High Internal Phase Emulsions Prepared with Poly(urethane urea) Aqueous Nanodispersion at Different Temperatures

The high internal phase emulsions (HIPE) prepared with poly(urethane urea) aqueous nanodispersion at different temperatures was reported. The difunctional poly(neopentylene adipate) polyol (P756), dimethylpropionic acid (DMPA), N-methyl-pyrrolidone (NMP), and isophorone diisocyanate (IPDI) were charged into a 250-mL four-necked flask equipped with a mechanical stirrer, a nitrogen inlet, a condenser, and a thermometer. The mixture was reacted at 85 °C for 4 h until the theoretical NCO value (3.9 wt %) was reached, which was tested with a standard dibutylamine back titration method according to ASTM D 2572-87. The mixed monomers of Styrene and divinylbenzene (DVB) as organic phase were added to a 100-mL beaker. The beaker was heated with a given temperature water bath and the organic phase was stirred with a magnetic stirrer at 500 rpm. The results showed that the HIPE stabilized by poly(urethane urea) (PUU) particles are temperature dependent.