Polyurea nanocapsules obtained from nano-emulsions prepared by the phase inversion temperature method

Liat Spernath, Shlomo Magdassi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We describe here a new and simple method for preparation of polyurea nanocapsules from nanodroplets that were obtained by the phase inversion temperature (PIT) method. In the first stage, a nano-emulsion was prepared, by a heating-cooling cycle, in which the oil phase contained an oil soluble monomer (toluene 2,4-diisocyanate (TDI)). In the second stage, a water-soluble monomer and crosslinker (diethylenetriamine (DETA)) was added, leading to formation of a polymeric shell by an interfacial polycondensation reaction. The new method was demonstrated for obtaining nanocapsules of about 100nm, in which hexadecane, dodecane, or decane were the core materials, without using any special equipment. The morphology and structure of the nanocapsules were evaluated by attenuated total reflection Fourier transform infrared (ATR-FTIR) measurements and electron microscopy. The thermal behavior of the nanocapsules containing hexadecane was studied by Differential Scanning Calorimetry (DSC) measurements, indicating that such nanocapsules can be utilized in thermal energy storage.

Original languageAmerican English
Pages (from-to)2469-2473
Number of pages5
JournalPolymers for Advanced Technologies
Volume22
Issue number12
DOIs
StatePublished - Dec 2011

Keywords

  • Interfacial polymerization
  • Nano-emulsions
  • Nanocapsules
  • PIT

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