Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

Okada, Yuki; Goto, Yuka; Tanaka, Ryouichi; Katashima, Takuya; Jiang, Xinyue; Terao, Ken; Sato, Takahiro; Inoue, Tadashi

doi:10.1021/acs.macromol.8b01582

Cited by 13 publications

(16 citation statements)

References 45 publications

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“…For ω a T > 10 7 rad s –1 , the dependence of G * on ω of the neat solvent was close to those of the PC 4 -TFSI solution at c p = 0.250 M. However, as the frequency decreased from 10 7 rad s –1 to 10 5 rad s –1 , the values of G * for the PC 4 -TFSI solution started to deviate toward low frequencies in comparison to those of the neat solvent. A similar deviation was observed for solutions of polymers with higher glass transition temperatures than those of solvents and accounted for by the increase in local friction due to the cooperative motions of polymer chains and solvent molecules. , When ω a T < 10 5 rad s –1 , the value of the storage modulus G ′ was significantly larger than that of the neat solvent, corresponding to the polymer relaxation processes. We observed a similar trend of G * at c IL = 2.53 M between the PC 4 -TFSI solution at c p = 0.250 M and the neat solvent (see Figure S11 of the Supporting Information).…”

Section: Resultssupporting

confidence: 63%

“…A similar deviation was observed for solutions of polymers with higher glass transition temperatures than those of solvents and accounted for by the increase in local friction due to the cooperative motions of polymer chains and solvent molecules. 93,102 When ωa T < 10 5 rad s −1 , the value of the storage modulus G′ was significantly larger than that of the neat solvent, corresponding to the polymer relaxation processes. We observed a similar trend of G* at c IL = 2.53 M between the PC 4 -TFSI solution at c p = 0.250 M and the neat solvent (see Figure S11 of the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in the Semidilute Unentangled Regime from Low to High Salt Concentrations

et al. 2021

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Polymerized ionic liquids (PILs) are a special class of ion-containing polymers with ionic liquid structures. The viscoelastic properties of PILs in IL solutions are expected to be influenced by both polymer−polymer interaction and charge screening by IL ions, which becomes complex at high IL concentrations due to strong ionic correlations. In this work, we aim to understand the effect of the ionic correlations on the shear rheology of PIL in IL solutions in the semidilute unentangled (SU) polymer regime, with moderate polymer−polymer interactions. We conducted systematic rheological characterization of a PIL, poly(1butyl-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide), in a mixture of an IL, 1-butyl-3-methylimidazolium bis-(trifluoromethanesulfonyl)imide, and a non-ionic solvent, dimethylformamide, to evaluate the specific viscosity η sp and the longest relaxation time λ with varying IL concentrations c IL , at a fixed polymer concentration. We found that both η sp and λ initially decreased with the increasing c IL , following the scaling theory of polyelectrolyte solutions in the low salt concentration regime. However, these values exhibited an upturn at high c IL . We explained the observed non-monotonic viscoelastic behavior by proposing a charge screening model for SU solutions, accounting for both modified screening length in concentrated IL solutions and complete charge screening. Our results demonstrate how the strong ionic correlation in concentrated IL solutions modifies the electrostatics of PILs and their corresponding viscoelastic properties in the presence of moderate polymer−polymer interactions.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in the Semidilute Unentangled Regime from Low to High Salt Concentrations

et al. 2021

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“…SOR is derived initially for the strain-induced birefringence of cross-linked systems such as rubber and gels and later extended to the stress relaxation process of rubbery materials such as polymer melts and concentrated solutions. Later, it has been shown that the SOR applies not only to the orientational birefringence of rubbery materials in the linear viscoelastic region but also to other polymeric systems, including inhomogeneous materials even for in the nonlinear region. − The investigation of proportionality coefficient C provides detailed information on the molecular origin of the stress. Rheo-optical measurements based on the simultaneous measurements of strain-induced stress and birefringence have been utilized to explore the relationship between viscoelasticity and concentrated dispersion structure. − …”

Section: Birefringence Of Microgel Suspensionsmentioning

confidence: 99%

Rheo-Optical Study on the Viscoelastic Relaxation Modes of a Microgel Particle Suspension around the Liquid–Solid Transition Regime

Urakawa

Inoue

2021

Macromolecules

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Dynamic viscoelasticity and dynamic birefringence of a microgel system were investigated around the liquid–solid transition concentration to clarify the molecular origin of the viscoelastic response of the microgel system. The complex modulus showed viscoelastic liquid-like behavior at concentrations, c, below a threshold c jamming for random close packing of the microgels, whereas viscoelastic solid-like behavior at c > c jamming. The imaginary part of the complex strain-optical coefficient changed its sign with increasing angular frequency ω in a liquid-like regime, suggesting that the stress and birefringence involved three relaxation mechanisms. Utilizing the stress-optical rule, SOR, for each relaxation process, the complex shear modulus at c < c jamming was separated into the orientational stress of network strands in temporary contacted microgels, deformation of particle, and the redistribution process, from high frequencies in this order. On the other hand, in a solid-like regime at c > c jamming, the ordinary SOR held well with a single stress-optical coefficient, C, implying that only one stress origin is dominant, which can be attributed to the orientational stress of densely packed microgels in permanent contact. The strain-optical coefficients evaluated using the Onuki–Doi theory reproduced the measurements qualitatively and supported these assignments.

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“…Research on polymer fluids using FIB measurement has a long history, and the sensitivity of the FIB depends on the origin of the stress. Recently, mode separation (e.g., orientation mode, glass mode) of various polymer fluids has been reported by means of measuring FIB and viscoelasticity simultaneously (the rheo-optical method) [15][16][17][18] . Furthermore, Shangwei et al 19) examined the dynamics of microgel particle dispersions using the rheo-optical method and reported the method as being appropriate for researching microgel particles on a microscopic level.…”

Section: Couette Flowmentioning

confidence: 99%

Experimental Studies of Flow-Induced Birefringence in Complex Fluids

Sato

2022

J. Soc. Rheol., Jpn

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To elucidate the mechanism for flow phenomena in complex fluids, it is crucial to analyze the associated flow-induced structures both experimentally and numerically. Flow-induced birefringence (FIB) measurement is an optical measurement that is very useful for analyzing flow-induced structures in complex fluids, which is why many studies have used the FIB technique. Furthermore, various recent studies have developed new devices for measuring FIB. Reviewed briefly here are recent experimental studies that have applied the FIB technique to complex fluids such as surfactant solutions, fiber suspensions, and polymer fluids.

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Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

Cited by 13 publications

References 45 publications

Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in the Semidilute Unentangled Regime from Low to High Salt Concentrations

Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in the Semidilute Unentangled Regime from Low to High Salt Concentrations

Rheo-Optical Study on the Viscoelastic Relaxation Modes of a Microgel Particle Suspension around the Liquid–Solid Transition Regime

Experimental Studies of Flow-Induced Birefringence in Complex Fluids

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