Effects of concentration and pH on the thermosensitive behavior of a graft copolymer with polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains

A. S. Ivanova, N. V. Zakharova, A. P. Filippov, T. K. Meleshko, A. V. Yakimansky

Research output

10 Citations (Scopus)

Abstract

Aqueous solutions of the graft copolymer with a polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains with a molecular mass of M = 4.7 × 105 and a grafting density of side chains of 0.44 are investigated by light scattering and turbidimetry. Solutions are studied in a wide concentration range of 0.0008–0.0250 g/cm3 at рН values varying from 2 to 12 for each concentration. The temperature dependences of optical transmission, scattered light intensity, and hydrodynamic radii of scattering objects are obtained. It is shown that the copolymer is thermosensitive only at pH > 8.0. A decrease in acidity of the medium at a fixed concentration of the copolymer is accompanied by a decline in temperatures corresponding to the onset and end of phase separation Т1 and Т2, leading to the narrowing of this interval. At constant рН values, temperatures Т1 and Т2 rise with solution dilution, while the phase transition interval becomes wider.

Original languageEnglish
Pages (from-to)281-287
Number of pages7
JournalPolymer Science - Series A
Volume59
Issue number3
DOIs
Publication statusPublished - 1 May 2017

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Graft copolymers
Polyimides
Copolymers
Molecular mass
Light transmission
Acidity
Phase separation
Light scattering
Temperature
Dilution
Hydrodynamics
Phase transitions
Scattering
2-(dimethylamino)ethyl methacrylate

Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Effects of concentration and pH on the thermosensitive behavior of a graft copolymer with polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains",
abstract = "Aqueous solutions of the graft copolymer with a polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains with a molecular mass of M = 4.7 × 105 and a grafting density of side chains of 0.44 are investigated by light scattering and turbidimetry. Solutions are studied in a wide concentration range of 0.0008–0.0250 g/cm3 at рН values varying from 2 to 12 for each concentration. The temperature dependences of optical transmission, scattered light intensity, and hydrodynamic radii of scattering objects are obtained. It is shown that the copolymer is thermosensitive only at pH > 8.0. A decrease in acidity of the medium at a fixed concentration of the copolymer is accompanied by a decline in temperatures corresponding to the onset and end of phase separation Т1 and Т2, leading to the narrowing of this interval. At constant рН values, temperatures Т1 and Т2 rise with solution dilution, while the phase transition interval becomes wider.",
author = "Ivanova, {A. S.} and Zakharova, {N. V.} and Filippov, {A. P.} and Meleshko, {T. K.} and Yakimansky, {A. V.}",
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TY - JOUR

T1 - Effects of concentration and pH on the thermosensitive behavior of a graft copolymer with polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains

AU - Ivanova, A. S.

AU - Zakharova, N. V.

AU - Filippov, A. P.

AU - Meleshko, T. K.

AU - Yakimansky, A. V.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Aqueous solutions of the graft copolymer with a polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains with a molecular mass of M = 4.7 × 105 and a grafting density of side chains of 0.44 are investigated by light scattering and turbidimetry. Solutions are studied in a wide concentration range of 0.0008–0.0250 g/cm3 at рН values varying from 2 to 12 for each concentration. The temperature dependences of optical transmission, scattered light intensity, and hydrodynamic radii of scattering objects are obtained. It is shown that the copolymer is thermosensitive only at pH > 8.0. A decrease in acidity of the medium at a fixed concentration of the copolymer is accompanied by a decline in temperatures corresponding to the onset and end of phase separation Т1 and Т2, leading to the narrowing of this interval. At constant рН values, temperatures Т1 and Т2 rise with solution dilution, while the phase transition interval becomes wider.

AB - Aqueous solutions of the graft copolymer with a polyimide backbone and poly(N,N-dimethylamino-2-ethyl methacrylate) side chains with a molecular mass of M = 4.7 × 105 and a grafting density of side chains of 0.44 are investigated by light scattering and turbidimetry. Solutions are studied in a wide concentration range of 0.0008–0.0250 g/cm3 at рН values varying from 2 to 12 for each concentration. The temperature dependences of optical transmission, scattered light intensity, and hydrodynamic radii of scattering objects are obtained. It is shown that the copolymer is thermosensitive only at pH > 8.0. A decrease in acidity of the medium at a fixed concentration of the copolymer is accompanied by a decline in temperatures corresponding to the onset and end of phase separation Т1 and Т2, leading to the narrowing of this interval. At constant рН values, temperatures Т1 and Т2 rise with solution dilution, while the phase transition interval becomes wider.

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DO - 10.1134/S0965545X17030087

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VL - 59

SP - 281

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JO - Polymer Science - Series A

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