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Synthesis of Core‐Shell Polyurethane‐Polydimethylsiloxane Particles by Polyaddition in Organic Dispersant Media: Mechanism of Particle Formation
Author(s) -
Chambon Pierre,
Cloutet Eric,
Cramail Henri
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550821
Subject(s) - polyurethane , polydimethylsiloxane , dispersant , materials science , ethylene glycol , polymer chemistry , chemical engineering , particle (ecology) , particle size , cyclohexane , composite material , chemistry , organic chemistry , dispersion (optics) , oceanography , physics , optics , geology , engineering
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, 1 H 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.