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Colloid and Polymer Science

, Volume 297, Issue 11–12, pp 1445–1454 | Cite as

Molecular brushes with poly-2-ethyl-2-oxazoline side chains and aromatic polyester backbone manifesting double stimuli responsiveness

  • Alexander Filippov
  • Elena TarabukinaEmail author
  • Alisa Kudryavtseva
  • Emil Fatullaev
  • Mikhail Kurlykin
  • Andrey Tenkovtsev
Original Contribution
  • 134 Downloads

Abstract

Behavior of grafted copolymers composed of aromatic polyester (PAPE) backbone and poly-2-ethyl-2-oxazoline (PEOZ) side chains differing in grafting density in aqueous solutions was studied when heated at various concentrations and pH using static and dynamic light scattering and turbidimetry. Aggregates and individual macromolecules were registered in solutions at all times. It was shown that the aggregates of the brush with higher PEOZ side chains’ grafting density undergo compaction on heating below phase separation, whereas the size of the loose polymer brush aggregates continuously increases with the increase of temperature. Phase separation temperatures of both copolymers decreased with dilution. Strong influence of pH on the thermosensitivity of both samples was shown, the copolymer solubility being decreased with the acidity decrease. The nature of the pH effect is under discussion.

Graphical abstract

Keywords

Poly-2-ethyl-2-oxazoline Grafted polymers Thermoresponsive polymer brushes pH sensitivity Static light scattering Dynamic light scattering 

Notes

Funding information

The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of Research Project No. 18-03-00356_a.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

396_2019_4558_Fig12_ESM.png (15 kb)
Fig. SI1

Dependence of Ss/Sf on pH for PAPE-g-PEOZ solutions at c = 0.0015 g/cm3. (PNG 14 kb)

396_2019_4558_MOESM1_ESM.eps (39 kb)
High resolution image (EPS 39 kb)
396_2019_4558_Fig13_ESM.png (13 kb)
Fig. SI2

The values of RslowT/Rsmin at different c for sample 2. (PNG 12 kb)

396_2019_4558_MOESM2_ESM.eps (46 kb)
High resolution image (EPS 46 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Alexander Filippov
    • 1
  • Elena Tarabukina
    • 1
    Email author
  • Alisa Kudryavtseva
    • 1
  • Emil Fatullaev
    • 2
  • Mikhail Kurlykin
    • 1
  • Andrey Tenkovtsev
    • 1
  1. 1.Institute of Macromolecular CompoundsRussian Academy of SciencesSaint PetersburgRussia
  2. 2.Saint Petersburg National Research University of Information Technologies, Mechanics and OpticSaint PetersburgRussia

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