Author/Authors :
Xu، نويسنده , , Limei and Zhang، نويسنده , , Xiaokai and Yang، نويسنده , , Hui and Li، نويسنده , , Xue and Li، نويسنده , , Chunsheng and Zhang، نويسنده , , Shuxiang، نويسنده ,
Abstract :
A novel route for a preparation of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) block copolymer vesicles induced by supercritical carbon dioxide (scCO2) is demonstrated. When PS-b-PEO block copolymer solutions in tetrahydrofuran (THF) are treated with scCO2 at 70 °C for different times, PS-b-PEO copolymers first assemble into aggregated spheres; then aggregated spheres change into large compound micelles and finally evolve into vesicles. The possible formation mechanism of the vesicles is discussed.
