Synthesis of hydrophilic polyurethane particles in non-aqueous inverse miniemulsions


It is shown that it is possible to synthesize high molecular weight hydrophilic polyurethane particles by reacting either tolylene-2,4-diisocyanate or isophorone diisocyanate and oligoethylene glycol (M n ∼200 g mol−1) in non-aqueous inverse emulsions. This procedure offers the advantage that the formation of polyurea can be prevented in consequence of the absence of water in the emulsion. Apparent molecular weights of hydrophilic polyurethane as high as 19,000 g mol−1 (M n) were obtained.

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We gratefully acknowledge Petra Räder, Gunnar Glaser and Katrin Kirchhoff, and Christine Rosenauer, Ute Heinz, and Sandra Seywald for the DSC, electron microscopy, and GPC measurements, respectively. We would like also to thank Dr. Anja Kröger-Brinkmann for interesting discussions and Dr. Eyk Schreiber for testing the isocyanate titration.

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Correspondence to Daniel Crespy.

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Herrmann, C., Crespy, D. & Landfester, K. Synthesis of hydrophilic polyurethane particles in non-aqueous inverse miniemulsions. Colloid Polym Sci 289, 1111–1117 (2011).

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  • Miniemulsion
  • Nanoparticle
  • Non-aqueous emulsion
  • Polyaddition
  • Polyurethane