Sulfonimide-Containing Triblock Copolymers for Improved Conductivity and Mechanical Performance

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• 作者：Chainika Jangu ; Alice M. Savage ; Zhiyang Zhang ; Alison R. Schultz ; Louis A. Madsen ; Frederick L. Beyer ; Timothy E. Long
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：July 14, 2015
• 年：2015
• 卷：48
• 期：13
• 页码：4520-4528
• 全文大小：504K
• ISSN：1520-5835

文摘

Ion-containing block copolymers continue to attract significant interest as conducting membranes in energy storage devices. Reversible addition鈥揻ragmentation chain transfer (RAFT) polymerization enables the synthesis of well-defined ionomeric A鈥揃C鈥揂 triblock copolymers, featuring a microphase-separated morphology and a combination of excellent mechanical properties and high ion transport. The soft central 鈥淏C鈥?block is composed of poly(4-styrenesulfonyl(trifluoromethylsulfonyl)imide) (poly(Sty-Tf₂N)) with 鈭扴O₂鈥揘^{鈥?/sup>鈥揝O₂鈥揅F₃ anionic groups associated with a mobile lithium cation and low-T_g di(ethylene glycol)methyl ether methacrylate (DEGMEMA) units. External polystyrene A blocks provide mechanical strength with nanoscale morphology even at high ion content. Electrochemical impedance spectroscopy (EIS) and pulse-field-gradient (PFG) NMR spectroscopy have clarified the ion transport properties of these ionomeric A鈥揃C鈥揂 triblock copolymers. Results confirmed that well-defined ionomeric A鈥揃C鈥揂 triblock copolymers combine improved ion-transport properties with mechanical stability with significant potential for application in energy storage devices.}