Controlled synthesis of acrylic homo- and copolymers in the presence of trithiocarbonates as reversible addition-fragmentation chain transfer agents

Черникова, Е. В.; Terpugova, P. S.; Trifilov, M. Yu.; Garina, E. S.; Голубев, В. Б.; Sivtsov, E. V.

doi:10.1134/s0965545x09060108

Cited by 28 publications

(17 citation statements)

References 7 publications

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“…PTBA was obtained via pseudoliving radical bulk polymerization of tert butyl acrylate at 80°C with the use of dibenzyltrithio carbonate (10 -1 mol/L) as the reversible chain transfer agent and AIBN (10 -3 mol/L) as the initiator as described previously [22,23]. The molecular mass characteristics of PTBA were determined in THF at 35°С via GPC on a Waters liquid chromatograph (UV and refractometric detectors, three columns filled with Ultrastyragel with pore sizes of 10 3 and 10 5 Å, and a linear column).…”

Section: Methodsmentioning

confidence: 99%

“…The comple tion of hydrolysis was determined via 1 H NMR spec troscopy on a Bruker DRX spectrometer (400 MHz, 20°C, CDCl 3 for PTBA and (CD 3 ) 2 SO for PAA*). According to the synthesis conditions [22][23][24], each PAA* macromolecule contained a trithiocarbonate fragment. Thus, the concentrations of aqueous solu tions of PA Na* were determined via spectropho tometry from the absorption maximum due to the thiocarbonyl group [25,26], in the UV region at λ = 305 nm (ε = 115 L/(mol cm)).…”

Section: Methodsmentioning

confidence: 99%

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Competitive interactions in hydrogel-interpolyelectrolyte complex systems

et al. 2015

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Substitution reactions between weakly crosslinked anionic hydrogels (network sodium polyacry late or network sodium poly(2 acrylamido 2 methyl 1 propanesulfonate)) and nonstoichiometric inter polyelectrolyte complexes formed by a blocking linear sodium polyacrylate and lyophilizing poly(N,N' dial lyl N,N' dimethylammonium chloride) in aqueous media have been revealed and studied. It has been found that both sulfonate and carboxylate networks take up a linear polycation via the formation of a stoichiometric interpolyelectrolyte complex, a phenomenon that results in the collapse of the network. In this case, the blocking polyacrylate anions are quantitatively expelled from the particles of the nonstoichiometric water soluble complex into the environment and occupy lyophilizing polycations uniformly, a circumstance that results in their precipitation and, consequently, the termination of the substitution reaction. This outcome suggests the presence of feedback in the studied processes. The result for carboxylate networks is completely new and nontrivial; it is indicative of the important role of macromolecular architecture in selecting the direc tion of a process.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Competitive interactions in hydrogel-interpolyelectrolyte complex systems

et al. 2015

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“…Benzyl dithiobenzoate (BB) and dibenzyl trithiocarbonate (BC) were chosen as RAFT agents. These com pounds were shown to be effective for the controlled synthesis of various polymers [4,12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlled radical copolymerization of styrene with acrylic acid and tert-butyl acrylate under conditions of reversible addition-fragmentation chain transfer: Control of the chain microstructure

et al. 2015

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The copolymerization of styrene and acrylic acid and the copolymerization of styrene and tert butyl acrylate that are mediated by benzyl dithiobenzoate and dibenzyl trithiocarbonate as reversible addi tion fragmentation chain transfer agents are studied for the first time. It is shown that the copolymerization of these monomer pairs mediated by reversible addition fragmentation chain transfer agents occurs via the pseudoliving radical mechanism and is characterized by a linear increase in the number average molecular weight with an increase in the total conversion of the monomers and by the formation of narrowly dispersed copolymers. Variation in the conditions of the radical copolymerization of styrene and acrylic acid (in the type of reversible addition fragmentation chain transfer agent and the addition of a polar solvent) and of the radical copolymerization of styrene and tert butyl acrylate (in the composition of the monomer mixture) makes it possible to control the chain microstructures of the copolymers.

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“…The ini tiator, AIBN, was recrystallized from methanol and dried in vacuum to a constant weight. Dibenzyl trithiocarbonate (BTC) and cyanoisopropyl dithiobenzoate (CIB) were synthesized in accordance with the known techniques and characterized by NMR spectroscopy, as described in [24][25][26][27]. In addi tion, polymeric RAFT agents, such as poly(styrene dithiobenzoate) (PSB), poly(styrene trithiocarbon ate) (PSC), and poly(tert butyl acrylate) trithiocar bonate (PTBAC), were used.…”

Section: Introductionmentioning

confidence: 99%

Controlled synthesis of multiblock copolymers by pseudoliving radical polymerization via the reversible addition-fragmentation chain-transfer mechanism

et al. 2012

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With the use of two classes of reversible addition fragmentation chain transfer agentsdithiobenzoates and trithiocarbonates-multiblock copolymers based on styrene and n butyl acrylate, which are the best studied monomers in these processes, are synthesized. It is shown that the polymers containing dithiobenzoate and trithiocarbonate groups are highly efficient for the synthesis of block copolymers, which is independent of the number of stages at which the polymeric RAFT agents are used in polymerization: In all cases, the polymeric RAFT agent is fully consumed in the polymerization of the "alien" monomer. The mechanism governing chain formation during the synthesis of multiblock copolymers, that is, the character of monomer insertion into the polymer chain, via one or both ends, is studied. It is found that the order of monomer loading determines the ratio of chains growing through one or two ends. The thermal stability of amphiphilic multiblock copolymers, their solubility in various solvents, and self organizing ability are inves tigated.

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Controlled synthesis of acrylic homo- and copolymers in the presence of trithiocarbonates as reversible addition-fragmentation chain transfer agents

Cited by 28 publications

References 7 publications

Competitive interactions in hydrogel-interpolyelectrolyte complex systems

Competitive interactions in hydrogel-interpolyelectrolyte complex systems

Controlled radical copolymerization of styrene with acrylic acid and tert-butyl acrylate under conditions of reversible addition-fragmentation chain transfer: Control of the chain microstructure

Controlled synthesis of multiblock copolymers by pseudoliving radical polymerization via the reversible addition-fragmentation chain-transfer mechanism

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