Preparation of Chitosan-g-PAMPS Micro Particles in H2O/CO2 Inverse Emulsion Using a Three Arm Star-like Side Chain Fluorinated Polymer as the Surfactant

摘要

A novel three arm star-like side chain fluorinated polymers containing quaternary ammonium salts: (PF-PHEMA)3-TAI-Q was synthesized via atom transfer radical polymerization(ATRP). (PF-PHEMA)3-TAI-Q is an amphiphilic polymer which contains hydrophilic quaternary ammonium salts and CO2-philic fluorinated side chains. (PF-PHEMA)3-TAI-Q was then used as surfactant in H2O/CO2 inverse emulsion to prepare chitosan-g-PAMPS(CS-g-PAMPS) graft copolymers. The effects of mass ratio of water and the surfactants and the pressure of scCO2 on the properties of CS-g-PAMPS was investigated in this study, and it can be found that CS-g-PAMPS prepared in this reaction system has higher grafting rate, smaller particle sizes and better dispersibility in water than those prepared via conventional methods.