Acid-labile surfactants based on poly(ethyleneglycol), carbon dioxide and propylene oxide: Miniemulsion polymerization and degradation studies

Markus Scharfenberg, Sarah Wald, Frederik R. Wurm, Holger Frey*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
1 Downloads (Pure)

Abstract

Partially degradable, nonionic AB and ABA type di- and triblock copolymers based on poly(propylene carbonate) and poly(ethylene glycol) blocks were synthesized via immortal copolymerization of carbon dioxide and propylene oxide, using mPEG or PEG as a macroinitiator, and (R,R)-(salcy)-CoOBzF5 as a catalyst in a solvent-free one-pot procedure. The amphiphilic surfactants were prepared with molecular weights (Mn) between 2800 and 10,000 g mol-1 with narrow molecular weight distributions (1.03-1.09). The copolymers were characterized using 1H-, 13C- and DOSY-NMR spectroscopy and size exclusion chromatography (SEC). Surface-active properties were determined by surface tension measurements (critical micelle concentration, CMC; CMC range: 1-14 mg mL-1). Degradation of the acid-labile polycarbonate blocks was investigated in aqueous solution using online 1H-NMR spectroscopy and SEC. The amphiphilic polymers were used as surfactants in a direct miniemulsion polymerization for poly(styrene) (PS) nanoparticles with mean diameter of 270 to 940 nm. The usage of an acid-triggered precipitation of the emulsion simplified the separation of the particles from the surfactant and purification of the nanoparticles.

Original languageEnglish
Article number422
JournalPolymers
Volume9
Issue number9
DOIs
Publication statusPublished - 6 Sep 2017
Externally publishedYes

Keywords

  • CO
  • Degradation
  • Miniemulsion polymerization
  • Nanoparticle
  • Polycarbonate
  • Surfactant

Fingerprint Dive into the research topics of 'Acid-labile surfactants based on poly(ethyleneglycol), carbon dioxide and propylene oxide: Miniemulsion polymerization and degradation studies'. Together they form a unique fingerprint.

Cite this