Structure and inter-phase stability in solvent-free low-dimensional polymer electrolytes with high lithium conductivity
摘要:
用于合成两亲性聚合物聚[2,5,8,11,14-五氧杂十五亚甲基(5-烷氧基-1,3-亚苯基)]的两种Williamson程序
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(缩写 CmO5)进行了比较。方法X得到聚醚-酯;方法Y给出纯聚醚。在这两种情况下,脱水反应都会产生 CmO5-CmO1 共聚物。已经制备了具有和不具有界面稳定剂共聚物III的I与聚氧四亚甲基和聚氧三亚甲基共聚物(II)以及LiBF4的两相体系。 III 观察到具有较低温度依赖性的最高且最稳定的电导率(环境下>5 × 10−4 S cm−1),但方法 Y 中的 I 显示出在环境下发生相分离的趋势。
A polymer electrolyte being configured to provide ion transport, said polymer electrolyte comprising: a main-chain first repeating unit configured to provide a primary ion coordinating site, a plurality of main-chain repeating units being arranged as a substantially helical ion coordinating channel; said polymer electrolyte further comprising and being characterised by: a main-chain second repeating unit being interdispersed between said main-chain first repeating unit, said second repeating unit being configured to provide a secondary ion coordinating site within said coordinating channel, said secondary ion coordinating site being less coordinating then said primary ion coordinating site; wherein said polymer electrolyte is configured to provide ion transport within said coordinating channel involving ion transport between said primary ion coordinating site and said secondary ion coordinating site.
作者:Jade E. LaDow、David C. Warnock、Kristina M. Hamill、Kaitlin L. Simmons、Robert W. Davis、Christian R. Schwantes、Devon C. Flaherty、Jon A.L. Willcox、Kelsey Wilson-Henjum、Kevin L. Caran、Kevin P.C. Minbiole、Kyle Seifert
DOI:10.1016/j.ejmech.2011.06.026
日期:2011.9
A series of cationic amphiphiles, each with an aromatic core, was prepared and investigated for antimicrobial properties. The synthesized amphiphiles in this study are bicephalic (double-headed) in that they each possess two trimethylammonium head groups and a single linear alkoxy tail. Minimum inhibitory and minimum bactericidal concentrations of these amphiphiles were in the low micromolar range. Antimicrobial activities are highly sensitive to the chain length of the hydrophobic region, and modestly reliant on the relative positioning of the head groups on the aromatic core. These trends were more pronounced in time kill assays, wherein longer chain compounds required significantly shorter times to completely kill bacteria. Microscopy suggested that the mode of cell death was lysis. Strong inhibition was observed with both biscationic compounds and monocationic comparisons against Gram-positive bacteria: only biscationic amphiphiles maintained good activity versus the Gram-negative bacteria tested. These observations provide direction for future antimicrobial structural investigations. (C) 2011 Elsevier Masson SAS. All rights reserved.