Viscoelastic Behavior of Polymerized Ionic Liquids with Various Charge Densities

Nakamura, Kenji; Fukao, Koji; Inoue, Tadashi

doi:10.1678/rheology.41.21

Cited by 6 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synthesis of poly(1-butyl-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide (PC 4 -TFSI) was carried out in the same method as reported previously [ 21 , 22 , 23 , 25 ] (see Figure 3 ). 1-Vinylimidazolium bromide (C 4 -Br) was first synthesized by quaternizing 1-vinylimidazole with the excess amount of 1-bromobutane in methanol for 2 days at 50 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Nakamura and co-workers examined the viscoelastic spectrum of several kinds of PILs spanning from the glass to terminal regions [ 21 , 22 , 23 , 24 , 25 ]. They observed a specific relaxation in the glass-to-rubber transition region when the counterions are relatively large in sizes, such as bis(trifluoromethane sulfonyl imide) (TFSI), 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide (CPFSI), and nonafluorobutane sulfonate (NfO), whose structures are shown in Figure 1 [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Viscoelastic Relaxation of Polymerized Ionic Liquid and Lithium Salt Mixtures: Effect of Salt Concentration

et al. 2021

Self Cite

View full text Add to dashboard Cite

Polymerized ionic liquids (PILs) doped with lithium salts have recently attracted research interests as the polymer component in lithium-ion batteries because of their high ionic mobilities and lithium-ion transference numbers. To date, although the ion transport mechanism in lithium-doped PILs has been considerably studied, the role of lithium salts on the dynamics of PIL chains remains poorly understood. Herein, we examine the thermal and rheological behaviors of the mixture of poly(1-butyl-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide (PC4-TFSI)/lithium TFSI (LiTFSI) in order to clarify the effect of the addition of LiTFSI. We show that the glass transition temperature Tg and the entanglement density decrease with the increase in LiTFSI concentration wLiTFSI. These results indicate that LiTFSI acts as a plasticizer for PC4-TFSI. Comparison of the frequency dependence of the complex modulus under the iso-frictional condition reveals that the addition of LiTFSI does not modify the stress relaxation mechanism of PC4-TFSI, including its characteristic time scale. This suggests that the doped LiTFSI, component that can be carrier ions, is not so firmly bound to the polymer chain as it modifies the chain dynamics. In addition, a broadening of the loss modulus spectrum in the glass region occurs at high wLiTFSI. This change in the spectrum can be caused by the responses of free TFSI and/or coordination complexes of Li and TFSI. Our detailed rheological analysis can extract the information of the dynamical features for PIL/salt mixtures and may provide helpful knowledge for the control of mechanical properties and ion mobilities in PILs.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Viscoelastic Relaxation of Polymerized Ionic Liquid and Lithium Salt Mixtures: Effect of Salt Concentration

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…They concluded that ion transport is initiated by the formation and dissociation of ion pairs. 148 In contrast, the aforementioned segmental motion was not clearly observed in their other studies, 145,146 likely because of the significant effects of EP and DC conductivity. However, a follow-up study for the same PILs suggested a segmental DR mode in addition to the side-chain and ion-pair modes.…”

Section: Dielectric Relaxation Modes In Pilsmentioning

confidence: 86%

“…Their study discovered two main DR processes and modes 145 : (1) a faster mode caused by the rotational dynamics of the polymer side chain and (2) a slower mode due to the segmental motion of the same chain. However, a rheological study 148 by the same group gave further insights into the origin of slower mode and instead attributed it to the ion‐pair formation. They concluded that ion transport is initiated by the formation and dissociation of ion pairs 148 .…”

Section: Dielectric Relaxation For Pilsmentioning

confidence: 99%

“…However, a rheological study 148 by the same group gave further insights into the origin of slower mode and instead attributed it to the ion‐pair formation. They concluded that ion transport is initiated by the formation and dissociation of ion pairs 148 . In contrast, the aforementioned segmental motion was not clearly observed in their other studies, 145,146 likely because of the significant effects of EP and DC conductivity.…”

Section: Dielectric Relaxation For Pilsmentioning

confidence: 99%

See 1 more Smart Citation

Polarization of ionic liquid and polymer and its implications for polymerized ionic liquids: An overview towards a new theory and simulation

Gao

Itliong

Kumar

et al. 2021

Journal of Polymer Science

View full text Add to dashboard Cite

Ionic liquid (IL)‐containing polymers garner attention for electrochemical applications. This article overviews recent experimental and theoretical studies of polymer electrolytes that would be likely to cultivate new theoretical and computational frameworks for IL‐containing polymers. The first two sections outline the uniqueness of ILs that differentiates them from inorganic salts in polymers and explore deviation from the concept of the metaphor “room‐temperature molten salt.” Such distinct properties include (1) large intrinsic dipole moment and electronic polarizability, (2) hydrogen bonding, (3) π‐interactions, (4) a broad distribution of charges over the entire ion, and (5) the anisotropy of the ions. Moreover, the complexity of these properties substantially increases when the ions are polymerized. Indeed, their exceptional features would overcome the hurdle due to a trade‐off between ionic conductivity and mechanical robustness in inorganic salt‐doped polymers. Given these facts, the rest of the article focuses on emerging trends in the study of the dielectric response, phase separation, ion conductivity, and mechanical robustness of the polymer electrolytes, highlighting outstanding observations in experiments that may inspire existing theory and simulation. Our discussion also includes improving computational complexity for IL‐containing polymers. To this end, recent machine learning studies that consider ILs and polymer liquids are presented.

show abstract

Dielectric relaxation behavior of polymerized ionic liquids with various charge densities

Nakamura

Fukao

2013

Polymer

View full text Add to dashboard Cite

Viscoelastic Behavior of Polymerized Ionic Liquids with Various Charge Densities

Cited by 6 publications

References 27 publications

Viscoelastic Relaxation of Polymerized Ionic Liquid and Lithium Salt Mixtures: Effect of Salt Concentration

Viscoelastic Relaxation of Polymerized Ionic Liquid and Lithium Salt Mixtures: Effect of Salt Concentration

Polarization of ionic liquid and polymer and its implications for polymerized ionic liquids: An overview towards a new theory and simulation

Dielectric relaxation behavior of polymerized ionic liquids with various charge densities

Contact Info

Product

Resources

About