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