Key words: supercritical fluid, antisolvent, phase diagram, rapid expansion, RESS, nanoparticles, polyisobutylene, polystyrene, modification
On the experimental test bench Thar RESS-100-2 Base the dispersion process of
polyisobutylene in the range of temperatures 45 ÷ 120 °C and pressures 100 ÷ 350 bar
was investigated; the particle size was 30 ÷ 1000 nm. The possibility of managing the
particle size by varying of the process parameters was revealed. The new method of
polymer particles modification during the rapid solution expansion was suggested. In
the modification process the effect of agglomeration is suppressed and the particles are
covered by modifier (NaCl). The availability of application of superctitical fluid antisolvent
to the dispersion of polymers to nanoparticles is based. The experimental test
bench for this method is described. Catching method for polymer nanoparticles formed
in antisolvent was suggested. While dispersing polystyrene in the system “tolyene -
polystyrene - supercritical carbon dioxide” under pressure 40 ÷ 150 bar and temperature
doi:10.1134/S1990793109080041