Dependence of copolymer composition upon molecular weight in homogeneous radical copolymerization

Semchikov, Yu. D.; Смирнова, Л. А.; Knyazeva, T.Ye.; Bulgakova, S. A.; Sherstyanykh, V.I.

doi:10.1016/0014-3057(90)90162-w

Cited by 37 publications

(23 citation statements)

References 11 publications

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“…Changes in the copolymer composition and in r 1 and r 2 values as influenced by AIBN content were also found by Begantseva et al [20] who studied the copolymerization of styrene and acrylamide in DMSO. This suggests that a significant difference in the concentration of initiators (nearly two orders of magnitude) in the system studied provides formation of copolymers with different M, which, in accordance with [21,22], affects the selective solvation of macroradicals with monomers and changes the composition of the resulting copolymers.…”

supporting

confidence: 56%

Copolymerization of Sodium 2-Acrylamido-2-methylpropane-1-sulfonate with N-Vinylpyrrolidone in Aqueous Dimethylformamide Solutions

et al. 2005

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The kinetics of radical copolymerization of sodium 2-acrylamido-2-methylpropane-1-sulfonate with N-vinylpyrrolidone in water, water3dimethylformamide (1 : 1) solutions, and dimethylformamide at pH 9 and 60oC in the presence of initiators [azobis(isobutyronitrile) and ammonium persulfate] was studied by dilatometry.The reaction medium strongly affects both the kinetic parameters of copolymerization of salts of 2-acrylamido-2-methylpropane-1-sulfonic acid (H-AMS) with N-vinylpyrrolidone (VP) and the properties of the resulting copolymers. This is due to the features in the behavior of ionic monomers [1, 2] and nonionic VP monomer [3,4] in the processes of radical (co)polymerization. Previously we studied copolymerization of sodium 2-acrylamido-2-methylpropane-1-sulfonate (Na-AMS) with VP in aqueous [537] and dimethyl sulfoxide [8] solutions and examined how the ionic strength of the solution and kind of mono-[9, 10] and bivalent [10,11] cations affect the copolymerization in aqueous solutions.

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confidence: 56%

Copolymerization of Sodium 2-Acrylamido-2-methylpropane-1-sulfonate with N-Vinylpyrrolidone in Aqueous Dimethylformamide Solutions

et al. 2005

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“…For these changes in the Flory parameters, the concentration of the first reagent in the globule remains virtually unchanged, being about 2.5 times higher than its external concentration. This is also favored by the values of parameters 13 LL and 11 LP of the first reagent interaction with the solvent and polymer as well as small value of parameter 12 LL , which does not prevent the increase in concentrations of both reagents in the globule.…”

Section: Resultsmentioning

confidence: 89%

“…[8][9][10][11][12][13][14][15][16][17][18][19][20] Its quantitative theory has been developed, 21,22 taking into account the sorption of monomers into the growing macroradical being in the globular conformation state. The basis for this theory is thermodynamic relations connecting the concentrations of low-molecular-weight reagents inside and outside a globule.…”

Section: Introductionmentioning

confidence: 99%

Polymer Globule as a Nanoreactor

et al. 2008

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Peculiarities of chemical reactions inside polymer globules with sizes falling in the nanometric range have been theoretically studied. The simplest example of a polymer-catalyzed bimolecular reaction between two low-molecular-weight compounds has been considered to illustrate the advantages of conducting chemical transformations in globular solution of macromolecules. Under theoretical examination of polymer-analogous transformations of polymer molecules, the possibility has been shown of reaction-induced conformational transitions between their coil and globular states. Besides, a pronounced effect has been revealed of the preferential sorption of low-molecular-weight reagents on composition of copolymers formed.

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“…However, upon an increase in the polymer chain length the AA monomers start to form hydrogen bonds and adsorb on the growing chain, that leads to an increase in local concentration of AA monomer near the active centre. Therefore, the longer the chain, the stronger the boot strap effect [18,25]. As a result, the more active monomers of S polymerize faster and the growing chains are enriched in S in the beginning of the reaction, whereas upon an increase in the molecular mass of the copolymers the rate of poly merization of AA monomers will increase and, conse quently, the ends of the chains are enriched in AA.…”

Section: Determination Of the Reactivity Ratios Of Styrene And Acrylimentioning

confidence: 99%

Synthesis of amphiphilic block-gradient copolymers of styrene and acrylic acid by Nitroxide Mediated Polymerization

et al. 2015

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We present an overview on synthesis of amphiphilic ionic block gradient copolymers of styrene and acrylic acid by means of one step direct Nitroxide Mediated Polymerization (NMP) and their characterization. The copolymers comprise a block of poly(acrylic acid) and one or two terminal blocks that include co monomer units of styrene and acrylic acid in variable proportion. Using 1 H NMR the gradient sequence of the poly(acrylic acid co styrene) copolymer block has been confirmed. In contrast to diblock copolymers of styrene and acrylic acid, that are known to form in aqueous environment "frozen" aggregates with glassy poly(styrene) core, the novel block gradient copolymers exhibit stimuli responsive aggregation behavior, as was demonstrated by subse quent studies. This feature makes them very promising for design of a large variety of smart functional materials.

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Dependence of copolymer composition upon molecular weight in homogeneous radical copolymerization

Cited by 37 publications

References 11 publications

Copolymerization of Sodium 2-Acrylamido-2-methylpropane-1-sulfonate with N-Vinylpyrrolidone in Aqueous Dimethylformamide Solutions

Copolymerization of Sodium 2-Acrylamido-2-methylpropane-1-sulfonate with N-Vinylpyrrolidone in Aqueous Dimethylformamide Solutions

Polymer Globule as a Nanoreactor

Synthesis of amphiphilic block-gradient copolymers of styrene and acrylic acid by Nitroxide Mediated Polymerization

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