Thermoresponsive Reversible Unimer Micelles of Amphiphilic Fluorinated Copolymers

Elisa Guazzelli, Elena Masotti, Manfred Kriechbaum, Frank Uhlig, Giancarlo Galli, Elisa Martinelli*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Amphiphilic fluorinated copolymers PEGMAx-co-FAy and TEGMAx-co-FAy are prepared by activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP). All polymers present a reversible thermoresponsive lower critical solution temperature-type behavior, and a cloud point temperature (T c) in the range of 30–60 °C strictly dependent on the length of the oxyethylene side chain, the content of the hydrophobic counits, and the concentration of the solution. Combined small angle X-ray scattering (SAXS) and dynamic light scattering measurements are used to study the self-assembly behavior in water, organic solvents (tetrahydrofuran [THF] and dimethylformamide [DMF]), and a fluorinated solvent (hexafluorobenzene [HFB]). SAXS confirms the formation of compact-globular single-chain self-folded unimer micelles in water below T c, which generally presents small hydrodynamic diameters (D h ≤ 8 nm) as a result of the folding of the hydrophobic perfluorohexylethyl acrylate counits. The copolymers are also able to form reverse unimer micelle in HFB. The copolymers are not able to self-assemble in unimer micelles in THF or DMF solutions, in which they adopt conventional random coil conformations.

Originalspracheenglisch
FachzeitschriftMacromolecular Chemistry and Physics
Frühes Online-Datum4 Dez. 2022
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 4 Dez. 2022

ASJC Scopus subject areas

  • Physik der kondensierten Materie
  • Werkstoffchemie
  • Polymere und Kunststoffe
  • Physikalische und Theoretische Chemie
  • Organische Chemie

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