Phase diagrams and rheological properties of cellulose ether solutions in magnetic field

Вшивков, С. А.; Rusinova, E. V.; Galyas, A. G.

doi:10.1016/j.eurpolymj.2014.07.042

Cited by 25 publications

(14 citation statements)

References 40 publications

(64 reference statements)

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“…However, the viscosity of the PDMS-aerosil system in the field grows substantially, although the viscosity of PDMS does not change in a magnetic field. An increase in the viscosity of polymer solutions under application of a magnetic field is observed for a series of cellulose ethersolvent systems, i.e., for the polymers with the moderate chain rigidity [70][71][72][73][74][75][76]. According to the developed theory of interaction between diamagnetic macromolecules and their associates with the magnetic field [31][32][33], the effect of the field can manifest itself under the following conditions: a particle must be anisodiametrical; the particle volume must be higher than the corresponding critical value Vcr; and the medium must be low-viscosity.…”

Section: Magnetorheological Properties Of Paramagnetic Systems Contaimentioning

confidence: 99%

“…It should be noted that up to now there is only one theoretical [69] and some experimental works [70][71][72][73][74][75][76] in which an influence of the magnetic field on rheological properties of polymer solutions is considered. Note that practically no information is available on the relaxation character of the rheological behavior of polymer solutions in the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Rheology

2018

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The results of researches of a magnetic field effect on rheological properties of both paramagnetic, and diamagnetic polymer systems are described. Influence of intensity and the direction of power lines of the magnetic field on the viscosity of magnetic liquids and magnetorheological suspensions is analyzed. Results of theoretical researches of the magnetic field effect on the diamagnetic macromolecule orientation in solutions are discussed. The data on the influence of the magnetic field on rheological parameters of cellulose ether solutions are generalized and analyzed. The rheological parameters are compared with a change of studied system structure under magnetic field. The concentration dependences of viscosity and the sizes of supramolecular particles in solutions are compared. The rheological behavior of systems in a region of phase transitions is considered. Concentration dependences of the viscosity are described by curves with a maximum which concentration corresponds to a phase transition concentration.

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Section: Magnetorheological Properties Of Paramagnetic Systems Contaimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer Rheology

2018

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“…HPC employed in this study shows meso phase at ~60 wt% in DMF. Phase diagram of HPC/ DMF has been reported previously [12]. First, EFE and TBAP (supporting salt) were dissolved in DMF.…”

Section: Electrochemical Polymerizationmentioning

confidence: 99%

“…Experimental 2.1. Materials EFE was previously synthesized [12]. Hydroxypropyl cellulose (HPC) was obtained from Wako Pure Chemical Industries, Ltd. (TCI, Japan) and used without further purification.…”

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confidence: 99%

Synthesis of electro-optically active polymer composite of poly[2,2'-bis(3,4-ethylenedioxythiophene)-alt-fluorene]/hydroxypropyl cellulose showing liquid crystal structure

Eguchi¹,

Kawabata²,

Goto³

2017

Express Polym. Lett.

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Abstract. Electrochemical preparation of a composite consisting of poly[2,2′-bis(3,4-ethylenedioxythiophene)-alt-fluorene] and hydroxypropyl cellulose (PEFE/HPC) was carried out. We conducted electrochemical polymerization of poly[2,2′-bis(3,4-ethylenedioxythiophene)-alt-fluorene] (EFE) as a monomer in a lyotropic liquid crystal of HPC. We used an organic solvent instead of water for lyotropic liquid crystal medium to expand the possibility of the range of monomers, although water is usually employed as a solvent for HPC for showing liquid crystallinity. Here, we employed N,N-dimethylformamide (DMF) as a solvent for HPC. Electrochemical polymerization in the polymer liquid crystal was carried out to obtain a polymer film with liquid crystal order. The polymer film thus prepared exhibited optical activity. Fourier transfer infrared (FT-IR) absorption spectroscopy reveals that the film is a composite consisting of HPC and polymer. The composite PEFE/HPC thus prepared in HPC/DMF system showed electrochromism.

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“…Обнаружен пороговый характер воздействия магнитного поля на фазовые ЖК переходы в растворах эфиров целлюлозы [2], что согласуется с теоретическими представлениями [1]. Кроме того, под действием магнитного поля вязкость растворов эфиров целлюлозы, как правило, возрастает, и увеличиваются размеры надмолекулярных частиц [3,4]. Имеются немногочисленные сведения о влиянии магнитного поля на структуру и свойства полимеров в твердом состоянии [5,6].…”

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