Synthesis of core-shell polyurethane-polydimethylsiloxane particles by polyaddition in organic dispersant media: Mechanism of particle formation

Abstract : Core-shell polyurethane (PUR)-polydimethylsiloxane (PDMS) particles were prepared by polyaddition between ethylene glycol and tolylene-2,4-diisocyanate in cyclohexane, used as the organic dispersant phase, in the presence of reactive hydroxy-terminated polydimethylsiloxane steric stabilizers. The reaction extent and the PUR particle size, monitored by FTIR, H-1 NMR, SEC, SEM and TEM techniques against time, were found a function of the PDMS concentration, functionality and molar mass. A mechanism of the polyurethane particle growth is proposed on the grounds of the kinetic investigation.
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Submitted on : Tuesday, June 9, 2009 - 6:25:05 PM
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Pierre Chambon, Eric Cloutet, Henri Cramail. Synthesis of core-shell polyurethane-polydimethylsiloxane particles by polyaddition in organic dispersant media: Mechanism of particle formation. Macromolecular Symposia, Wiley-VCH Verlag, 2005, 226, pp.227-238. ⟨10.1002/masy.200550821⟩. ⟨hal-00393818⟩

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