Effect of ionic liquid structure on viscoelastic behavior of hydrogen-bonded micellar ion gels

POLYMER

卷:178

Article

Tamate, Ryota^1,2  Hashimoto, Kei¹  Li, Xiang³  Shibayama, Mitsuhiro³  Watanabe, Masayoshi¹ 

[1] Yokohama Natl Univ, Dept Chem & Biotechnol, Hodogaya Ku, 79-5 Tokiwadai, Yokohama, Kanagawa 2408501, Japan

[2] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[3] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwano Ha, Kashiwa, Chiba 2778581, Japan

关键词: Ion gel;    Block copolymer;    Ionic liquid;   

DOI  :  10.1016/j.polymer.2019.121694

来源: Elsevier

【 摘 要 】

Ion gels based on block copolymer self-assembly in ionic liquids (ILs) are attractive, processable, non-volatile, ion-conducting soft materials. Recently, a new class of ion gels based on hydrogen bonding between jammed block copolymer micelles in ILs that shows good mechanical strength and rapid self-healing ability has been developed. Herein, the effect of IL cation and anion structures on the microstructures and viscoelastic properties of a hydrogen-bonded micellar ion gel is reported. It was clarified that competition among cations, anions, and polymer chains for hydrogen bonding significantly affects the viscoelastic behavior of the ion gel. In the case of weak hydrogen bonding for ILs, macroscopic phase separation occurs due to strong hydrogen bonding between diblock copolymer micelles, resulting in an opaque and fragile ion gel, whereas storage and loss moduli are significantly reduced for ILs showing strong hydrogen bonding. Control of competitive hydrogen bonding interaction between polymers and ILs is thus critical to obtaining the desirable physical properties for ion gels.

【 授权许可】

Free