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Polymer Core-Polymer Shell Particle Formation Enabled by Ultralow Interfacial Tension Via Internal Phase Separation: Morphology Prediction Using the Van Oss Formalism
RISE - Research Institutes of Sweden, Materials and Production, IVF. Max Planck Institute of Colloids and Interfaces, Germany.ORCID iD: 0000-0002-7939-4684
University of Gothenburg, Sweden.
University of Gothenburg, Sweden.
Chalmers University of Technology, Sweden.
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2018 (English)In: Colloid and Interface Science Communications, ISSN 2215-0382, Vol. 25, p. 36-40Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 25, p. 36-40
Keywords [en]
Microcapsule, Solvent evaporation, Core-shell, Raspberry, Janus, Spreading
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:ri:diva-34236DOI: 10.1016/j.colcom.2018.07.001Scopus ID: 2-s2.0-85049475130OAI: oai:DiVA.org:ri-34236DiVA, id: diva2:1233450
Available from: 2018-07-18 Created: 2018-07-18 Last updated: 2019-06-18Bibliographically approved

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Andersson Trojer, Markus

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