Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

Ilyin, Sergey O.; Черникова, Е. В.; Kostina, Yu. V.; Куличихин, В. Г.; Malkin, A. Ya.

doi:10.1134/s0965545x15040070

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…The values are in line with the available literature values for other polymer systems ,,, in dilute and semidilute systems, with the former reflected as such in good models for polymer systems developed by Wiśniewska et al , for PEG/PEO-water. As before with PDMS-ethyl acetate systems, the obtained data for a remain applicable for all of these polymer systems of all different molecular weights.…”

Section: Results and Discussionsupporting

confidence: 89%

“…Power law relationships for the hydrodynamic radius, R h , for the three new polymer-solvent systems studied here were obtained from the DLS measurement data. Within the limits of empirical values available for other polymer systems ,, as well as other polymer-solvent systems, − the fit of R h and R g with eq formulated the following relations for all our polymer systems as shown in Table . In these results, all radii in are nanometers and all molecular weights are in g/mol.…”

Section: Results and Discussionmentioning

confidence: 99%

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Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

Agasty

Wiśniewska

Kalwarczyk

et al. 2021

ACS Appl. Polym. Mater.

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The effective viscosity in polymer solutions probed by diffusion of nanoparticles depends on their size. It is a well-defined function of the probe size, the radius of gyration, mesh size (correlation length), activation energy, and its parameters. As the nanoparticle’s size exceeds the radius of gyration of polymer coils, the effective viscosity approaches its macroscopic limiting value. Here, we apply the equation for effective viscosity in the macroscopic limit to the following polymer solutions: hydroxypropyl cellulose (HPC) in water, polymethylmethacrylate (PMMA) in toluene, and polyacrylonitrile (PAN) in dimethyl sulfoxide (DMSO). We compare them with previous data for PEG/PEO in water and PDMS in ethyl acetate. We determine polymer parameters from the measurements of the macroscopic viscosity in a wide range of average polymer molecular weights (24–300 kg/mol), temperatures (283–303 K), and concentrations (0.005–1.000 g/cm3). In addition, the polydispersity of polymers is taken into account in the appropriate molecular weight averaging functions. We provide the model applicable for the study of nanoscale probe diffusion in polymer solutions and macroscopic characterization of different polymer materials via rheological measurements.

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Section: Results and Discussionsupporting

confidence: 89%

Section: Results and Discussionmentioning

confidence: 99%

Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

Agasty

Wiśniewska

Kalwarczyk

et al. 2021

ACS Appl. Polym. Mater.

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“…It is rather interesting that the effect of association was enhanced with the decrease in molecular weight of PAN: the larger is the size of the macromolecular clusters, the smaller is the molecular weight of PAN. However, one should keep in mind that the bonds in such clusters were weak since they break under intensive shearing …”

Section: Resultsmentioning

confidence: 96%

From Polyacrylonitrile, Its Solutions, and Filaments to Carbon Fibers: I. Phase State and Rheology of Basic Polymers and Their Solutions

et al. 2016

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The phase state and rheological properties of dimethyl sulfoxide (DMSO) solutions of a series of acrylonitrilebased copolymers (PAN), which were obtained by suspension polymerization and synthesized in supercritical CO 2 , have been studied. For PAN-DMSO (plus water) solutions, a bimodal amorphous phase equilibrium takes place at~78°C. Comparison of the rheological behavior of homo-and copolymer solutions has shown that the presence of carboxylate ion(s) in the macromolecular chain leads to supramolecular structure formation. Small additions of non-solvent (water) enhance the viscoelasticity of the solution, whereas a large amount of water results in gel formation; beyond a certain threshold of water concentration, macroscopic phase separation takes place. Addition of carbon nanotubes into the solution does not change their phase state or rheological behavior. Application of mechanical forces to concentrated solutions may cause specific phase separation without the addition of a non-solvent.

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“…Supplemental to ref. ) was estimated using Martin equation (with numerical prefactor 0.23 in the exponent):

η \approx 15 η_{s} \approx 0.3 P

. The predicted jet life‐time

τ_{vis} \approx 0.3 ms

appears to be much shorter than the experimental elongation time

t^{*} \sim 60 ms

.…”

Section: Discussionmentioning

confidence: 95%

Phase separation kinetics in unentangled polymer solutions under high‐rate extension

Semenov

Субботин

2017

J Polym Sci B Polym Phys

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Phase separation processes following high‐rate extension in unentangled polymer solutions are studied theoretically. The flow‐induced demixing is associated with the coil–stretch transition predicted in high‐molecular‐weight polymer solutions at high‐enough Weissenberg numbers. The developed mean‐field theory is valid in the dilute/semidilute solution regime, where the stretched coils overlap strongly. We elucidate and discuss the main kinetic stages of the polymer/solvent separation process including (i) growth of concentration fluctuations and formation of oriented protofibrils by anisotropic spinodal decomposition; (ii) development of well‐defined highly oriented and stiff fibrils forming an anisotropic network (cross‐linked fiber); (iii) microphase separation and lateral collapse of the network yielding dense oriented fiber. These novel predictions are in qualitative agreement with the experimental data. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 623–637

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Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

Cited by 13 publications

References 28 publications

Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

From Polyacrylonitrile, Its Solutions, and Filaments to Carbon Fibers: I. Phase State and Rheology of Basic Polymers and Their Solutions

Phase separation kinetics in unentangled polymer solutions under high‐rate extension

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