Biodegradable poly(p-dioxanone) (PPDO) was formed on Wang resin surface by surface-initiated ring-opening polymerization (SI-ROP). The SI-ROP of p-dioxanone (PDO) was achieved by heating a mixture of Tin(II) bis(2-ethylhexanoate) [Sn(OCt)(2)], hydroxyl functionalized Wang resin, and PDO in anhydrous toluene at 80 degrees C. The resultant polymer-grafted Wang resin (Wang-g-PPDO) was characterized by fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), optical microscopy (OM), and field-emission scanning electron microscopy (FE-SEM). The FTIR spectra of Wang-g-PPDO show peak characteristic of PPDO at 2943 cm(-1) (-C-H stretch), at 1741 cm(-1) (-C = O stretch), and 1136 cm(-1) (C-O-C stretch) indicating the formation of ester linkage between PPDO and hydroxyl terminated Wang resin. The DSC thermogram show melting peak corresponding to PPDO polymer on Wang resin surface. Thermogravimetric investigation shows increase in PPDO content on the Wang resin surface in terms of percentage of weight loss with increase in reaction time. The OM and SEM photographs clearly show the formation of PPDO polymer on the Wang resin surface without altering the spherical nature of Wang resin bead. (C) 2008 Wiley Periodicals, Inc.