| 초록 |
Poly(vinyl alcohol) (PVA)/poly(vinyl pivalate/vinyl acetate) [P(VPi/VAc)] microspheres, with a skin-core structure, were prepared through the heterogeneous surface saponification of copolymers of vinyl pivalate (VPi) and vinyl acetate(VAc). Incorporation of silver iodide complexes inside the PVA microspheres was achieved by first swelling particles in potassium iodide (KI) solution and precipitating the silver iodide complexes using a solution of silver nitrate. It is possible that radiopaque particles render to monitor the material by X-ray while getting into the vessel via catheter without resorting to angiography. Moreover, radiopacity allows the assessment of the fate of the particles in various time periods after implantation. An analysis of the structure and properties of the radiopaque PVA microspheres were performed using video micro scope (VMS), fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC). |
