Synthesis and Ionic Conductivity of Cyclosiloxanes with Ethyleneoxy-Containing Substituents

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• 作者：Zhengcheng Zhang ; Leslie J. Lyons ; Jay J. Jin ; Khalil Amine ; and Robert West
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：November 15, 2005
• 年：2005
• 卷：17
• 期：23
• 页码：5646 - 5650
• 全文大小：104K
• 年卷期：v.17,no.23(November 15, 2005)
• ISSN：1520-5002

文摘

Pentamethylcyclopentasiloxanes (D₅^H) with oligo(ethylene glycol) substituents, D₅N3 and D₅S3, anda short-chain siloxane derivative MD₆N3M were synthesized by B(C₆F₅)₃-catalyzed dehydrogenativecoupling and by platinum-catalyzed hydrosilylation reactions. Conductivities were studied when dopedwith lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). The oxygen-linked cyclic siloxane D₅N3 exhibitshigher conductivity than trimethylene-linked siloxane D₅S3. The substituted linear oligmeric siloxaneMD₆N3M has a lower T_g than the D₅ siloxanes, and showed much higher conductivity at the same Li⁺concentration. The curvature of the plot of conductivity vs temperature dependence indicates a free volumemechanism of ion transport.