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

Куличихин, В. Г.; Ilyin, Sergey O.; Миронова, М. В.; Berkovich, A. K.; Nifant’ev, Ilya E.; Malkin, A. Ya.

doi:10.1002/adv.21758

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…It can be seen from Fig. 4 that system viscosities stay quite low when MWCNTs are used-the same as already observed for stable nanotubes dispersions in polyacrylonitrile solutions [40] and bitumen [41]. In general, an exponential growth of the system viscosity is observed with an increase in nanofiller volume content u (Fig.…”

Section: Rheology Of Epoxy-nanofillers Systemssupporting

confidence: 78%

Epoxy nanocomposites as matrices for aramid fiber‐reinforced plastics

et al. 2017

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Rheological and mechanical properties of nanofilled epoxy resin were studied, including adhesion to aramid fibers and strength of impregnated aramid strands. Light scattering and rheological measurements data imply that nanodiamonds (NDs) and multiwall carbon nanotubes form stable nanosized agglomerates in epoxy resin, whereas for epoxy‐organomodified montmorillonite systems, individual clay platelets orientation might be present. Also, according to the rheology of these systems, formation of the networks of epoxy molecules adsorbed on the NDs particle surface is suggested. Increase in the viscosity of the epoxy oligomers due to the nanoparticles incorporation results in the worsening of the impregnation of the aramid fibers by these formulations. However, enhanced adhesion properties could be obtained when using nanofillers, with a maximum at 1–2 wt% of nanofillers. A 25–35% growth of the pull‐out adhesion strength is also achieved. Increased cohesive strength and decreased residual stresses are supposed to be the reasons of adhesion strength decrease according to the literature. Adhesion strength increase was accompanied by a 10% enhancement of the strength of impregnated aramid strands. Moreover, a notable effect—up to a fourfold increase—was observed for the impact toughness of epoxy‐nanofillers samples. POLYM. COMPOS., 39:E2167–E2174, 2018. © 2017 Society of Plastics Engineers

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Section: Rheology Of Epoxy-nanofillers Systemssupporting

confidence: 78%

Epoxy nanocomposites as matrices for aramid fiber‐reinforced plastics

et al. 2017

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“…A detailed rheological analysis of basic PAN solutions was presented in . For this part of the work, we chose three samples with chemical compositions that had been examined before, namely samples containing sodium itaconate (SI_PAN), acrylic acid (AN114), and methyl itaconate (AN91).…”

Section: Methodsmentioning

confidence: 99%

“…Part 1 of this work was devoted to the detailed characterization and properties of different copolymer solutions . However, we would like to mention that as a general rule we made use of rather standard copolymers with only one original aspect: all copolymers were synthesized in a supercritical CO 2 medium.…”

Section: Introductionmentioning

confidence: 99%

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

et al. 2016

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Based on the results of Part 1 of this work, we have chosen acrylonitrile copolymers for preparing dopes in dimethyl sulfoxide (DMSO). Modeling the spinning process in static conditions was carried out by following the evolution of the interaction between a drop of solution and precipitant. In addition, the diffusion zone was controlled by the laser-interference method. Fibers were spun on a laboratory stand. It was found that the optimal ratio of DMSO to water in a coagulation bath was 85/15. The analysis of the structure of different fibers (including fibers with carbon nanotubes) demonstrated the superposition of crystalline phase and orientation-disordered mesophase. The evolution of this structure could provide the answer to the question of which structure of "white" fibers is best for obtaining high-quality "black" fibers. Measurement of the structure and mechanical properties of fibers allowed us to optimize the technology of thermal treatment of fibers including the intensity of heat output in the stages of thermal-oxidative stabilization and carbonization as well as the strain characteristics and applied tension. Model carbon fibers have a satisfactory complex of mechanical properties. We aimed to choose a set of experimental approaches as a proper way to produce high-strength carbon fibers.

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“…Other structured polymer solutions, e.g. of polyacrylonitrile [66][67][68] and of vinyl acetate/vinyl alcohol copolymers, 69 demonstrate similar non-Newtonian behavior.…”

Section: Rheology Of Solutions and Gels Dmso/fa Mediummentioning

confidence: 98%

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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Sulfonated poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenyleneoxy-1,4-phenylene), poly(1,3,4-oxadiazole-2,5-diyl-10,10-dioxophenoxathiine-2,8-diyl) and their copolymers were one-pot synthesized in fuming sulfuric acid with the use of 4,4 0-oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non-fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi-dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470°C, respectively. The ionic conductivity of the films under direct current conditions was 0.001-0.01 ∼S cm-1 for sodium cations and 0.3-1 mS cm-1 for protons.

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

Cited by 22 publications

References 10 publications

Epoxy nanocomposites as matrices for aramid fiber‐reinforced plastics

Epoxy nanocomposites as matrices for aramid fiber‐reinforced plastics

From Polyacrylonitrile, its Solutions, and Filaments to Carbon Fibers II. Spinning PAN‐Precursors and their Thermal Treatment

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

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