PREPARATION AND PROPERTIES OF POLYUREA MICROCAPSULES WITH NONIONIC SURFACTANT AS EMULSIFIER

Polyurea microcapsules containing oily substances were prepared by usi ng cyanate and polyamine as the monomers with non-ionic surfactant as the emulsifiers. Results showed that TDI-DETA microcapsules had the be st stability. The mean diameter decreased and the size distribution cu rves became narrower and sharper as the stirring speed and the emulsif ier concentration during emulsification increased. Addition of Tween 8 0 to aqueous solution containing OP led to an increase in microcapsule diameter and wider distribution of microcapsules due to the changes i n interfacial tension. The isoelectric point of the polyurea microcaps ules was found to be pH 5.8.