Dynamic Viscoelasticity and Birefringence of Poly(ionic liquids) in the Vicinity of Glass Transition Zone
Dynamic Viscoelasticity and Birefringence of Poly(ionic liquids) in the Vicinity of Glass Transition Zone
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DOI：
10.1021/ma4010814
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发表时间：
2013-08-13
期刊：
影响因子：
5.5
通讯作者：
Nakamura, Kenji
中科院分区：
文献类型：
--
作者：
Inoue, Tadashi;Matsumoto, Atsushi;Nakamura, Kenji
研究了两种聚离子液体PC 4VITfO和PC 4VITFSI的动态粘弹性和双折射，以阐明PIL粘弹性响应的分子起源。根据先前的研究，具有较大抗衡离子的PC 4VITFSI显示出比PC 4VITfO更宽的玻璃-橡胶过渡区周围的粘弹性弛豫谱。流变光学数据进行了分析与修改的应力-光学规则：PC 4VITfO的复杂的模量被分离成两个组件，橡胶和玻璃态的组件，类似于普通的无定形聚合物，而对于PC 4VITFSI系统的一个额外的组件是必要的，除了两个普通的组件进行合理的分离。从频率依赖性，额外的组件归因于子劳斯模式的链，这是增强的抗衡离子减少链间的相互作用。
Dynamic viscoelasticity and birefringence of two poly-(ionic liquid)s, PC4VITfO and PC4VITFSI, are investigated to clarify the molecular origin of viscoelastic response of PILs. According to a previous study, PC4VITFSI having larger counterions shows a broader viscoelastic relaxation spectra around the glass-to-rubber transition zone than PC4VITfO. The rheo-optical data were analyzed with the modified stress-optical rule: The complex modulus for PC4VITfO was separated into two components, the rubbery and the glassy component, similarly to the ordinary amorphous polymers while for PC4VITFSI system an additional component was necessary in addition to the two ordinary components for a reasonable separation. From the frequency dependence, the additional component was attributed to the sub-Rouse mode of chain which is enhanced by the counterions decreasing the interchain interactions.