Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s
Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s
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DOI：
10.1021/acs.macromol.8b02143
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发表时间：
2019-01-22
期刊：
影响因子：
5.5
通讯作者：
Sangoro, Joshua R.
中科院分区：
文献类型：
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作者：
Mapesa, Emmanuel U.;Chen, Mingtao;Sangoro, Joshua R.
采用宽带介电谱（BDS）和差示扫描量热法（DSC）研究了一系列咪唑类三嵌段共聚物（三嵌段共聚PILs）的离子动力学，并与其均聚物（homo-PILs）进行了比较。两个量热玻璃化转变温度（T-g）观察到相应的带电的聚（离子液体）（PIL）块和不带电的聚苯乙烯（PS）块。从Br-到NTf2-的变化使带电块的Tg降低超过50摄氏度，从而使室温离子直流电导率增加超过6个数量级。有趣的是，对于一个给定的阴离子，不同的体积分数的充电块，从类似0.5到类似0.8，具有非常小的影响，直流离子电导率，表明选择的counterparts是影响在这些系统中的电荷传输的关键因素。
Ion dynamics in a series of imidazolium-based triblock copolymers (triblock co-PILs) are investigated using broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC) and compared to their homopolymer counterparts (homo-PILs). Two calorimetric glass transition temperatures (T-g) are observed corresponding to the charged poly(ionic liquid) (PIL) blocks and noncharged polystyrene (PS) blocks. Varying the counterion from Br- to NTf2- decreases the T-g of the charged block by over 50 degrees C, thereby increasing the room-temperature ionic dc conductivity by over 6 orders of magnitude. Interestingly, for a given anion, varying the volume fraction of the charged block, from similar to 0.5 to similar to 0.8, has very minimal effect on the dc ionic conductivity, indicating that the choice of counterion is the key factor influencing charge transport in these systems.