Synthesis of multicentered polyimide initiators for the preparation of regular graft copolymers via controlled radical polymerization

Мелешко, Т. К.; Ilgach, D. M.; Богорад, Н. Н.; Kukarkina, N. V.; Vlasova, E. N.; Добродумов, А. В.; Малахова, И. И.; Горшков, Н. И.; Красиков, В. Д.; Yakimanskiĭ, A. V.

doi:10.1134/s1560090410090113

Cited by 31 publications

(19 citation statements)

References 12 publications

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“…[7,8] Thus, it is not surprising that the glass transition temperatures for PI-g-PMMA (Fig. 6, curve 1) were higher than those for PMMA homopolymers obtained by a free-radical polymerization and having, therefore, rather broad molecular weight distributions (Fig.…”

Section: High-temperature Relaxation Rangementioning

confidence: 92%

“…[7,8] Separate investigations were carried out for PMMA side chains cleaved from the PI brushes PI-g-PMMA [8] and for a commercial linear PMMA sample (Aldrich, M w = 350,000).…”

Section: Methodsmentioning

confidence: 99%

“…[8] The main synthetic strategy for the synthesis of these polymer molecular brushes is controlled radical polymerization (CRP) of vinyl monomers by multicenter polyimide macroinitiators (PIMI), making it possible to prepare polymer brushes with a high regularity and a narrow molecular weight distribution of side chains. [6][7][8][9] Investigations of the molecular mobility in polymers reveal the link between their chemical structure and physical properties. In this respect, the dielectric spectroscopy method is rather informative, providing information on the dipolar polarization relaxation processes caused by the molecular mobility of a macromolecule as a whole, backbone segments, bulky side substituents, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Polymer brushes are able to form various ordered nanostructures, and, owing to their special topology and side chains functionality, possess unique properties which are promising for applications in various fields as, e.g., highly active catalysts, sensors, nanoreactors, nanocontainers for targeted drug delivery, nanoporous membranes, etc. [1][2][3] Among a vast amount of synthesized polymer molecular brushes with various natures of the backbone and side chains, [4][5][6][7][8] those with strongly different thermodynamic properties of the backbone and side chains are of an especially great interest since they may form multiple nanostructures in selective solvents and films cast from such solvents. Recently, molecular brushes with rather high-molecular weight polyimide (PI) backbones and polyvinyl side chains were synthesized and possibilities of wide variations of the structure of side chains (including the introduction of functional groups into them), their length, and grafting density were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Mobility of Molecular Brushes With a Polyimide Backbone and Polymethylmethacrylate Side Chains of Different Lengths

Никонорова

Мелешко

Ilgach

et al. 2013

Journal of Macromolecular Science, Part B

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The molecular mobility of polyimide (PI) brushes, i.e., graft-copolymers with a polyimide backbone and PMMA side chains of different lengths, is studied by the dielectric spectroscopy method. Three dipolar polarization regions are found in the temperature range from -150 to 200 • C: β-, β 1 , and α-processes. The β-process is due to a local mobility of polar groups of the PI backbone in the glassy state. Ester groups of polymethylmethacrylate (PMMA) side chains are responsible for two forms of the molecular mobility: a local mobility in the glassy state (β 1 -process) and a cooperative segmental motion of the skeletons of the PMMA side chains (α-process). The parameters of the β-and β 1 -processes are weakly dependent on the side chain's length. For the α-process, the molecular mobility of the PMMA side chains decreases with increasing their length.

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Section: High-temperature Relaxation Rangementioning

confidence: 92%

“…[7,8] Separate investigations were carried out for PMMA side chains cleaved from the PI brushes PI-g-PMMA [8] and for a commercial linear PMMA sample (Aldrich, M w = 350,000).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular Mobility of Molecular Brushes With a Polyimide Backbone and Polymethylmethacrylate Side Chains of Different Lengths

Никонорова

Мелешко

Ilgach

et al. 2013

Journal of Macromolecular Science, Part B

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“…The welldefined synthesis of graft copolymers is an important topic in macromolecular chemistry (23). Macrointermediates such as macroinitiators, macromonomers, and macrocrosslinkers have been extensively used for designing various block or graft copolymers via a radical initiated process (24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(vinyl chloride-graft-2-vinylpyridine) graft copolymers using a novel macroinitiator by reversible addition-fragmentation chain transfer polymerization

et al. 2014

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Synthesis of poly(vinyl chloride-graft-2-vinylpyridine) graft copolymers was carried out by reversible addition-fragmentation chain transfer (RAFT) polymerization of 2-vinylpyridine using a novel macroinitiator (RAFT macroinitiator). For this purpose, RAFT macroinitiator was obtained from the potassium salt of ethyl xanthogenate and poly(vinyl chloride) (PVC). Then the graft copolymers were synthesized by using RAFT macroinitiator and 2-vinylpyridine. The principal parameters such as monomer concentration, initiator concentration, and polymerization time that affect the polymerization reaction were studied. The effect of the reaction conditions on the heterogeneity index and molecular weight was also investigated. The block lengths of the graft copolymers were calculated by using 1 H nuclear magnetic resonance ( 1 H NMR) spectra. The block lengths of the copolymers could be adjusted by varying the monomer and initiator concentrations. The characterizations of the samples were carried out by using 1 H NMR, Fourier-transform infrared spectroscopy, gel-permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, and fractional precipitation (γ value) techniques. RAFT polymerization is used to control the polymerization of 2-vinylpyridine over a broad range of molecular weights.

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Synthesis and Solution Properties of Loose Polymer Brushes Having Polyimide Backbone and Methylmethacrylate Side Chains

Krasova

Belyaeva

Тарабукина

et al. 2012

Macromolecular Symposia

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Summary: Graft‐copolymers with polyimide backbone and PMMA side chains are synthesized by ATRP of methylmethacrylate on the polyimide macroinitiator. The obtained copolymers, macroinitiator, and cleaved side chains are investigated by 1H NMR, SEC, static and dynamic light scattering, sedimentation, and viscosimetry in solutions. The synthesized copolymer is relatively loose polymer brushes: the average distance between grafted PMMA chains is ∼11 nm (4 repeat units of the backbone). The hydrodynamic and conformational characteristics of graft‐copolymers change on passage from ethylacetate to chloroform due to difference in the thermodynamic quality of the solvents with respect to the copolymer components. The backbone is characterized more extended conformation than individual polyimide macromolecule.

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Synthesis of multicentered polyimide initiators for the preparation of regular graft copolymers via controlled radical polymerization

Cited by 31 publications

References 12 publications

Molecular Mobility of Molecular Brushes With a Polyimide Backbone and Polymethylmethacrylate Side Chains of Different Lengths

Molecular Mobility of Molecular Brushes With a Polyimide Backbone and Polymethylmethacrylate Side Chains of Different Lengths

Synthesis and characterization of poly(vinyl chloride-graft-2-vinylpyridine) graft copolymers using a novel macroinitiator by reversible addition-fragmentation chain transfer polymerization

Synthesis and Solution Properties of Loose Polymer Brushes Having Polyimide Backbone and Methylmethacrylate Side Chains

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