Specific features of the copolymerization of acrylonitrile and acrylamide in the presence of low-molecular-mass and polymeric trithiocarbonates and properties of the obtained copolymers

Черникова, Е. В.; Kishilov, S. M.; Plutalova, A. V.; Kostina, Yu. V.; Бондаренко, Г. Н.; Baskakov, A. A.; Il'in, S. G.; Nikolaev, A. Yu.

doi:10.1134/s1560090414050029

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…(For itaconic acid, the value of ε known for malonic acid was used.) The compositions of the copolymers were calculated as described in [21]. As evidenced by the quantitative analysis, the copoly mer contained AN : MA : itaconic acid = 95.5 : 4.0 : 0.5 (mol %).…”

Section: Methodsmentioning

confidence: 99%

Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

et al. 2015

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The copolymer of acrylonitrile with methyl acrylate and itaconic acid (93 : 5.7 : 1.3) is synthesized via free radical copolymerization. For solutions of the initial copolymer and its 12 fractions in dimethyl sul foxide, viscosities are measured in a wide shear stress range. The viscosity behavior of 10% solutions is exam ined in more detail, and the rheological studies of several fractions are performed in the concentration inter val from 5 to 20%. All solutions exhibit weak non Newtonian behavior. This makes it possible to determine the zero shear viscosity. The dependences of this viscosity on the number average and weight average molec ular masses for the equiconcentrated solutions obey an exponential law with the same exponent, equal to 2.3. The macromolecules of copolymers are inclined toward association. For low molecular mass fractions, this effect is the most pronounced.

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Section: Methodsmentioning

confidence: 99%

Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

et al. 2015

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“…This technique has been successfully used for producing homopolymers and copolymers of AN with the desired MW, composition and monomer sequence distribution. 11,[46][47][48][49][50][51][52][53][54] In the present research we apply RAFT polymerization to the synthesis of copolymers of AN with MA, ethyl acrylate (EA), n-butyl acrylate (BA), 2-ethylhexyl acrylate (EHA) and lauryl acrylate (LA) in DMSO solution with monomer feed in the range 5-20 mol%. Here we report about the first comparative study of the thermal behavior of the resultant copolymers as a function of the length of the alkyl substituent in alkyl acrylate and the copolymer composition.…”

Section: Introductionmentioning

confidence: 99%

“…To minimize this factor and to form copolymers with a narrow molecular weight distribution (MWD) a reversible addition–fragmentation chain transfer (RAFT) polymerization can be applied. This technique has been successfully used for producing homopolymers and copolymers of AN with the desired MW, composition and monomer sequence distribution 11,46–54 …”

Section: Introductionmentioning

confidence: 99%

Reversible addition–fragmentation chain transferbased copolymers of acrylonitrile and alkyl acrylates as possible precursors for carbon fibers: synthesis and thermal behavior during stabilization

Томс

Balashov

Gervald

et al. 2021

Polymer International

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Copolymers of acrylonitrile and alkyl acrylates with various alkyl substituents (methyl, ethyl, butyl, 2‐ethylhexyl and lauryl) were synthesized via reversible addition–fragmentation chain transfer polymerization in dimethylsulfoxide. It is demonstrated that reactivity of alkyl acrylate in copolymerization decreases with increase of the length of the alkyl substituent. The molar fractions of homodiads and homotriads of acrylonitrile and the number‐average sequence length of acrylonitrile units decreases with a decrease in the acrylate content in the copolymer or with an increase in the length of the alkyl substituent in the acrylate. The copolymer composition was held constant throughout copolymerization in all the studied systems resulting in the formation of copolymers with high compositional homogeneity. Additionally the reversible addition–fragmentation chain transfer mechanism provides low dispersity of the copolymers. Both factors enable the effect of the alkyl substituent in alkyl acrylate on the thermal behavior of acrylonitrile copolymers to be carefully revealed. Being inert in the cyclization reaction, alkyl acrylates have no effect on the activation energy of the reaction. However, increase of the length of the alkyl substituent is followed by a slower evolution of the ladder structure. In contrast, in conditions of oxidative stabilization, the stabilization index increases in the order of increase of the number‐average sequence length of the acrylonitrile units in the copolymers. Thus, the use of alkyl acrylates with longer alkyl substituents provides an increase of chain flexibility and the formation of an enhanced ladder structure during oxidative stabilization which is profitable for carbon fiber production. © 2021 Society of Industrial Chemistry.

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“…PAN precursor modification aims at the introduction of co-monomers, such as methyl acrylate, methyl methacrylate, acrylamide, ethyl acrylate, etc., up to 30 wt.% to the polymer chain [4]. The presence of co-monomers disrupts the regularity of PAN chain, changes the rheology of its solutions, also affecting the onset temperature of cyclization and oxidation [5].…”

Section: Introductionmentioning

confidence: 99%

Anionic Copolymerization of Acrylonitrile with Ethyl Acrylate under the Action of the Initiating System of 1,4-Diazabicyclo[2.2.2]Octane – Ethylene Oxide

Podvalnaya

Tarasov

Grishchuk

et al. 2021

KEM

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It was found, studying acrylonitrile copolymerization with ethyl acrylate in dimethyl sulfoxide under the action of anionic initiating system of 1,4-diazabicyclo [2.2.2] octane – ethylene oxide, that the obtained copolymers have a branched structure. An increase in the molar fraction of ethyl acrylate in the reaction medium leads to a decrease in the initial rate of acrylonitrile polymerization. Thermal behavior of copolymer samples was investigated; it was found that ethyl acrylate, being introduced into the polyacrylonitrile structure, both reduces thermal effects related to the reactions taking place during heat treatment of copolymers, and increases the half-width of the heat release peak.

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Specific features of the copolymerization of acrylonitrile and acrylamide in the presence of low-molecular-mass and polymeric trithiocarbonates and properties of the obtained copolymers

Cited by 17 publications

References 25 publications

Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

Viscosity of polyacrylonitrile solutions: The effect of the molecular weight

Reversible addition–fragmentation chain transferbased copolymers of acrylonitrile and alkyl acrylates as possible precursors for carbon fibers: synthesis and thermal behavior during stabilization

Anionic Copolymerization of Acrylonitrile with Ethyl Acrylate under the Action of the Initiating System of 1,4-Diazabicyclo[2.2.2]Octane – Ethylene Oxide

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