当前位置: X-MOL 学术Polymer › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of counterion type on dielectric and electrorheological responses of poly(ionic liquid)s
Polymer ( IF 4.6 ) Pub Date : 2017-11-06 , DOI: 10.1016/j.polymer.2017.11.007
Yuezhen Dong , Yang Liu , Bo Wang , Liqin Xiang , Xiaopeng Zhao , Jianbo Yin

Different from classic water activated polyelectrolytes, poly(ionic liquid)s (PILs) bearing hydrophobic counterions show high electrorheological (ER) response in dry state. This offers opportunity for practical applications of polyelectrolyte-based ER materials in wide temperature region. For guiding the design of PIL-based ER materials with improved performance, understanding the structure-property relationship is very important. In this paper, a series of poly(p-vinylbenzyl trimethylammonium)-based PIL particles with different counteranions ([PVBTMA][X]) were synthesized with the goal of understanding the role of mobile counterions on ER response of PILs. To exclude particle shape effect, the PIL series were controlled to be monodisperse spheres with a similar diameter via microwave-assisted dispersion polymerization. Under electric fields, the ER response of PIL particles when dispersed in insulating oil was investigated by temperature-modulated rheological test. It showed that the ER response of PILs depends on the type of counteranions. The order of magnitude of ER response of PILs with different counteranion is trifluoromethanesulfonate (TfO) > tetrafluoroborates (BF4) > bis-(trifluoromethanesulfonylimide) (TFSI) > hexafluorophosphates (PF6). The mechanism behind the influence of counterion type on ER response was analysed by dielectric relaxation spectroscopy. It demonstrated that the influence of counteranion type on ER response may be related to the variation of size and plasticization effect of counteranions that has altered the transport dynamic of mobile counterions and ion motion-induced interfacial polarization.



中文翻译:

抗衡离子类型对聚离子液体介电和电流变响应的影响

与经典的水活化聚电解质不同,带有疏水抗衡离子的聚离子液体(PIL)在干燥状态下显示出较高的电流变(ER)响应。这为在宽温度范围内基于聚电解质的ER材料的实际应用提供了机会。为了指导性能更高的基于PIL的ER材料的设计,了解结构性质关系非常重要。在本文中,一系列的聚(p合成具有不同抗衡离子([PVBTMA] [X])的基于-乙烯基苄基三甲基铵)的PIL颗粒,其目的是了解移动抗衡离子对PIL的ER反应的作用。为了排除颗粒形状的影响,通过微波辅助分散聚合将PIL系列控制为具有相似直径的单分散球体。在电场下,通过温度调节流变试验研究了分散在绝缘油中的PIL颗粒的ER响应。结果表明,PIL的ER反应取决于抗衡阴离子的类型。具有不同抗衡阴离子的PIL的ER响应的数量级为三氟甲磺酸盐(TfO -)>四氟硼酸盐(BF 4 -)>双-(三氟甲磺酰亚胺)-)>六氟磷酸盐(PF 6 - )。通过介电弛豫谱分析了抗衡离子类型对ER响应的影响的机理。结果表明,抗衡离子类型对内质网响应的影响可能与抗衡阴离子的大小和增塑作用的变化有关,后者改变了可移动抗衡离子的传输动力学和离子运动引起的界面极化。

更新日期:2017-11-06
down
wechat
bug