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Preparation of polyurethane nanocapsules by miniemulsion polyaddition

Preparation of polyurethane nanocapsules by miniemulsion polyaddition

Kategori
Vitenskapelig artikkel
Sammendrag
The encapsulation of organic liquids in polyurethane nanocapsules by interfacial miniemulsion polycondensation of isophorone diisocyanate and propanetriol has been performed. The influence of type and amount of encapsulated organic liquid has been studied and it was found that the encapsulation efficiency is dependent on the water solubility of the organic liquids, their interfacial tension against water and their compatibility with polyurethane. It was also shown how different types of surfactants and variations in pH and ionic strength of the continuous phase affected the stability during polymerization and the diameter of the miniemulsion droplets and the resulting nanocapsules. The long-chained anionic surfactant Disponil FES77 can be utilized over a larger pH range than SDS due to the contribution of steric stabilization. Relatively narrow size distributions were obtained.
Språk
Engelsk
Institusjon(er)
  • SINTEF Industri / Bioteknologi og nanomedisin
År
Publisert i
Journal of Microencapsulation
ISSN
0265-2048
Forlag
Taylor & Francis
Årgang
24
Hefte nr.
8
Side(r)
731 - 742