Highly accelerated crystallization kinetics of poly(ethylene oxide)/ionic liquid mixtures by phase separation: The coupling effect of hydrogen bonds breaking

Chen, Yunlei; Luo, Huan; Xiao, Zhilin; Niu, Yanhua; Li, Guangxian

doi:10.1016/j.polymer.2019.03.026

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…Previous studies have shown that polymer/MIL systems could exhibit unusual phase separation or self-assembly behaviors, which are closely related to the hydrogen bonding and electrostatic interactions between the polymer and ILs, as well as the cohesive energy and aggregation of ILs. − Among them, the role of hydrogen bonding interaction is particularly prominent in the poly(ethylene oxide) (PEO)/IL system . In our previous work, the hydrogen bonds destruction and reconstruction, phase separation kinetics, and special rheological responses in the process of phase transition for PEO/1-ethyl-3-methylimidazolium tetrafluoroborate (PEO/[C 2 (mim)][BF 4 ]) were also systematically investigated. − In addition, Son et al studied the conformation and dynamic properties of a single PEO chain in 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 (mim)][BF 4 ]) by establishing a nonpolarizable united atom force field. Results showed that the conformation of a single PEO chain included both ringlike and linear segments, and the long-time dynamics was consistent with the Zimm model.…”

Section: Introductionmentioning

confidence: 91%

Entanglement and Relaxation of Poly(methyl methacrylate) Chains in Imidazolium-Based Ionic Liquids with Different Cationic Structures

Kong

Niu

et al. 2020

Macromolecules

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A series of dicationic ionic liquids (DILs) with two singly charged imidazolium rings linked by different alkyl chain lengths (C4, C6, and C8) were first synthesized. The relaxation and entanglement of poly(methyl methacrylate) (PMMA) chains in both the DILs and conventional monocationic ionic liquids (MILs) with the same anion bis[(trifluoromethyl)sulfonyl]imide ([TFSI]−) were investigated by rheological and dynamic light scattering (DLS) measurements. PMMA in DILs exhibits lower critical entanglement concentration, slower relaxation behavior, and a denser entanglement network than in their MIL counterparts, and these differences become more pronounced as the alkyl chain length decreases. The double imidazolium ring structure that provides interaction sites with PMMA chains plays a dominant role in the relaxation and entanglement of the PMMA/DIL system. As a result, the PMMA/DILs show higher modulus, greater viscosity, and better gel recovery than the PMMA/MILs at the same volume fraction. In addition, a stronger dependence on alkyl chain length is also found in PMMA/DILs. With the increase of alkyl chain length, the relaxation of PMMA becomes faster and the entanglement molecular weight increases gradually, indicating the released mobility of polymer chains. Combined with the results of DLS, it is further confirmed that the greater degree of entanglement in PMMA/DILs mainly comes from the contribution of cohesional entanglement in the system.

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Section: Introductionmentioning

confidence: 91%

Entanglement and Relaxation of Poly(methyl methacrylate) Chains in Imidazolium-Based Ionic Liquids with Different Cationic Structures

Kong

Niu

et al. 2020

Macromolecules

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“…It has been reported that, in the hybrid system of IL and polymer, the addition of ILs often leads to the related groups in the blend to move to a low wavenumber, such as PEO/ILs system, cellulose/ILs system. [19][20][21] In addition, the interaction between the anions and cations of IL is greatly attenuated after the IL is melted. Fourth, the lifetime of the hydrogen bonds.…”

Section: Hydrogen Bonding Interactions Between Pva and Il In Normal Temperaturementioning

confidence: 99%

Study on the mechanism of hydrogen bonding interactions between poly(vinyl alcohol) and ionic liquid

Chen

Zuo

Chen

et al. 2021

Polymers for Advanced Techs

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“…In both the phase-separated and completely miscible PEO/MIL systems, the crystallization kinetics of PEO has also been investigated extensively. In the former case, it was found that the coupling effect of phase separation and the breaking of H bonding could significantly accelerate the PEO crystallization . In the fully miscible mixtures, MILs as the plasticization components could result in the reduced crystallization rate of PEO. , By changing the structure of serial MILs, it has been demonstrated that the anionic structure rather than the alkyl chain length as a dominant factor affects the melting point depression of PEO .…”

Section: Introductionmentioning

confidence: 99%

Chain Dynamics and Crystallization Behavior of Poly(ethylene oxide) in Imidazolium-Based Ionic Liquids with Different Cationic Structures

Luo

et al. 2022

Macromolecules

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The influence of two types of imidazolium-based ionic liquids (ILs) with different cation structures including dications (DILs) and monocations (MILs) on the dynamic and crystallization behaviors of poly(ethylene oxide) (PEO) was investigated. Both the DILs and MILs have the same bis[(trifluoromethyl)sulfonyl]imide ([TFSI]−) anion but contain variable alkyl chain lengths (C6 and C12 for DILs and C3 and C6 for MILs). It is demonstrated that even though the hydrogen-bonding interaction between PEO and DILs is slightly weaker than that between PEO and MILs, as evidenced by melting point depression and fitting results of Kwei equation, the relaxation of PEO chain in DILs is severely constricted because of the special dicationic structure of DILs, which plays a role as physical cross-links among PEO chains. However, it is more interesting that the spherulite growth rate and nucleation effects could be even enhanced in PEO/DIL mixtures. Accordingly, the activation energy for PEO diffusing across the interface between spherulites and supercooled melt, as estimated by the Lauritzen–Hoffman theory, is lower in PEO/DIL mixtures. This phenomenon could be interpreted from the formation of local ordered structure in the presence of physical networks, which might facilitate the crystallization of PEO. As the alkyl chain length of ILs becomes longer or the molecular weight of PEO increases, the difference in the crystallization kinetics of PEO in DILs and MILs reduces. In these cases, the network structure in PEO/DILs becomes looser, and the local ordered structure is difficult to be formed.

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Highly accelerated crystallization kinetics of poly(ethylene oxide)/ionic liquid mixtures by phase separation: The coupling effect of hydrogen bonds breaking

Cited by 4 publications

References 47 publications

Entanglement and Relaxation of Poly(methyl methacrylate) Chains in Imidazolium-Based Ionic Liquids with Different Cationic Structures

Entanglement and Relaxation of Poly(methyl methacrylate) Chains in Imidazolium-Based Ionic Liquids with Different Cationic Structures

Study on the mechanism of hydrogen bonding interactions between poly(vinyl alcohol) and ionic liquid

Chain Dynamics and Crystallization Behavior of Poly(ethylene oxide) in Imidazolium-Based Ionic Liquids with Different Cationic Structures

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