Single-chain folding and self-assembling of amphiphilic polyethyleneglycol-modified fluorinated styrene homopolymers in water solution

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Amphiphilic tetrafluorostyrene monomers (EFSn) carrying in the para position a polyethyleneglycol (PEG) chain with varied lengths (n = 3–13) were synthesized and polymerized by ARGET-ATRP to obtain the corresponding amphiphilic homopolymers pEFSn-x with controlled and tailored polymerization degrees (x = 8–135). All polymers presented a reversible thermoresponsive LCST-type behavior, in water/methanol mixture when n ≤ 4 or in pure water when n ≥ 8, with a cloud point (C p) temperature in the range 30–40 °C strictly dependent on the length of the PEG side chain. Combined small angle X-scattering (SAXS) and dynamic light scattering (DLS) measurements were used to study the self-assembly behavior in water of the water-soluble amphiphilic homopolymers. SAXS confirmed the formation of compact-sized and spherical single-chain self-folded nanostructures below C p, that generally presented small hydrodynamic diameters (D h ≤ 11 nm) as proven by DLS analysis. Above C p, much larger multi-chain aggregates were formed (D h ≥ 800 nm), that reversibly turned back to collapsed nanostructures on cooling below the C p temperature. By contrast, the polymers were not able to self-assemble in THF or DMF solutions, in which they adopted conventional random coil conformations.

Original languageEnglish
Article number124107
JournalPolymer
Volume231
DOIs
Publication statusPublished - 28 Sep 2021

Keywords

  • Amphiphilic polymer
  • LCST
  • SAXS
  • Single-chain nanoparticles
  • Thermoresponsive polymer

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Organic Chemistry

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