Polymer Core-Polymer Shell Particle Formation Enabled by Ultralow Interfacial Tension Via Internal Phase Separation: Morphology Prediction Using the Van Oss Formalism
Journal article, 2018

The internal phase separation technique is a versatile method for liquid core-polymer shell formation, yet limited to very hydrophobic core materials and actives. The use of polymeric cores instead circumvents this restriction due to the absent mixing entropy for binary polymer mixtures which allows the polymeric core (and the active) to approach the polarity of the shell. Polystyrene core-shell and janus particles were formulated using polymethylmethacrylate, poly(lactic acid), poly(lactic acid-co-glycolic acid), poly(ε-caprolactone) or cellulose triacetate as shell-forming polymers. The morphology and the partitioning was experimentally determined by selectively staining the core and the shell with β-carotene and methylene blue respectively. In addition, the van Oss formalism was introduced to theoretically predict the thermodynamic equilibrium morphology. As elucidated using the theoretical predictions as well as experimental optical tensiometry, it was found that the driving force for core-shell morphology is, in contrast to liquid core-polymer shell particles, a low core-shell interfacial tension.

Janus

Core-shell

Solvent evaporation

Raspberry

Spreading

Microcapsule

Author

Markus Andersson Trojer

Swerea IVF AB

Max Planck Institute

Anna Ananievskaia

University of Gothenburg

Asvad A. Gabul-Zada

University of Gothenburg

Lars Nordstierna

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Lars Nordstierna Group

Hans Blanck

University of Gothenburg

Colloids and Interface Science Communications

2215-0382 (eISSN)

Vol. 25 36-40

Smart frisättning från antimikrobiell cellulosatextil för hållbar sårvård av svårläkta kroniska sår

VINNOVA, 2018-01-08 -- 2019-12-20.

Subject Categories

Polymer Chemistry

Physical Chemistry

Other Chemistry Topics

DOI

10.1016/j.colcom.2018.07.001

More information

Latest update

9/19/2018