complexes associated with strong electrostatic interactions constitute a valuable method to construct tough hydrogels, but current systems are either unstable in saline environments or lead to relatively soft matrices. Herein, a class of acid-base complex (ABC) hydrogels made from poly(2-(dimethylamino)ethyl methacrylate) and glassy poly(methacrylic acid) (PMA) is reported. The tough hydrogels are prepared via a dialysis-free process and maintain their structure in saline solutions. Results indicate that the glassy feature of PMA endows the ABC hydrogels with high moduli (227 MPa), typical yielding points (3 MPa), and moderate stretchability (300% strain). The glassy backbones (PMA chains) are stiff at low temperatures, and would be melted at high temperatures, which bring about interesting shape-memory effects and inverse memory-forgetting behaviors. These results may inspire a simple but powerful strategy to design innovative hydrogel materials.
与强静电相互作用相关的复合物是构建坚韧水凝胶的一种有价值的方法，但目前的体系在盐溶液环境中要么不稳定，要么会导致形成相对柔软的基质。在此，报道了一类由聚（甲基丙烯酸2-（二甲基氨基）乙酯）和玻璃态聚（甲基丙烯酸）（PMA）制成的酸碱复合物（ABC）水凝胶。这些坚韧的水凝胶通过无透析过程制备，并在盐溶液中保持其结构。结果表明，PMA的玻璃态特性赋予ABC水凝胶高模量（227兆帕）、典型的屈服点（3兆帕）和适度的拉伸性（300%应变）。玻璃态主链（PMA链）在低温下坚硬，在高温下会熔化，这带来了有趣的形状记忆效应和反向记忆遗忘行为。这些结果可能会激发一种简单而有效的策略来设计创新的水凝胶材料。
