本研究展示了一種簡便的方法，通過直接將聚丙烯酸（PAA）分散在第四型深共熔溶劑（DES）中，製備可拉伸和導電的共熔凝膠。這些DES包含氯化金屬水合物，如MgCl2或ZnCl2作為氫鍵受體，以及甘油或乙二醇作為氫鍵供體。共熔凝膠表現出類似液體的行為，具有剪切稀化並具有屈服應力，而其凝膠狀行為則通過儲存模量大於損失模量來識別。此外，應力-應變曲線顯示了固狀的行為。DES的流變和機械性質在很大程度上取決於DES的組分和組成，以及PAA的濃度。第四型DES中的聚合物網絡形成歸因於陽離子橋機制，其中二價金屬離子作為交聯劑在PAA聚合物之間起作用。通過對共熔凝膠的離子導電度和紅外光譜分析，研究了交聯機制。由於陽離子橋和氫鍵的協同作用，共熔凝膠可以展現卓越的拉伸性（~1500％）和顯著的導電性（7.69 mS/cm）。;This study demonstrates the facile fabrication of stretchable and conductive eutectogels by directly dispersing poly(acrylic acid) (PAA) in type IV deep eutectic solvents (DESs). These DESs contain metal chloride hydrates like MgCl2 or ZnCl2 as hydrogen bond acceptor and glycerol or ethylene glycol as hydrogen bond donor. The eutectogel demonstrated liquid-like behavior, characterized by shear-thinning with a yield stress, while its gel-like behavior was identified by a storage modulus greater than the loss modulus. Additionally, the solid-like behavior was evidenced by the stress-strain curves. The rheological and mechanical properties of DESs were found to depend significantly on the component and composition of DESs, as well as the concentration of PAA. The polymer network formation in type IV DESs is attributed to the cation-bridge mechanism, where divalent metal ions act as cross-linking agents among PAA polymers. The cross-linking mechanism has been examined by the ionic conductivity and IR spectroscopy analyses of the eutectogel. Due to the synergistic cation-bridging and hydrogen bonding, the eutectogel can display exceptional stretchability (~1500%) and remarkable conductivity (7.69 mS/cm).
