开发具有多重刺激响应特性的形状记忆水凝胶是智能材料领域的重要目标。然而,现有形状记忆水凝胶存在刺激源种类单一、形状固定率和恢复率低、力学性能差等问题,限制了其实际应用。为解决这一问题,以聚乙烯醇(PVA)为基底,结合壳聚糖季铵盐(HACC)、氧化葡聚糖(ODex)和海藻酸钠(SA),通过循环冻融法物理交联,制备了一种新型智能水凝胶。该水凝胶的形状记忆功能源于Fe3+与SA的羧酸根(—COO-)形成的动态金属配体配位键,以及HACC的氨基与ODex的醛基反应生成的动态亚胺键的可逆形成与解离过程,从而实现了临时形状的高效固定与恢复。结果表明:水凝胶在Fe3+和pH刺激下表现出优异的形状固定率(>90%)与恢复率(>80%)。这种通过化学键协同作用将刺激响应特性与结构可控性有机结合的方式,为高安全性信息加密技术及智能仿生器件的设计提供了全新的策略与思路。
Developing shape-memory hydrogels with multi-stimulus-responsive characteristics was a significant goal in the field of smart materials.However,existing shape-memory hydrogels suffer from limitations such as a restricted stimulus sources,low shape-fixation and recovery rates,and poor mechanical properties,which hinder their practical applications.To address these issues,a novel intelligent hydrogel was successfully prepared with polyvinyl alcohol (PVA) as the base,combined with chitosan quaternary ammonium salt (HACC),oxidized dextran (ODex),and sodium alginate (SA) through a cyclic freezing-thawing method for physical crosslinking.The shape-memory functionality of the hydrogel originated from the dynamic metal-ligand coordination bonds formed between Fe3+ and the carboxylate groups (—COO-) of SA,as well as the reversible formation and dissociation of dynamic imine bonds resulting from the reaction between the amino groups of HACC and the aldehyde groups of ODex.This mechanism allowed for efficient fixation and recovery of temporary shapes.The experimental results showed that the hydrogel exhibited excellent shape fixation rate (>90%) and recovery rate (>80%) under Fe3+ and pH stimuli.This approach combined stimulus-responsiveness with structural controllability through synergistic chemical bonding interactions,providing a novel approach for the design of high-security information encryption technologies and smart biomimetic devices.
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基金资助
国家自然科学基金(12372310);山西省科技合作项目(202304041101033)
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