摘要
通过无溶剂搅拌策略将液态金属(LM)与β-环糊精(CD)复合制备液态金属/β-环糊精(LM/CD)复合物,并以此为引发剂引发丙烯酰胺(AAm)单体共聚,成功合成具有梯度LM/CD分布的水凝胶。CD的疏水空腔可包封LM液滴,其表面羟基通过配位作用与LM形成物理锚定,结合空间位阻效应抑制颗粒团聚,在搅拌转速2000 r/min、时间30 min条件下可有效分散60%(质量分数)的LM,LM/CD可形成具有自支撑性与导电性的片层结构。通过敲击诱导LM定向析出使LM/CD水凝胶底部电阻发生变化,电化学测试表明,LM/CD水凝胶底面电阻与敲击次数呈线性关系,可以实现仿生记忆功能且在压缩-释放循环中电阻保持稳定。与传统导电聚合物改性水凝胶相比,该材料兼具高导电性(底面电阻0.808Ω)、优异力学性能及稳定的记忆行为,为智能仿生材料设计提供了新思路。
The liquid metal(LM)/β-cyclodextrin(CD)composite was prepared by compounding liquid metal(LM)withβ-cyclodextrin(CD)through a solvent-free stirring strategy.This composite was used as an initiator to trigger the copolymerization of acrylamide(AAm)monomers,successfully synthesizing hydrogels with gradient LM/CD distribution.The hydrophobic cavity of CD can encapsulate LM droplets,and its surface hydroxyl groups form physical anchors with LM through coordination interactions.Combined with the steric hindrance effect to inhibit particle agglomeration,this method can effectively disperse 60%(mass fraction)of LM under stirring conditions of 2000 r/min for 30 min,allowing LM/CD to form a self-supporting and conductive lamellar structure.The bottom resistance of LM/CD hydrogel was changed by tapping to induce directional precipitation of LM.Electrochemical tests showed that the bottom resistance of LM/CD hydrogel was linearly related to the number of tapping,which could realize bionic memory function and keep the resistance stable during compression-release cycle.Compared with traditional conductive polymer-modified hydrogels,this material combines high conductivity(bottom surface resistance 0.808Ω),excellent mechanical properties,and stable memory behavior,providing new ideas for the design of intelligent biomimetic materials.
作者
林星月
徐秀彬
李鑫
韦林洁
王灏
姚希
吴旭
LIN Xingyue;XU Xiubin;LI Xin;WEI Linjie;WANG Hao;YAO Xi;WU Xu(School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510000,Guangdong,China;City University of Hong Kong,Hong Kong 999077,China)
出处
《化工学报》
北大核心
2025年第11期6077-6085,共9页
CIESC Journal
基金
国家自然科学基金项目(22278093,22108049)
广东省杰出青年基金项目(2023A0505050095)
广东省科技厅项目(2023B1515020092,2024A1515011240)
广州市科技项目(2023A03J0031,2024A04J3276)。
关键词
凝胶
仿生记忆
液态金属
环糊精
导电性能
团聚
聚合物
gels
biomimetic memory
liquid metal
cyclodextrin
conductivity
agglomeration
polymers
