Engineering thermoresponsive emulsions with branched copolymer surfactants

Michael T. Cook, Abhishek Rajbanshi, Daniel Achampong, Cécile A. Dreiss, Marcelo Alves da Silva, Lionel Porcar, Najet Mahmoudi, Armando Maestro, Andrea Tummino, Philipp Gutfreund

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This study describes thermo‐rheological properties of branched copolymer surfactants (BCSs) stabilizing oil‐in‐water emulsions to generate materials exhibiting temperature‐dependent gelation with the ability to solubilize a broad range of molecules. Four poly(N‐isopropylacrylamide‐ran‐poly(ethylene glycol) methacrylate) (poly(NIPAM‐ran‐PEGMA)) BCSs with varying molecular weight (Mn), 4.7; 7.0; 7.8 and 9.0 kg mol−1, are investigated via oscillatory shear rheology, small angle neutron scattering (SANS), and neutron reflectivity (NR). Rheological thermoscans show that emulsions stabilized by the BCS with the lowest Mn (4.7 kg mol−1) are thermo‐thinning, while with the other BCSs the emulsions display a thermo‐thickening behavior. Emulsions stabilized with the BCS with Mn = 7.8 kg mol−1 form gels within a precise temperature window depending on BCS concentration. Small angle neutron scattering data analysis suggests that the BCS is present in two forms in equilibrium, small aggregates dispersed in the bulk water and an adsorbed polymeric layer at the oil/water interface. Changes in dimensions of these structures with temperature correlate with the macroscopic thermo‐thinning/thermo‐thickening behavior observed. Neutron reflectivity is conducted at the oil/water interface to allow further elucidation of BCS behavior in these systems.
Original languageEnglish
Article number2200321
Number of pages14
JournalMacromolecular Materials and Engineering
Early online date10 Aug 2022
Publication statusPublished - 21 Aug 2022


  • emulsion engineering
  • thermoreversible gels
  • small angle neutron scattering
  • Research Articles
  • Research Article


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